Hotpoint Washing Machine Error Code 22: Motor Tachometer... | appliancefaults.com

Technical Background:

The motor control unit (MCU) relies on the tachometer signal to determine the motor's speed and position. The tachometer generates a feedback voltage proportional to the motor's RPM. If the MCU doesn't receive the correct signal, it assumes a fault and displays error code 22. The voltage path from the tachometer goes directly back to the MCU. An open or short in this path causes a failure.

Symptoms:

The washing machine displays error code 22. The motor may not start, or it may run erratically. The washer may fill with water but not agitate or spin.

Possible Causes:

Faulty tachometer on the motor.
Wiring harness issue between the motor and the control board.
Loose connection at the motor or control board.
Defective motor control unit (MCU).
Obstruction preventing motor rotation.
Incorrect motor type installed.

Solution:

1

Unplug the washing machine from the 120V AC outlet.
2

Access the motor and tachometer. This usually involves removing the rear panel using a 1/4-inch nut driver.
3

Inspect the wiring harness connecting the tachometer to the motor control unit (MCU) for any damage, breaks, or loose connections.
4

Use a multimeter to check the tachometer resistance. Consult the service manual for the correct resistance range. An open or shorted tachometer needs replacement.
5

Check the voltage at the motor control unit (MCU) connector when the motor is supposed to be running. It should be sending a low voltage signal (typically 5V DC) to the tachometer.
6

If the wiring and tachometer check out, replace the motor control unit (MCU).
7

After repairs, plug the washer back in and run a test cycle.

Safety Warning:

Always disconnect the power supply to the washing machine before attempting any repairs. High voltage is present in the control panel and motor circuit. Use proper Lock-Out/Tag-Out (LOTO) procedures.

Prevention:

Periodically inspect the wiring harness for any signs of wear or damage. Ensure the machine is not overloaded, which can strain the motor.

Expert Tip:

Some Hotpoint washers have a service mode. Entering the service mode (consult service manual for your exact model) allows you to run diagnostic tests on the motor and tachometer without water. This can isolate intermittent faults.

Frequently Asked Questions

•What is the typical resistance range for the tachometer on this motor?

Refer to the service manual for your specific Hotpoint washer model. However, a typical range is between 80-150 ohms.

•How do I access the service mode on this specific Hotpoint washing machine model?

The service mode access procedure varies depending on the model. It usually involves a specific sequence of button presses on the control panel. Consult the service manual for the exact sequence.

•If the tachometer resistance is within range, what is the next most likely cause of error code 22?

If the tachometer resistance is good, the next most likely cause is a faulty motor control unit (MCU). It could also be a wiring harness issue that is only apparent when the machine is running, or possibly a mechanical issue with the motor itself. Visually inspect the motor windings for burnt insulation.

Hotpoint Washing Machine Error Code 22: Motor Tachometer Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the tachometer on this motor?

•How do I access the service mode on this specific Hotpoint washing machine model?

•If the tachometer resistance is within range, what is the next most likely cause of error code 22?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: