154 — Delivery/return probe control test

What does 154 mean?

An issue related to the control test of the delivery/return temperature probes has been detected. This can affect the boiler's ability to accurately measure water temperatures.

• Problem detected during a self-test of temperature probes
• Similar issues to air in the boiler circuit or pump problems (as per E109)

Click steps to track your progress.

1. 1

   Press and hold down the Reset button for 2 seconds to try clearing the fault.

2. 2

   Wait at least 5 minutes before attempting another reset if the fault reappears.

3. 3

   If the fault persists, contact an Authorised Service Centre to check the temperature probes and system circulation.