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Hi Thanks for the replies, the mains light is on and the red light on the electronics board also lights when a hot tap is opened. All the voltages are correct as referred to in the fault finding chart and the relays open and close when boiler is switched from standby to on. But the fan will...

Hi, wonder if anyone can help I have a Potterton Puma 100e which is a few years old and has always given problems. My latest is that I cant obtain any hot water or central heating. When a hot tap is opened a restricted flow is heard through the boiler but isn't followed by the boiler firing. I...