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nelson AD40 Commercial Dishwasher

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SUMMARY

PRODUCT IDENTIFICATION ............................................................................................................................ 3

1.1 APPLICATION, GENERAL FUNCTIONS AND INTENDED USE................................................................................3

1.2 NAME AND ADDRESS OF MANUFACTURER OR DISTRIBUTOR...........................................................................3

1.3 DECLARATION OF CONFORMITY TO PRODUCT STANDARDS .............................................................................3

1.4 DESCRIPTION OF THE APPLIANCE.......................................................................................................................4

SYMBOLS USED IN THE MANUAL ................................................................................................................... 4

SAFETY PRECAUTIONS AND INSTRUCTIONS....................................................................................................5

3.1 CORRECT INSTALLATION.....................................................................................................................................5

3.2 SAFE USE.............................................................................................................................................................6

3.3 CORRECT MAINTENANCE ...................................................................................................................................7

PRODUCT CHARACTERISTICS .........................................................................................................................8

4.1 OVERALL DIMENSIONS .......................................................................................................................................8

4.2 TECHNICAL CHARACTERISTICS............................................................................................................................9

PREPARING THE APPLIANCE FOR USE........................................................................................................... 10

5.1 POSITIONING AND INSTALLATION....................................................................................................................10

5.2 CONNECTION TO THE WATER SUPPLY .............................................................................................................11

5.3 DRAIN CONNECTION ........................................................................................................................................11

5.4 CONNECTION TO THE ELECTRICITY SUPPLY .....................................................................................................12

FIRST START-UP........................................................................................................................................... 13

6.1 FIRST START-UP ................................................................................................................................................13

6.2 PREPARING FOR USE ( IMPORTANT ) ..............................................................................................................13

6.3 USING THE WATER SOFTENER (ON MODELS WITH THIS FEATURE ONLY).......................................................13

CONTROL PANEL ......................................................................................................................................... 14

7.1 SET-UP (AUTHORISED STAFF ONLY).................................................................................................................15

7.2 MODIFIABLE PARAMETERS...............................................................................................................................16

7.3 STARTING THE PERISTALTIC PUMPS – RAPID FILLING OF DETERGENT AND RINSE AID DELIVERY CIRCUIT.....19

MALFUNCTIONS SHOWN ON THE DISPLAY (FOR THE TECHNICIAN) ............................................................... 20

INSTRUCTIONS FOR THE USER ..................................................................................................................... 22

9.1 BEFORE WASHING ............................................................................................................................................23

9.2 FIRST USE EACH DAY (TANK AND BOILER EMPTY) ...........................................................................................24

9.3 OPERATING ANOMALIES ..................................................................................................................................25

9.4 PROGRAM CHANGE..........................................................................................................................................26

CHOSING THE PROGRAM ......................................................................................................................... 27

BASKETS PROVIDED ................................................................................................................................. 28

MAINTENANCE AN CLEANING .................................................................................................................. 29

12.1 CLEANING THE FILTER DURING THE DAY..........................................................................................................30

12.2 TOTAL PUMP-OUT AT THE END OF THE DAY....................................................................................................30

12.3 RESIN REGENERATION (FOR MODELS WITH SOFTENER) .................................................................................31

12.4 TOPPING UP WITH REGENERATING SALT (FOR MODELS WITH SOFTENER) ....................................................32

12.5 ROUTINE INSPECTION OF THE SPRAY ARM (ONCE A WEEK )...........................................................................32

12.6 LENGTHY PERIODS OUT OF USE .......................................................................................................................32

TROUBLESHOOTING................................................................................................................................. 33

MALFUNCTIONS SHOWN ON THE DISPLAY (FOR THE USER)....................................................................... 35

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Name	nelson AD40 Commercial Dishwasher
Make	NELSON
Language	English
Filetype	PDF (Download)
File size	0.54 MB

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NELSON AD60 Passthrough Dishwasher

Free PDF manual for the nelson AD40 Commercial Dishwasher – with cycle guides, troubleshooting tips, and maintenance instructions 👉 View PDF online or download now and keep your dishwasher running flawlessly!

