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I have a Potterton Puma 100 that I have had no end of trouble with since I moved in. Since almost my first week in this house I have had a low system pressure warning light on the boiler. once I connect up the filling loop and restore pressure everything is fine, for about 1 month. It has got...

I have a Potterton Puma 100 gas boilerl, last night i noticed it was quite cold in the house, I checked to see if the timer had switched off, the timer was still on but there was no heating. The Pilot light is on, when I turn the hot water tap the boiler fires up and I get hot water but I don't...