My boiler stop working giving error code like D2, D4, D1, 01, 06. Loose pressure lot. If I switch of from mains for awhile it works for a while then gives Code D4. If I switch off & on straight away from boiler it start working but if I leave it for longer it turns to code D2. Then I have to switch it off from the mains. Please help to find fault. Thanks

Arvind, February 2010

I have a syntesi 25e which shows D4 but works after a reset, will sometimes show D2 . D4 is a self diagnosed pcb fault, D2 is a condensate sensor error. Boiler is still working fine though so not forking out for a new PCB.

David, May 2010

I'm currently experiencing the same issues. British Gas recently carried out a services and said everything was fine.

GrumpyG, May 2010