nelson AD40 Commercial Dishwasher Overview

Summary of Contents

Page 1: summary product identification application, general functions and intended use name and address of manufacturer or distributor declaration of conformity to product standards description of the appliance symbols used in the manual safety precautions and instructions correct installation safe use correct maintenance product characteristics overall dimensions technical characteristics preparing the appliance for use positioning and installation connection to the water supply drain connection connection to the electricity supply first start-up first start-up preparing for use (important) using the water softener (on models with this feature only) control panel set-up (authorised staff only) modifiable parameters starting the peristaltic pumps – rapid filling of detergent and rinse aid delivery circuit malfunctions shown on the display (for the technician) instructions for the user before washing first use each day (tank and boiler empty) operating anomalies program change choosing the program baskets provided maintenance and cleaning cleaning the filter during the day total pump-out at the end of the day resin regeneration (for models with softener) topping up with regenerating salt (for models with softener) routine inspection of the spray arm (once a week) lengthy periods out of use troubleshooting malfunctions shown on the display (for the user)
Page 2: Nelson thanks you for choosing one of its products. This manual is an integral part of the appliance. Take good care of it and keep it to hand throughout the appliance’s life cycle. It contains important information about assembly, safety, use and maintenance. In the event that the appliance is sold on, consign this manual to the new owner. Before putting the appliance into operation, read all the instructions in this manual carefully. Become familiar with the right conditions for the proper use of your professional dishwasher.
Page 3: Product identification This dishwasher is intended for professional use in the restaurant and institutional catering sector and complies with the relevant safety regulations. The dishwasher must only be used by suitably trained staff. It is designed for washing tableware and any other item for commercial catering that is stable to temperature and humidity produced by the appliance. Any other type of use is not permitted and may be dangerous. Persons whose physical, sensory or mental capabilities render them unable to use the dishwasher safely must not use it without supervision. The manufacturer is not liable for any injury or damage caused by failure to comply with the instructions given in this manual. This appliance complies with the relevant safety regulations and conforms to the requirements of directives 2006/42/EC and 2004/108/EC. The dishwasher is marked in compliance with European Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE). For information on the treatment, recovery and recycling of this product, contact the local authority or your authorized reseller. Make sure that this product is scrapped correctly to safeguard the environment and health.
Page 4: Description of the appliance includes various components such as the cover, display and control panel, front loading/unloading door, service compartment, and adjustable feet. Symbols used in the manual instruct users to read the instructions carefully and highlight important safety information. Certain symbols indicate the risk of electric shock and provide guidance for connecting external equipment. Additional symbols emphasize the importance of compliance with procedures and rules. Technical instructions are intended for qualified staff responsible for installation, commissioning, testing, and repairs. At the end of its working life, the appliance must be disposed of in accordance with relevant legislation for recovery and recycling.
Page 5: Safety precautions and instructions contain important information and must be read with care. The manufacturer does not accept responsibility for damage caused by failure to comply with the safety precautions and instructions. The dishwasher must be installed by an authorised technician. When handling and installing the dishwasher, always wear suitable personal protection equipment (PPE). Do not install a dishwasher which has been damaged during transport. If the power supply cable is damaged, do not run the dishwasher. Do not install the dishwasher in areas subject to freezing temperatures or in atmospheres with explosion risk. Electrical safety is ensured only if the dishwasher is connected to an earth conductor compliant with relevant electrical regulations. A circuit breaker and overcurrent protection device must be installed in an easily accessible position on the dishwasher's power supply line. Only use new hoses for connection to the water supply; old hoses must not be used.
Page 6: The staff assigned to use the dishwasher must be suitably trained and instructed. The appliance is not suitable for use by juveniles or persons with reduced physical, sensorial or mental capacities, or those without the necessary knowledge and experience. Do not leave the dishwasher door open. Do not sit or lean on the open door. The water inside the dishwasher is not drinkable. Do not use the dishwasher for washing or soaking foods. When using the dishwasher, remember that the plates are very hot at the end of a wash cycle. Knives and pointed kitchen equipment must be placed in the basket with their tips downwards, or horizontally. The dishwasher is only intended for use with water and detergents suitable for washing in professional dishwashers. Swallowing or inhaling detergents may cause serious injury to the nose, mouth and throat.
