Display shows E02, furnace stops, may be related to overtemperature or sensor error

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

Defective flow NTC, Loose sensor wiring, Control board misreading sensor, Actual overheating due to poor circulation

Safety: Turn off power. Allow the furnace to cool.

Check system circulation: Ensure all valves in the heating circuit are open and that the circulation pump is running.
Inspect flow NTC: Verify the sensor is properly mounted and its connector is secure on the control board.
Reset and monitor: After cooling, restore power and monitor the temperature readings (if available on the display). Rapid temperature rise suggests a circulation problem that needs professional attention.

Hard 4/5

Flow NTC Temperature Sensor

Check Price on Amazon

We may earn a commission from links on this page.