Troubleshooting Electrolux geyser: diagnosis of popular breakdowns and methods of elimination

Geysers from Electrolux are in demand all over the world, but even the highest quality equipment has to be repaired sooner or later. Most often, troubleshooting an Electrolux geyser can be done even by those who have no experience in repairs.

It wouldn’t be bad to fix the column yourself and save on calling a repairman, wouldn’t it? But how to diagnose the cause of the breakdown and what to do next? We will talk about all this in this publication - we will look at the popular malfunctions of the Electrolux brand gas water heater, the procedure for determining the cause and methods for restoring performance. For clarity, we will provide the article with photos and thematic videos.

Probable errors and causes of occurrence

This article contains all possible malfunctions and options for eliminating them, as well as error codes for all Ariston boilers, including models EGIS, CLASS, BS II, as well as for gas water heaters FAST EVO, Marco Polo.
All information is read in the following order: code - name - possible malfunction. If you have any additional questions, please leave them in the comments to this article. The content of the article

• Heating circuit
• Error code 101 - Primary heat exchanger overheating
• Error Code 102 - Fluid Pressure Sensor Error
• Error code 103 - Insufficient circulation or no coolant
• Error code 104 - Insufficient circulation or no coolant
• Error code 105 - Circulation or presence of water
• Error code 106 - Circulation or presence of water
• Error code 107 - Circulation or presence of water
• Error code 108 - Low pressure in the heating circuit
• Error code 109 - Validity test failed
• Error code 110 - Heating supply line sensor (NTC 1) open or short circuited
• Error code 111 - for Ariston boilers with the “Semi-automatic make-up” function. The problem is pressure/coolant.
• Error code 112 - Heating return line sensor (NTC2) open short circuit
• Error code 114 - Outdoor temperature sensor error
• Error code 116 - Safety thermostat error
• Hot water supply circuit (DHW)
• Error code 201 - DHW temperature sensor error
• Error code 202 - Error in the lower temperature sensor of the boiler (solar heating system).
• Error code 203 - Boiler temperature sensor error (for boilers with a boiler)
• Error code 204 - Solar temperature sensor error
• Error code 205 - Sensor at the DHW inlet (solar)
• Error code 207 - Solar heating circuit error
• Error code 208 - Antifreeze function error
• Error code 209 - Water overheating
• Ariston boiler electronic board
• Error Code 301 - Display Board Program Error
• Error Code 302 - Communication error between main board and display board
• Error Code 303 - Main Board Failure
• Error Code 304 - More than 5 resets performed within 15 minutes
• Error code 305, 306, 307 - ECU operation error
• Errors - Ignition and flame control
• Error code 501 - Error: No flame found at ignition
• Error Code 502 - Flame detected with gas valve closed
• Error code 5P1 - Burner ignition error
• Error code 5P2 - Re-ignition error
• Error code 5P3 - Failed to ignite the burner on the second try
• Air supply/Smoke exhaust
• Error Code 601 - Traction Sensor Error (Open Chamber Models Only)
• Error code 602 - Smoke removal thermostat error (only in boilers with an open combustion chamber type VMC)
• Error Code 604 - Fan Error/Hall Sensor Failure
• Error code 607 - Pneumatic relay error
• Error code 6P1 - Pneumatic relay error
• Temperature zones
• Error code 701 - Supply temperature sensor error (zone 2)
• Error code 702 - Return temperature sensor error (zone 2)
• Error code 703 - Supply temperature sensor error (zone 3)
• Error code 704 - Return temperature sensor error (zone 3)
• Error code 705 - Water temperature sensor error
• Error code 706 - Overheating error in zone 2
• Error code 707 - Overheating error in zone 3
• Error codes for geysers Ariston Marco Polo
• Error code E1 - Ignition error
• Error Code E2 - Flame Error
• Error code E3 - Coolant error
• Error code E4 - Temperature sensor error
• Error code E5 - Shutdown soon
• Error Code E6 - Flame Error
• Error Code E7 - Fan Error
• Error Code E8 - Communication Error
• Error Code E9 - Main Board Error
• Error codes for geysers Arison FAST EVO
• Error - 1 flash. Incorrect installation of microswitches
• Error - 2 flashes. Malfunction of the DHW temperature sensor
• Error - 3 flashes. No flame
• Error codes for gas wall-mounted boilers Ariston BS II
• Error - the red LED for blocking the operation of the column and the temperature LED are not blinking 90
• Error - yellow LED flashes for anomalies in the smoke removal system and temperature LEDs for 40 and 50
• Error - the red LED for blocking the operation of the column and the temperature LED for 40 and 50 do not blink
• Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing at 60 and 70
• Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing at 70 and 80
• Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 70
• Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 80
• Error - the red LED for blocking the operation of the column and the temperature LED are not blinking 80
• Error - the red LED for blocking the operation of the column does not blink
• Error - yellow LED flashes for anomalies in the smoke removal system and temperature LED 50, 60, 70
• Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 60, 70, 80
• Error - yellow LED does not blink for anomalies in the smoke removal system

