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Errors


Boiler type Phoenix PH-76-50

Error code F31

Cause:

Dual Temperature Sensor B Error

Solution:

- Manually reset the water heater.
- Observe water heater operation. If fault code occurs again:
- Check the Dual Temperature Sensor. Ensure it is properly wired to the control, and that there are no breaks, cuts, or other visible issues with the sensor wire.
- Use an ohmmeter to check resistance on Sensor B of the Dual Temperature Sensor.
- Replace Dual Temperature Sensor if Sensor B fails the resistance test.