Page 7: Correct maintenance Do not clean the machine with a water jet machine, high-pressure or steam cleaners. Before performing any maintenance procedure on the appliance, disconnect it from the mains electricity supply. Never open the dishwasher's case. Electric shock hazard. The dishwasher may only be repaired by the authorised service organisation. Substandard repairs may cause damage or danger for the user. No alterations or changes of any kind to the appliance's electrical circuits or mechanical structure are permitted. Replace any faulty parts only with genuine spare parts. The manufacturer declines all liability for damage resulting from the use of non-genuine spare parts. The power supply cable must be replaced by the manufacturer or an authorised service centre.
Page 8: Product characteristics include overall dimensions and various components such as the lower back panel, filler hose, electricity supply cable, peristaltic hoses, and terminal for external equipotential conductor. The document also mentions the drain hose and external dispenser power cable entry point.
Page 9: Technical characteristics Electricity supply Intake water pressure Intake water temperature Max. working altitude Working ambient temperature Relative humidity Intake water hardness (models with softener) Water intake flow rate (models without rinsing pump) Noise level
Page 10: Preparing the appliance for use involves conveying the dishwasher to the installation site, removing the packaging, and checking for damage. Any damage must be reported to the transporter in writing. Packaging components should not be left within reach of children and pets due to potential dangers. All packaging materials are environment-friendly and can be disposed of at a specialist waste disposal center. Plastic components suitable for recycling are marked accordingly. Operations described in this section must be carried out by qualified staff who install and commission the dishwasher. Positioning and installation require placing the dishwasher in the chosen location and removing the protective film. The dishwasher must be leveled on its four feet to ensure stability. Compliance with relevant regulations for the installation site is necessary. Recommendations from the manufacturer of adjacent appliances should be checked if the dishwasher is installed next to another appliance. Installations not described must be approved by the manufacturer. Only professional furnishings should be used in the vicinity of the dishwasher to prevent damage.
Page 11: Connection to the water supply Check that the intake water pressure, flow rate, and temperature are as stated in the dishwasher's technical characteristics. If the dynamic pressure exceeds the limit stated in the technical characteristics, a pressure reducer must be installed. Connect the water intake hose to a connector with ¾” gas threaded fitting, inserting the filter provided. Only use new hoses for connection to the water supply. If the water supply system has been unused for a long time, run the water to flush the air and dirt from the pipes. For models with a water softener, an approved double check valve must be fitted for backflow prevention. For models without a water softener, an approved single check valve must be fitted for backflow prevention. Drain connection The dishwasher is fitted with a drain pump and can operate with drain connections on the floor or wall. Before connecting the hose, check that the diameter and height of the wall drain connection are as stated in the dishwasher's technical characteristics. The drain connection must be made in accordance with the relevant national regulations.
Page 12: Connection to the electricity supply The dishwasher must be connected to the electrical system by authorised, skilled staff, in accordance with the relevant regulations. A circuit breaker with contact gap rated for category II overvoltage and an overcurrent protection device must be installed in an easily accessible position on the dishwasher's power supply line. These devices must only serve the dishwasher and must be suitable for its rated electrical characteristics. The electrical protection devices must undergo a functional test before the dishwasher is put into operation. If the dishwasher is connected to the electrical mains by means of a plug, it must be of the same type as the power socket. Electrical safety is only ensured if the dishwasher is connected to an earth conductor compliant with the relevant electrical regulations. Do not connect the dishwasher to the electrical mains by means of adapters or extensions. Connect the appliance to the equipotential bonding system. Additional recommendation: class B all-current sensitive residual-current circuit breaker with a tripping current of 30 mA. The dishwasher is always powered up unless the master switch is turned off or the plug is disconnected.