If you are not 100% sure what exactly the problem is and that you can solve it, immediately contact the service center to diagnose and fix the problem.

Popular models

The Italian corporation is known throughout the world as a manufacturer of advanced, reliable, high-quality equipment. Brand devices are popular in Russia, CIS countries and the EU. Let's look at the most popular models.

Electrolux GWH 265 ERN Nano Plus

Perhaps the most popular water heater is Electrolux. It has a capacity of about 10 liters per minute, the power is around 20 kW. The ignition is convenient, electronic - just open the mixer, and the device will start working on its own. Monitor the condition of the batteries so that they do not run out at the most inopportune moment.

The body is ergonomic, compact, and has an attractive appearance. The heat exchanger is made of copper, the burner is steel. Oxygen Free technology was used to produce the radiator, so the absence of lead and oxygen in the system is guaranteed. There is a built-in flame modulator that regulates the operating temperature taking into account the pressure inside the line.

The gas water heater protection system includes:

• Temperature limiter;
• Overheat sensor;
• Charge controller;
• The display shows a full set of parameters.

The mass of the unit is 8 kg, the cost is from 5 thousand rubles. Reviews about the model are good; users write that this is one of the best options in its category. The adjustment is convenient, the display panel works without failures. The pressure in the system is reduced, the main thing is to make the settings correctly. Temperature regulators are quite sensitive; with a sharp drop in pressure, it can be difficult to set the ideal parameters. Possible popping noises when igniting.

GWH 285 ERN NanoPro

Electrolux GWH 285 ERN NanoPro is a more premium option. The gas flow heater is equipped with a steel burner and a copper heat exchanger. There is an option to maintain optimal heating temperatures, the adjustment is smooth. Power regulators and a heating operating temperature controller are located directly on the panel. There you will also find the on and off key. The indicator is located in a visible place and promptly alerts you to problems.

Good to know. The model features advanced Intelligent control technology. It is she who is responsible for stable operating parameters.

The column has an automatic ignition function, an option for monitoring gas supply volumes, and indicating the switching mode. There is no remote control, which not all users like. There is also no heating indication. The combustion chamber is open, the mass of the unit is slightly less than 9 kg, the maximum heating is 75 degrees. Consumers note the following positive characteristics of the model:

• Simple controls;
• Possibility of full control over the operation of the device;
• Electronic ignition;
• Stainless steel burner;
• Large nozzle;
• Presence of microswitch.

The price corresponds to the category.

GWH 350 RN

An advanced model, the cost of which is around 18 thousand rubles. The flow heater is equipped with a steel burner, and the exchanger is also copper.

Start-up is quick and easy thanks to the piezo ignition. There are two operating modes:

• Economical;
• Productive.

There are switches on the case, by adjusting which you can set operating parameters. Visual control of the flame is simplified thanks to the viewing window. The rated power indicator is 24 kW. There is no control panel or automatic ignition, but there is gas control and a power indicator.

There is no interactive panel.

Heating circuit

Does the scoreboard show an error? Perhaps the problem lies in a malfunction of the heating circuit. Take a look at the list below, find the error code and get the system working.

Error code 101 - Primary heat exchanger overheating

The overheating thermostat is triggered/faulty or the NTC sensor temperature is above 102C:

1. Check/adjust the maximum pressure of the gas valve.
2. Clean/replace the heating circuit filter.
3. Scale in the heat exchanger. Cleaning/replacing the heat exchanger.
4. Check the circulation pump for damage.

