F77 Fault — No response from condensate pump

What does F77 mean?

The boiler is not receiving a response from the condensate pump. This can mean the pump is defective, or there's an issue with the PCB if no external pump is present.

• Condensate pump defective
• No external condense pump but fault triggered (implies PCB issue)

Click steps to track your progress.

1. 1

   Check to see if you have an external condensate pump installed.

2. 2

   If an external pump is present, check to make sure it is working correctly.

3. 3

   If there is no external condensate pump, the PCB may be faulty (contact a technician).