Error 109 — Pre-circulation alarm (temporary fault)

What does 109 mean?

Error code 109 indicates a temporary fault related to the pre-circulation of water in the system. This can be caused by issues with the pump, restrictions in the system, or air.

• The pump is not running, seized, or sticking.
• Restrictions or blockages within the boiler or heating system.
• Disconnected wiring to the pump.
• Air trapped within the system.
• Heating supply and return sensors improperly placed or hanging in the air.

Click steps to track your progress.

1. 1

   Check the pump to ensure it is running freely and is not seized or sticking.

2. 2

   Inspect the boiler and the entire system for any potential restrictions or blockages in the pipework.

3. 3

   Verify that the wiring connected to the pump is secure and not disconnected.

4. 4

   Ensure all air has been thoroughly purged from the heating system.

5. 5

   Confirm that the heating supply and return sensors are securely clipped to the proper pipes and not left hanging.