Display shows FLUE TEMP HIGH; burner shuts down due to excessive stack temperature.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Sooted heat exchanger, Incorrect burner setup, Blocked heat exchanger passages, Failed flue temperature sensor

Safety: High flue temperatures can indicate dangerous combustion conditions. Turn off the boiler and allow it to cool before inspection.

1. Check for soot: Look into the flue pipe connection at the Energy Kinetics boiler for signs of heavy soot or debris. Do not inhale dust or soot.
2. Inspect flue sensor: Locate the flue temperature sensor and ensure it is firmly attached and wired correctly.

Cleaning the heat exchanger and adjusting combustion must be done by a qualified technician with proper tools and instruments.

Professional Required 5/5

Flue Temperature Sensor

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