Cause of error code Flue temp high

The stack temperature has exceeded the

set parameters for the boiler.

Solution for error code Flue temp high

- Inspect the heat exchanger.
- Inspect the flue sensor and associated wiring. Measure the resistance of the flue sensor. Replace the sensor if necessary.
- Verify that the vent/air intake pipes are properly installed and that there are no obstructions.
- Replace main control board.