Potterton Puma 80

[beepee46]

My system is about ten years old and I have had a few probs past 6 months, however, what happens now is the pilot light goes out every time the burner is about to ignite. This happens with either CH or DHW, any ideas??

 

[ChrisR]

Does it look like the fan is blowing the pilot out? If so it's possibly dirt in pilot dept - get a corgi to service it. If things go further to the clunk when the gas valve should open, it might mean a new GV - more expensive, but only corgi will tell you.

 

[beepee46]

Thats exactly what it looks like... just as the fan goes into fast spin the pilots all over the show then gone.
I'll give it a blow down the end...

 

[beepee46]

gave it a clean and it stays on when burner flames but, hot water is fine but ch not. would an air lock cause it to go out?

 

[croydoncorgi]

Yes - if the boiler is overheating.