Error Code 102 - Fluid Pressure Sensor Error

Short circuit or break in the electrical circuit of the coolant pressure sensor.

Error code 103 - Insufficient circulation or no coolant

Increase in supply temperature by more than 7 C/sec (repeated three times):

1. Check the coolant pressure in the heating circuit, or remove air from the Ariston boiler.
2. Cleaning or replacing the heating circuit filter.
3. Check the circulation pump for damage.

Error code 104 - Insufficient circulation or no coolant

Increase in supply or return temperature more than 20 C/sec:

1. Check the coolant pressure in the heating circuit, or remove air from the Ariston boiler.
2. Cleaning or replacing the heating circuit filter.
3. Check the circulation pump for damage.

Error code 105 - Circulation or presence of water

Supply temperature – return temperature is greater than 55C (three times).

Error code 106 - Circulation or presence of water

The return temperature is higher than the supply temperature +10°C (repeat 3 times).

Error code 107 - Circulation or presence of water

The return temperature is higher than the supply temperature +30°C.

Error code 108 - Low pressure in the heating circuit

Recommended recharge:

1. Check the coolant pressure in the heating circuit, or remove air from the boiler.
2. Check the wiring to the pressure switch. Check or replace the pressure switch.
3. Check the heating circuit and boiler for leaks.
4. Cleaning or replacing the heating circuit filter.
5. Check the circulation pump for damage.

Error code 109 - Validity test failed

1. The temperature of the return line during the startup of the Ariston boiler is 5 C higher than the temperature in the supply line of the heating system.
2. Make sure the NTC 1 and NTC 2 sensors have contact with the heating pipes.
3. Check the coolant pressure in the heating circuit.
4. Check the wiring to the pressure switch. Replace the pressure switch.

Error code 110 - Heating supply line sensor (NTC 1) open or short circuited

1. Check the contacts of the NTC 1 temperature sensor.
2. Replace NTC 1 temperature sensor.

Error code 111 - for Ariston boilers with the “Semi-automatic make-up” function. The problem is pressure/coolant.

Low pressure or lack of coolant (P greater than P min.).

Error code 112 - Heating return line sensor (NTC2) open short circuit

1. Check the contacts of the NTC 2 temperature sensor.
2. Replace NTC 2 temperature sensor.

Error code 114 - Outdoor temperature sensor error

Short circuit or open circuit in the electrical circuit of the outdoor temperature sensor.

Error code 116 - Safety thermostat error

The safety thermostat for the low-temperature underfloor heating system has switched on.

Why Electrolux

The Electrolux water heater is one of the best solutions available on the market today. The choice can be made based on your requirements and budget. The manufacturer has simple, but reliable, productive models. If you need to purchase a high-quality unit and save money, just choose a device with a minimum set of required functions.

All the advantages of brand gas water heaters:

• Safety;
• Cost-effective;
• Attractive design;
• Large selection of additional functions;
• Availability of security and control systems;
• Durability.

In the public domain you can find reviews of different models, look at prices, and compare the characteristics of certain modifications. There are also enough Electrolux services, so there are no problems with maintenance and repairs.

Hot water supply circuit (DHW)

Is everything OK with the heating circuit, but there is no fault code shown on the display in the list above? Then it is quite possible that the problem is in the DHW circuit.

Error code 201 - DHW temperature sensor error

Short circuit or open circuit in the electrical circuit of the DHW temperature sensor (NTCs).

Error code 202 - Error in the lower temperature sensor of the boiler (solar heating system).

Short circuit or open circuit in the electrical circuit of the lower temperature sensor of the boiler.

Error code 203 - Boiler temperature sensor error (for boilers with a boiler)

Short circuit or break in the electrical circuit of the boiler temperature sensor (for boilers with a boiler).

Error code 204 - Solar temperature sensor error

Short circuit or open circuit in the electrical circuit of the solar collector temperature sensor.

Error code 205 - Sensor at the DHW inlet (solar)

Open circuit or short circuit.

Error code 207 - Solar heating circuit error

Overheating in the heating circuit of the solar collector (solar heating system).

