Your Bosch washing machine shows error F20 on the display. What the fault code means can be found by indirect signs of a problem. You notice that things fade and sit down after washing, and the walls of the washer are too hot. This indicates that the water heats up too much, the temperature does not correspond to the selected program.
Models without a screen signal an error by flashing (glowing) the speed lamps: 800-1000, 800-600.
Note! Error F20 is critical and may cause a short circuit. Therefore, do not start the Bosch machine before correcting the situation.
Let's figure out what to do in this case.
Self-troubleshooting
Now you understand what error F 20 means: there is an unplanned heating of water. At the same time, Bosch CM can stop in the middle of washing, the buttons on the panel do not respond to pressing.
The reason that the system generates an F20 error can be either a minor malfunction or a malfunction requiring repair. First, follow these steps:
- Turn off the Bosch washing machine. If the malfunction code is displayed at the end of the program, unplug the plug and remove the laundry.
- If during operation you find steam and heat emanating from the hatch, interrupt the program. Try to drain the water automatically. If it does not, then wait until the water has cooled (at least a few hours) and drain it through the filter.
After unloading, try rebooting the system. Disconnect the Bosch machine for 20 minutes, then turn it on. F20 error reset - the problem is localized.
How to fix the problem when the error code is again on the display? We will analyze the main problems and solutions.
How to repair and fix a breakdown
Restore the work of SMA Bosch and remove the error F20 will help check the elements of the washing machine.
Relay TENA
This breakdown is characteristic of Bosch electronically controlled washing machines. A thermistor (thermostat), which determines the temperature of the water, sends a signal to the control board that you need to turn off the electric heater. The relay TENA receives a signal, giving a command to turn off.
In case of “sticking” (malfunction) of the relay, the heater does not stop heating. As a result, it may burn out and a part will need to be replaced. But first of all, check the relay, if necessary, install a new element.
Temperature sensor
A thermistor (thermostat) measures the temperature of water heating. It can fail due to the formation of scale, which prevents the device from working normally. Or because of combustion. To check both options, you need to get to the sensor:
- Remove the front panel of the Bosch washing machine. This video shows in detail how to remove the front panel:
- The sensor is located inside the electric heater, and that one is at the bottom of the machine.
- Disconnect the heater connectors and the thermistor harness by depressing the latch.
- Loosen the center nut with a wrench.
- Pull out the temperature sensor.
- Installing a new part is performed in the reverse order. The video will help:
Electronic module or programmer
Since the module does not give a signal to turn off the heater, overheating can occur at 10 °, 20 ° and even 30 ° C. Therefore, you need to check the control board, ring all the elements and connectors with a multimeter.
Do not forget to inspect the wiring between the module and the heater. The signal may not be transmitted due to a wire break.
If it is in your power - repair the module. If the item is completely defective, it must be replaced.