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I have read numerous questions and answere relating to problems with Puma boilers and as advised have replaced the DHW flow switch and microswitch. However, when turning on the hot tap the boiler still wont fire up and the pilot light goes out after about 8-10secs. Could the air flow switch be...

I'm looking for any advice on a problem with my Potterton Puma 80 boiler- it has in the last couple of months started to take a while ( at least 8-10 secs ) for it to fire up once the domestic hot water is turned on. Occassionally the pilot light also goes out after this delay in firing up ...