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Thanks David. I think there is gas going to the boiler as cooker hob is working. Guess this is not a diy job then?

I have a Potterton Puma 80 boiler. It's not been on for about 3 months as was having work done to flat. I switched it on recently and it was working fine - heating and hot water - except external thermostat was broken. This didn't seem to affect the heating or hot water. Then all of a sudden...