Panasonic · Washing Machine

Panasonic Washing Machine H21 error code

Difficulty: Hard · Cost: $80–$200 · Duration: Requires professional service

The H21 error means your Panasonic washing machine detected that the water level inside the drum is rising abnormally, indicating a possible overflow condition. This is most commonly caused by a faulty water inlet valve that is not closing properly and allowing water to keep entering the drum. A clogged or dirty inlet valve diaphragm can also cause this. Do not use the machine until the issue is resolved as an overflowing machine can cause flooding.

Common causes

Water inlet valve is not closing properly allowing continuous water flow
Inlet valve diaphragm is dirty or clogged preventing the valve from sealing
Pressure sensor fault causing incorrect water level readings
Water inlet valve has failed completely

How to fix it

1

Turn off the water supply tap immediately
2

Unplug the machine to stop it running
3

Clean the diaphragm of the water inlet valve — remove any mineral deposits or debris from the inlet valve
4

Check that the inlet valve operates correctly after cleaning
5

If H21 returns after cleaning the valve the inlet valve needs replacing by a technician