Page 13: First start-up The electrical protection system must undergo a functional test before the appliance is put into operation. The appliance must be installed and/or inspected by qualified staff, who will start it up for the first time and provide the relevant operating instructions. Preparing for use The rinse aid dispenser is fitted on all models, the detergent dispenser only on some. If both dispensers are present, put the external detergent and rinse aid containers in place and insert the respective intake hoses into them. Whenever the type of detergent or rinse aid is changed, it is essential to flush out the peristaltic pumps. Always use only products specifically recommended for use in a professional dishwasher. Replacement of the internal tube of the detergent and rinse aid peristaltic pumps is recommended every 12 months or 15,000 wash cycles. Using the water softener The dishwasher is equipped with an automatic water softener which removes substances that cause hardness from the water. A litre of water must be poured into the tank with the salt the first time the dishwasher is used. The mixture of water and detergent must not get into the salt tank, as this would impair operation of the regeneration system.
Page 14: Control panel features include an on-off button, program selection button, and start confirm/pause button. There is a total emptying button for the tank and boiler. Additional function selection is available. Indicator lights show mains power, dishwasher operation, and malfunctions. The pump-out in progress light and various symbols indicate the status of rinse-aid, salt, detergent, and heating elements. The instructions apply to both undercounter and hood-type dishwashers, with procedures varying by model.
Page 15: When the display control panel is switched on, the display shows the type of dishwasher, followed by the firmware version and update installed. If the dishwasher is already powered up, press the on/off button for direct display of the firmware version and update installed. During first start-up, the functions/parameters must be set or adjusted. With the tank empty, switch the appliance on; the display will show “FILL” and filling will start. Open the door/lift the hood; CLOSE will appear on the display. Press the button and hold it down for 5/7 seconds to access the main PCB setup menu. All the modifiable parameters can now be displayed, scrolling through them with the button. To confirm the value required, simply quit the menu or move on to the next parameter. Quitting the setup menu automatically requires waiting about 3 minutes without using the controls. Quitting the setup menu in manual mode involves holding the ON/OFF button until the beep sounds.
Page 16: Modifiable parameters The illustrations are purely guideline. The minimum and maximum temperatures available depend on the model. Rinsing temperature (boiler temperature) Washing temperature (tank temperature) Warning: The tank and boiler temperatures shown on the display may differ from actual temperatures. Adjusting rinse aid dispensing (optional if installed) Default: 1.2 g/l. Adjusting detergent dispensing (optional if installed) Default: 2.6 g/l. Autostart function: Set at “on” to start the cycle when the hood/door is closed.
Page 17: Regeneration frequency setup (models with softener) At first use, the salt tank has to be filled. It is subsequently sufficient simply to fill up with regenerating salt when necessary. Mains water hardness setting table With values over 60°f an external water treatment device must be used and the regeneration frequency must be set on H00. Extra rinse Rinsing is 10” longer than the standard in each washing cycle. Clean water cycle When this option is activated, the appliance pumps out all the water from the tank and then refills it with clean water at every wash cycle. Prolonged use of this option leads to higher detergent and rinse aid consumption.
Page 18: Thermostop settings determine the minimum rinsing temperature based on the boiler temperature. When set to on, the cycle duration may be slightly longer than nominal. If set to off, the minimum rinsing temperature may be lower without hot intake water. Users must ensure the correct temperatures are maintained if the thermostop is off. It is important to check the intake water temperature regularly. Refer to the troubleshooting section for issues related to washing and drying. Fast start (FST) enables quicker dishwasher operation but increases water consumption. Eco start (ECO) maintains standard time without additional water usage. The cycles performed counter tracks total cycles since installation and cannot be reset without software reprogramming. The USER program is the only customizable option for program duration.
Page 19: Service setting for after-sales service only. Entry into the technical set-up menu. Starting the peristaltic pumps for rapid filling of detergent and rinse aid delivery circuit. Perform after the parameter modification procedure. With the dishwasher powered up and the tank full, press the on/off button for a few seconds. The peristaltic pumps continue to operate until the same button is pressed again. The rinse aid and detergent symbol lights flash alternately as long as the pumps are on. The rinse aid peristaltic pump fills the circuit in about 7 minutes, while for the detergent it only takes 2 minutes. Draw only rinse aid from the jerry cans for the first 5 minutes and then also take in detergent for the last 2. To reset the message “door,” open and close the dishwasher door again.