Error code 208 - Antifreeze function error

Low temperature in the solar circuit (frost protection).

Error code 209 - Water overheating

Overheating of sanitary water in the boiler.

Owner reviews

Model SUPERLUX DGI 10L, Ivan, Astrakhan: “This is an easy-to-use and simple device. When servicing one mixer, the column works fine, but when connecting a second one, the water cools down. Spare parts are very expensive, so if there is a serious breakdown, it’s easier to buy a new device.”

Model SGA 100, Svetlana, Kholmogory: “The heater operates very quietly and does not create any noise. The water arrives at an even temperature, with absolutely no changes. With the installation of this unit, it is easy to forget that the house does not have a central supply of hot water. The downside is the additional costs: for installation and installation we had to spend an amount equal to the cost of the boiler.”

Important! The main advantage of Ariston columns is the stably maintained water temperature.

Owners of this equipment say that it is worth buying such units, but it is better to opt for a more expensive model. In this case, the risk of serious damage is much less.

Ariston boiler electronic board

If everything is in order with the heating and water supply circuits, then an error in the electronic display board of the Ariston boiler is possible.

Error Code 301 - Display Board Program Error

1. There is no contact between the main board and the display board.
2. Check that the EEPROM key is installed correctly on the main board.
3. Check contacts. If necessary, replace the display board.

Error Code 302 - Communication error between main board and display board

1. There is no contact between the main board and the display board.
2. Check contacts. If necessary, replace the display board.

Error Code 303 - Main Board Failure

1. Poor contact between main board and control board.
2. Check if the main board is working properly.

Error Code 304 - More than 5 resets performed within 15 minutes

Switch off and start the boiler using the ON/OFF button.

Error code 305, 306, 307 - ECU operation error

Internal error in ECU operation.

About company

Ariston is an Italian brand that has been supplying Europe with gas equipment for hundreds of years. The company's products are famous for their quality; they offer a wide variety of household appliances - from dishwashers to water heaters. The location of the headquarters is Fabriano. After rebranding in 2005, the company's name changed to Indesit Company. This concern, in addition to Ariston, owns the brands Hotpoint, Indesit and Scholtes. Today Ariston ranks third in the global ranking of sales of household appliances.

Errors - Ignition and flame control

Perhaps the problem is in the flame, the ignition itself and control. Here are the errors indicating this malfunction.

Error code 501 - Error: No flame found at ignition

1. There is no gas.
2. There is no contact or grounding is not used. The voltage between neutral and ground is more than 10 V AC.
3. Malfunction of the ionization electrode. Check the electrical contact and continuity of the circuit from the ionization electrode to the main board.
4. Check or adjust the power of smooth ignition.
5. Check the main board for damage.

Error Code 502 - Flame detected with gas valve closed

1. Check or replace the ionization electrode.
2. Moisture has entered the ionization electrode. Dry and protect the boiler from moisture from water vapor.
3. Check or replace the gas valve.
4. Check the power supply characteristics and the presence of a ground loop.
5. Check the main board for damage.

Error code 5P1 - Burner ignition error

Failed to ignite the burner on the first try:

1. Check the ionization electrode and its electrical circuit.
2. Check the gas pressure at the lowest and highest power.
3. Check the smooth ignition adjustment and (if necessary) increase it.
4. Check the supply air system for combustion/removal of combustion products.

Error code 5P2 - Re-ignition error

The second attempt at ignition was unsuccessful.

Error code 5P3 - Failed to ignite the burner on the second try

1. Check the combustion products exhaust system.
2. Check the gas pressure at the lowest and highest power.

Subtleties of operation

Any Ariston model comes with an instruction manual. The manual explains in detail and clearly the rules for using the unit, safety rules during operation and much more. If you follow the instructions exactly, the service life of the device will be longer, and the likelihood of life-threatening circumstances and malfunctions will be less. In addition to important points about how to turn on and light the column, how to change the temperature, where to install the battery and more, the instructions provide recommendations and rules for the safe use of the device.

