potterton 80 combi boiler Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

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Hi i have a pottereton 80 combi boiler it will run the domestic hot water but when you put the heating on it will fire up and run for 5 minutes or so then switch off and will start again but it will not keep running it has had a new PCB Modulation board fitted recently when you put the hot tap on the pump runs ?