Page 20: Malfunctions shown on the display for the technician. The dishwasher can identify several malfunctions and display them. If the problem persists after restarting the dishwasher, follow the troubleshooting steps. Tank temperature probe malfunction (Er 04) indicates a disconnected or faulty probe. Check the water supply tap, dynamic supply pressure, and cleanliness of the inlet water filter if the tank wasn't filled in the expected time. Tank water filling malfunction (Er 05) may involve leakage from the tube connected to the air trap. Check for obstructions in the drain pipe and ensure filter cleanliness. Water pump-out malfunction (Er 06) could be due to obstructions in the drain pump. Boiler does not heat up as expected (Er 23) may indicate a faulty temperature probe or motherboard relay failure. Boiler temperature probe malfunction (Er 24) suggests a disconnected or faulty probe. Boiler water filling malfunction (Er 25) may involve a faulty boiler pressure switch.
Page 21: - Leakage or unbinding of the tube can cause water to run inside the tube. - Check for wrong settings in the menu service indicated by “rP.” - Ensure cleanliness of the rinse nozzles. - A faulty boiler pressure switch may always detect the boiler as “full.” - Rinsing pump malfunction may occur if present. - Boiler emptying malfunction can happen with a full tank. - The boiler pressure switch may be wrongly detected in models without a rinsing pump. - Check settings in the service menu for the entry “rP.” - The boiler full signal applies to models without a rinsing pump. - The “rp” setting indicates operation status for models with and without rinsing pumps.
Page 22: Instructions for the user include details about the control panel and its functions. The on-off button is used to power the dishwasher. The program selection button allows users to choose different washing programs. The start confirm/pause button initiates or pauses the washing cycle. The total emptying button is for draining the tank and boiler. An additional function selection button provides extra features. Indicator lights show the status of the dishwasher, including power, operation, and malfunctions. The instructions apply to both undercounter and hood-type dishwashers, with some procedures specific to each model. Different lights indicate the dishwasher's readiness, operation, and any malfunctions. Monitoring symbols alert users to issues such as low rinse-aid, salt, or detergent levels.
Page 23: Before washing, use only detergents and rinse aids for industrial dishwashers. Do not use detergents intended for hand washing. It is recommended to use specially products developed for this dishwasher. When topping up the tanks, take care not to swap the products; this might damage the dishwasher and cause malfunctions. Do not mix different detergents; this would damage the dispenser device. Failure to comply with this recommendation leads to forfeiture of the warranty entitlement on the appliance’s water system. Industrial dishwasher detergents may cause serious irritation. Comply carefully with the instructions provided by the detergent producer on the pack. Check that the filters are in place, there is regenerating salt in the container, and the level of detergent and rinse aid in the containers. Turn on the mains water tap. Ensure the spray arms rotate and there are no foreign bodies in the dishwasher.
Page 24: First use each day (tank and boiler empty). Press and hold it down. The display shows the firmware version and update installed, then the tank and boiler temperatures. The boiler heating element symbol remains lit until heating finishes. Once the water in the boiler has been heated, filling of the tank starts. Wait for P1 - END to appear and light L2 to change from blue to green. Press the button quickly to display the tank and boiler temperatures for a short time. Close the door and the cycle starts. Select the program required by pressing. At the end of the program “END” flashes.
Page 25: Unload the dishes. When the dishwasher is closed again, the system offers the last program run. If the door is opened with the cycle in progress, “CLOSE” flashes and the program stops. After closing the door, the program start must be confirmed by pressing and holding it down for 1 second. In the event of a power blackout while the cycle is running, the program stops and restarts automatically from the beginning when the power is restored.
Page 26: Program change can be interrupted by pressing and holding a button. To change the program, press the designated button. Confirm the program start by pressing and holding a button for 1 second until the light turns blue again. During water heating in the boiler and tank, heating element symbols may appear on the display. Tank heating does not start until the boiler heating is completed. Some models have a filter presence sensor that checks if the filter is properly fitted. If the filter is not in the correct position, the word FiLTER appears on the display.
Page 27: Choosing the program allows you to scroll through available options, showing the program number and duration. The program types include various options for different types of dirt and their corresponding durations. The cycle duration is guaranteed if the water intake temperature meets the recommended levels. Operating conditions may vary for repeated cycles based on installation specifics. The beer glasses program requires a cold water supply and does not dispense rinse-aid during the final rinse. If the dishwasher is open during a power blackout, the display will indicate a specific status to prevent burns. Closing the dishwasher will resume the heating process for the water in the tank.