• The column can only be mounted on the wall vertically. It is necessary to calculate in advance whether the wall will support the same loads. Plus, the wall should not be subject to vibration.
• It is not allowed to place the speaker near heat sources.
• If you plan to hide the speaker in a closet, you need to remember about the high temperature of the equipment. The material for the cabinet must be fireproof. Moreover, the cabinet should not be sewn at the top to ensure adequate air flow.
• It is not allowed to leave foreign objects on the pump.
• Any work (cleaning or repair) can only be carried out after turning off the device from all power sources: gas, water, electricity.
• Having detected foreign odors emanating from the water heating column, you need to very quickly turn it off from the electrical network.
• The room in which the equipment is supposed to operate must meet the prescribed standards and regulations.
• The use of the column is not allowed if the chimney is faulty or clogged.
• Equipment operation is not allowed if the combustion products controller is faulty.

Air supply/Smoke exhaust

If the air supply is disrupted or the exhaust of flue gases is difficult, this can also cause an error code to appear on the Ariston boiler display.

Error Code 601 - Traction Sensor Error (Open Chamber Models Only)

Triggering of the traction sensor.

Error code 602 - Smoke removal thermostat error (only in boilers with an open combustion chamber type VMC)

The smoke control thermostat has tripped.

Error Code 604 - Fan Error/Hall Sensor Failure

Fan operation at low speed (less than 1775 rpm - 100 rpm) or Hall sensor malfunction.

Error code 607 - Pneumatic relay error

The air relay is turned on before the fan starts.

Error code 6P1 - Pneumatic relay error

Pneumatic relay response delay.

Temperature zones

It is also necessary to monitor temperature zones. If the display shows errors with codes 701-707, then this is probably overheating or a malfunction of the temperature sensor on one of the circuits.

Error code 701 - Supply temperature sensor error (zone 2)

Short circuit or open circuit in the electrical circuit of the flow temperature sensor (zone 2).

Error code 702 - Return temperature sensor error (zone 2)

Short circuit or open circuit in the electrical circuit of the return temperature sensor (zone 2).

Error code 703 - Supply temperature sensor error (zone 3)

Short circuit or open flow temperature sensor (zone 3).

Error code 704 - Return temperature sensor error (zone 3)

Short circuit or open return temperature sensor (zone 3).

Error code 705 - Water temperature sensor error

Short circuit or break in the electrical circuit of the hydraulic temperature sensor.

Error code 706 - Overheating error in zone 2

Overheating in temperature zone 2.

Error code 707 - Overheating error in zone 3

Overheating in temperature zone 3.

Essential elements

The structure of a gas water heater looks something like this.

• Water flow regulator.
• Connection to the chimney.
• Power control.
• Heat exchanger.
• Water node.
• Hood for hood.
• Switch.
• Back panel.
• Gas valve consisting of membranes.
• Ignition.
• Gas unit.

Two pipes are connected to the gas water heater. The first of them is intended for supplying gas, the second is for supplying cold water. In addition, there is a pair of burners located below, one auxiliary, one main.

Important! The design of a gas water heater can be different, depending on the ignition method - it (ignition) can be electronic, manual, or using a piezoelectric element.

Error codes for geysers Ariston Marco Polo

This list contains fault codes specifically for Ariston Marco Polo gas water heaters.

Error code E1 - Ignition error

Ignition did not occur.

Error Code E2 - Flame Error

Flame failure/chimney blockage.

Error code E3 - Coolant error

Overheating of water / heating without water.

Error code E4 - Temperature sensor error

Failure of the temperature sensor.

Error code E5 - Shutdown soon

Shutdown after 30 min.

Error Code E6 - Flame Error

There is no flame.

Error Code E7 - Fan Error

Fan failure, rotation speed outside the permissible range.

Error Code E8 - Communication Error

Communication failure.

Error Code E9 - Main Board Error

The main board is faulty.

How to repair a water heater?

The duration of operation of geysers is affected by the quality of water. For minor problems, you can handle the repairs yourself. Classic malfunctions of gas-fired water heaters:

• The device does not turn on or turns off after a short time - “symptoms” indicating that scale has accumulated in the heat exchanger. It needs to be cleaned with a special cleaner.
• It is not possible to get hot water out - the radiator has probably leaked. Another option is incorrect adjustment of the water or gas supply.
• The burner does not ignite. Check the draft - the chimney may be clogged.

Error codes for geysers Arison FAST EVO

The list of possible malfunctions specifically for the Ariston FAST EVO gas dispenser is not long.

