Mitsubishi Ecodan fault 10

What it means

Water in the DHW tank reheats too frequently due to significant temperature drop, often caused by water leakage, loose insulation, 3-way valve failure, or incorrect water pump speed setting.

Likely causes

1. Water leakage in the pipes that connect to the DHW tank
2. Water pump (sanitary circuit) speed setting failure

Where to start

1. Reoccurring problem with error code Displayed: Use table 10-4 'Self diagnosis and action' to identify fault and correct
2. Reoccurring problem with error code Not Displayed: Use table 10-5 'Troubleshooting by inferior phenomena' to identify fault and correct
3. Non reoccurring problem, error Logged: Check temporary causes of defects such as operation of safety devices on refrigerant/water circuit including compressor, poor wiring, electrical noise etc; re-check symptom and installation environment, refrigerant amount (split systems only), weather conditions at time of fault