Error 154 - Flow/Return sensor Temperature Test Failed

What does 154 mean?

This error code indicates a failure in the boiler's self-test for the flow and return temperature sensors. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor or water flow issue.

• Faulty flow or return temperature sensors
• Significant difference in flow/return temperatures due to poor circulation
• sensor wiring fault

Click steps to track your progress.

1. 1

   Press the 'R' (reset) button firmly for several seconds to attempt to clear the fault.

2. 2

   Ensure all radiator valves are open and there are no closed isolation valves in the system.

3. 3

   If the fault code reappears, contact your installer or the Baxi service division ('heateam') for assistance.