Check, repair and replacement of Bosch dishwasher heater - Setafi

If the dishwasher thermometer does not show the desired temperature (for example, 40 or 50 degrees), you will need to repair the Bosch dishwasher heater. Make sure you check with a multimeter first. How to correctly identify the symptoms of a malfunction and eliminate them is described in this material.

How to check the heater and temperature sensor

Replacing the heating element in the dishwasher is possible only after proper diagnosis. Moreover, you need to check not only the heating element itself, but also the sensor that determines the temperature. This device has several names:

• temperature sensor (classic version);
• thermistor (same as temperature sensor);
• thermistor (a kind of sensor, used mainly in modern devices).

The main sign, clearly indicating that a replacement of the heating element in a Bosch dishwasher is needed, is associated with a thermometer. If the readings on the device do not change during the operation of the device, that is, the temperature does not actually increase, this clearly indicates a failure.

However, this may not be enough, so it is important to more accurately understand how to check the dishwasher heater. This requires the following tools:

• a set of screwdrivers (regular and curly);
• multimeter;
• awl;
• pliers.

Disconnect the device from the mains, close the tap, dismantle the drain hose and proceed as follows:

1. Pull the unit out and turn it upside down.
2. If the machine is a free-standing type, remove the panel from the back, and if it is built-in, then from the side.
3. To find the heating element for the dishwasher, you will need to dismantle the drain pipe by disconnecting it from the block where the heating element is located.
4. Then the panel is pulled towards itself and the heating element is inspected. It is not necessary to immediately set yourself the task of how to change the heating element in the Bosch dishwasher, since it may turn out to be quite serviceable. First, it should be checked, and then a decision should be made.
5. Now you need to calculate the normal resistance. To do this, divide 48400 by its power (indicated in the description in the instructions). For example, if the power is 2000 watts, the result will be 48400/2000 = 24.0 ohms. This is the normal resistance value for this device.
6. Set up the multimeter, apply probes to the contacts (pins) of the part and take a measurement. If it corresponds to the calculated one, the dishwasher does not need to be replaced. If there is a strong deviation, for example, 1 or infinity, the element is definitely broken - it needs to be replaced (repair is impossible).
7. Next, it is recommended to check whether there is current leakage or not. To do this, turn on the buzzer function on the multimeter and apply the probes to the ground terminal, as well as to the power contact. No signal is considered normal. If the case is with a breakdown, the multimeter will start beeping. In this case, it will definitely be necessary to repair the heating element of the Bosch dishwasher, that is, to replace the part.
8. Then they check the insulation resistance, for which they turn on the megohmmeter function. Set in the settings 500 and hook the clip in the form of a crocodile onto the body of the unit. The probe is placed on any contact of the heating element. Normally, 2 MΩ or more should appear on the screen.
9. Checking the dishwasher heating element also involves diagnosing a temperature sensor. To do this, the multimeter is switched to the resistance measurement mode and a container with boiling water is prepared. First, the measurement is carried out in the usual way, and then the temperature sensor is placed in boiling water and readings are taken again. If it has increased noticeably, then the device is working normally.

Step by step replacement instructions

If measurements show that the heater or temperature sensor has broken, you will need to replace the heating element in the Bosch dishwasher. Before this, it is necessary to estimate the cost of a new device. The fact is that the spare part is quite expensive, often up to 10,000 rubles. If the unit is already old, it would be more expedient to sell it for spare parts and purchase a new device.

But if it is decided to replace the heating element for the Bosch dishwasher, they act as follows:

1. Turn off the device, and also disconnect all communications (hoses), having previously closed the hose.
2. Remove all dishes, as well as baskets, trays and other built-in elements in the unit chamber.
3. The next step of the instruction on how to change the heating element in the dishwasher is connected with the removal of the rocker arm (impeller). Thanks to this, free access to the necessary details will appear.
4. In order for the replacement of the heating element on the Bosch dishwasher to be successful, the drain filter is unscrewed. There will probably be liquid left - it must be drained into a container prepared in advance. The filter is unscrewed carefully, as it is easy to break.
5. Next, turn the unit upside down and remove the back panel, as well as the bottom itself.
6. Remove all wiring elements, dismantle the pump for draining. Now it’s clear how to replace the heating element in the dishwasher. remove the clamp that secures it to the body.
7. Unscrew each fastening of the heating element and install a new one. Next, collect all the details, moving in reverse order.

It is enough to simply determine where the heating element is located in the dishwasher. This element can be found at the bottom, next to the engine and pump. The temperature sensor is also located here, the malfunction of which can also lead to breakage.

Every detail needs to be checked first. Moreover, it will not be possible to determine the malfunction by the error code, because even in the event of a violation, the dishwasher does not issue any message. After measurements, the part is changed as described above. But if there is no skill, it is better not to take risks and contact the service center.