Baxi Overheating / Temperature Control Failure

Baxi water heater runs but delivers water that is too hot, even at low temperature settings.

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

Faulty DHW NTC sensor reading too low, Stuck gas valve delivering maximum rate, PCB control fault, Incorrect sensor placement or poor thermal contact

Safety: High scald risk. Turn the temperature setting down and warn all users.

Steps:

Verify setting: Confirm the set temperature on the Baxi control panel is not at maximum.
Check sensor mounting: Ensure the DHW sensor is firmly attached to the outlet pipe or plate and not hanging loose.

Professional: A technician must test the sensor, gas valve modulation, and PCB control logic.

Hard 4/5

DHW Temperature Sensor (NTC)

Check Price on Amazon

We may earn a commission from links on this page.