F.89 — No heating or hot water: Internal circulation pump blocked

What does F.89 mean?

There is no central heating or domestic hot water (DHW) heating because the internal circulation pump is blocked. This prevents water from circulating in the system.

• Internal circulation pump blocked

Click steps to track your progress.

1. 1

   Listen for any unusual noises coming from the pump, such as grinding or humming.

2. 2

   If safe to do so, follow instructions in your manual to try to unblock the pump manually (if applicable).

3. 3

   If the pump remains blocked or you are unsure, contact a qualified heating engineer to check or replace the circulation pump.