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Errors


Boiler type Hydra Smart RT-199

Error code Er:66

Cause:

Mixing Valve Error

Solution:

Press the Power button to clear the Error Code.
If Error happens again:

- Turn power OFF and ON at the main power switch internal to the water heater.
- Check wiring connections to mixing valve. Ensure all are secure.
- Replace mixing valve.
- If the problem persists, replace the main control.