How to change the tachogenerator in a washing machine

The tachogenerator is a small and inconspicuous part, but very important. It monitors how many revolutions per minute the washing machine engine makes and transmits information about this to the control module. If something is wrong with the element, the machine will refuse to wash and display an error code. How to replace the tachogenerator in a washing machine yourself?

Where to look for a faulty part?

If your washing machine has a collector motor, the tachogenerator will be located on the rotating shaft of the motor. To get to the motor, you need to remove the fasteners from the back cover of the CM, pry it off with a screwdriver and remove it, and then remove the drive belt. Naturally, before starting work, you need to disconnect the unit from all communications.

The tachogenerator looks like a metal ring with two wires on the engine shaft. Sometimes, in order to dismantle the tachogenerator, you have to remove the engine itself. How to proceed?

• We remove all engine wiring.
• We unscrew the screws holding the motor.
• We move the motor body back so that it jumps off the guides. After that, it will be right in our hands.

Keep in mind that the engine is quite heavy and can easily be dropped when removed.

Test and change the part?

After the part is dismantled, you need to carefully inspect it and the wiring. If you see that some fastening is not securely held, it should be tightened immediately. All clamps and contacts should be intact. What to do if no noticeable damage is found? Then you need to test the tachogenerator. There are two ways to do this.

First method:

• Take a multimeter and set it to measure Ohms,
• Apply the probes to the tachogenerator contacts,
• Normally, the sensor resistance should be 60 Ohm.

Second way:

• Set the multimeter to measure volts,
• Connect the probes to the contacts,
• Use your other hand to rev up the engine,
• If the number 0.2 appears on the display, then the sensor is ok.

Replacing a damaged part is easy. To do this, completely remove the wiring and the element cover, which is secured with a regular latch. Unscrew the fasteners, remove the old tachogenerator and install a new one in its place.

Error codes indicating the tachogenerator

Sometimes, technicians diagnose a tachogenerator failure even before inspection. There is no magic or professional trickery here, they simply correctly interpret the error code displayed on the display. Error codes for the same phenomenon may differ for different washing machines. Let's figure out how different models of washing machines signal problems with the tachogenerator.

• Whirlpool – code F06;
• Indesit – code F02;
• Kandy – codes E7 E8 or E9;
• Samsung – code 3E;
• LG – code SE;
• Bosch - code F42;
• Atlant - code F9;
• Combustion – code F4;
• Beko – code H6;
• Mile - code F53.

Do not rush to rely entirely on the error code. In some models, the same combination can have two or even three meanings. However, if you suspect the tachometer, you will at least know which element to test first. The ability to perform diagnostics yourself already saves the user's time and energy, not to mention self-repair.