Error - 1 flash. Incorrect installation of microswitches

Microswitches are installed incorrectly. Solution: Install the microswitches correctly.

Error - 2 flashes. Malfunction of the DHW temperature sensor

The hot water temperature sensor is faulty. Solution:

1. Check the sensor cable.
2. Check water pressure (too low).

Error - 3 flashes. No flame

No flame when igniting. Solution: Check the gas valve.

Actions with Neva

Geysers from this company have various modifications. Each has its own weaknesses.

There are often cases when users find it difficult to turn off the Neva gas water heater with index 4511

The most common causes of this problem in this model are:

1. Problems with the water block.
2. Flow indicator (micro switch) failures.
3. Low battery voltage.

The arrangement of elements in Neva 4511 looks like this:

Here the operating principle of the water and gas units is identical. That is, when water opens, the membrane of the first component bends and puts pressure on the rod of the second. The EMC opens, gas flows to the main burner.

The batteries power the control mechanism, which is responsible for ignition and other processes in the device.

The microrelay is located under the water block in a free state. When the rod of the water mechanism moves, this relay closes, and current flows from the batteries to the control system.

To solve the problem there are the following methods:

1. Repairing or cleaning the water block. It is better to trust the work to experts.
2. Replacement of microrelay.
3. Installing more powerful batteries.

Error codes for gas wall-mounted boilers Ariston BS II

On the BSII boiler panel, in the event of an Emergency Lockout or Emergency Shutdown, the corresponding combination of indicators lights up.

Error - the red LED for blocking the operation of the column and the temperature LED are not blinking 90

Blockage due to overheating.

Error - yellow LED flashes for anomalies in the smoke removal system and temperature LEDs for 40 and 50

Alert for insufficient water pressure.

Error - the red LED for blocking the operation of the column and the temperature LED for 40 and 50 do not blink

Blockage due to insufficient water pressure.

Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing at 60 and 70

Short circuit or open circuit of the temperature sensor in the heating circuit flow line.

Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing at 70 and 80

Short circuit or open circuit of the temperature sensor in the return line of the heating circuit.

Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 70

Communication failure between the column circuit and the user interface circuit.

Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 80

EEPROM failure.

Error - the red LED for blocking the operation of the column and the temperature LED are not blinking 80

Electronic circuit malfunction.

Error - the red LED for blocking the operation of the column does not blink

Blockage due to lack of automatic ignition of the burner.

Error - yellow LED flashes for anomalies in the smoke removal system and temperature LED 50, 60, 70

Flame detected with gas valve closed.

Error - the yellow LED for anomalies in the smoke removal system and the temperature LED are flashing 60, 70, 80

Flame separation.

Work principles

A thermocouple is two welded conductors. One is made of alumel and chromel. The thermocouple has one main function - supplying power to the solenoid valve.

Such a part rarely fails. At the exit from the housing there is a bottleneck equipped with a central conductor. The latter is equipped with high-quality insulation, but even it sometimes gets worn out, causing the speakers to go out.

Another problem is contact failure at the thermocouple welding points. In this case, it is impossible to restore the original characteristics. After all, the current generator passes through the same place. It is recommended to purchase a replacement for the old part.

A solenoid valve is also known as a copper wire coil. Inside this structure there are metal cylinders called a solenoid. There is a mechanical connection between this part and the shut-off valve for gas to enter the burner.

When the thermocouple heats up, a current is generated. It creates a magnetic field when passing through the coil. It is due to this that the solenoid is pulled inward. The solenoid also has a mechanical connection with the valve. Gas flows to the igniter when the valve is moved.

The thermocouple cools down if the gas does not ignite. Because of this, current production stops. The gas supply stops altogether as the solenoid itself returns to its original position.

This is how you can ensure safe operation of devices under various conditions. This is also due to the fact that problems can arise due to a simple blow of wind if the systems are not equipped with protective mechanisms.

A bimetallic plate is how a thermal fuse can be described. The plate begins to sag when the temperature where the part is installed reaches 90 degrees.

The solenoid power supply circuit is then broken. The thermal fuse is connected to the general circuit using special terminals.

It often breaks due to the fact that the design is complex and has a lot of features.