Page 28: Baskets provided with the dishwasher depend on the purchased model. Extra baskets can be purchased through the After-Sale Service. It is recommended to use baskets that are intact and not damaged by wear or tampering. The plastic runners of the baskets must not be removed, damaged, modified or tampered with. Place the glasses downwards. Use the dedicated basket for cutlery. Place the cutlery randomly, preferably with the handle downwards. Use caution to avoid injuries due to prongs of forks and blades of knives.
Page 29: Maintenance and cleaning instructions include the following steps: Lift the upper filter “S” to remove it. Turn the handle “M” anti-clockwise to release the central filter “C”. Lift the filter “C”, which will also release the rectangular filter “F”.
Page 30: Remove the filters and clean them to prevent large residues from falling into the sump. Clean away any limescale deposits to avoid excessive build-ups. Leave the hood or door ajar when not in use if possible. Use neutral, non-abrasive detergents that do not contain chlorine compounds for cleaning. Avoid using harsh cleaning products near the dishwasher to protect stainless steel surfaces. Clean the outside of the appliance with a damp cloth and neutral soap, rinsing and drying thoroughly. In heavy-duty conditions, clean the filter every 30-40 cycles using the “partial tank pump-out” routine. After cleaning the filter, start filling for undercounter models or wait for automatic filling for hood-type models. The dishwasher can perform an automatic cleaning cycle at the end of the day. Always pump out water before switching off the dishwasher.
Page 31: Resin regeneration is necessary for models with a softener. The frequency of the regeneration cycle depends on the number of washes and water hardness. The dishwasher indicates the need for regeneration when DO REGE appears on the display. Further wash cycles can be performed, but it is recommended to carry out regeneration as soon as possible. Once started, the regeneration cycle cannot be interrupted. Two methods for starting the regeneration cycle are available: on request or at the end of the day. Pressing the button initiates the regeneration process, indicated by REGE RUN on the display. During regeneration, L2 turns blue, and the program progress bars appear. To prepare the dishwasher for use, the FILL function must be started when it flashes. At the end of the day, pressing the button until REGE RUN appears will also start the regeneration process.
Page 32: Topping up with regenerating salt is necessary when the LED indicator lights up. Use only specific salt, not cooking sea salt. The salt container holds about 1 kg of granulated salt. The correct procedure to refill regenerating salt includes starting a tank pump-out, refilling the salt, filling the tank, restarting the pump-out, and removing salt residues to prevent corrosion. Routine inspection of the spray arms should be done weekly. This involves removing the spray arms, cleaning them under running water, and reinstalling them without using damaging tools. For lengthy periods of non-use, empty the detergent and rinse aid dispensers to prevent crystallization and pump damage. Remove intake hoses and perform wash cycles followed by a complete pump-out. Ensure the master switch is turned off, the water intake valve is closed, and leave the hood ajar until the interior is dry. When returning to service, correctly place the hoses back into their respective containers.
Page 33: Troubleshooting The dishwasher does not start due to line voltage failure. Verify electricity connection. The dishwasher filling is not over yet. Wait for the filling process to finish. If CLOSE continues to appear on the display even when the dishwasher is closed, contact the after sales service. CLOSE stays on display for models with display. Dismount and clean the spray arms. Clogged or crusted spray arms holes may require cleaning. Verify detergent type and quantity if there is a clogged filter. Ordinary maintenance service is recommended at least once a year for the correct functioning of the dosers. Poor washing results can occur from badly positioned dishes or glasses. Place them correctly. Verify the temperature displayed; if it is lower than 50°C, contact customer support. Increase the duration of the washing cycle for very dirty or partially dried loads.
Page 34: Verify that the filter of the tube placed inside the rinse aid jerrycan is not clogged. Verify the rinse aid container and if it is adequate to the type of mains water. Inappropriate rinse aid is not dispensed correctly. Verify the boiler set temperature. Low rinsing temperature may require restoring T Stop ON and/or connecting the machine to hot water. If the problem is not solved, contact the After-Sales Service. Water hardness superior to 12°dF or it contains many dissolved salts. Rinse aid unsuitable or not being delivered correctly can lead to insufficient drying. Check the container of rinse aid and whether the type is suitable for the mains water. Water hardness above 12°dF or large amounts of dissolved salts can cause stained glasses and cutlery.
Page 35: Malfunctions shown on the display (for the user) The dishwasher can show a series of malfunctions on display. After the machine has been switched off and restarted, follow the steps below. Tank temperature probe anomaly Tank water filling anomaly Check that the water supply tap is open, the dynamic supply pressure, cleanliness of the inlet water filter. Check that the filters are clean, and that the drain pipe is not bent, obstructed, narrowed. Water pump-out anomaly (water remains in the dishwasher) Excessive water level in the tank anomaly Boiler heating anomaly (does not heat)