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My potterton puma 80e will only fire when i turn the central heating on. It won't fire up when I just turn a hot tap on. So the only way to get hot water is to turn on the central heating, then once the boiler has fired, turn on a tap, and then turn the central heating off. Any ideas on...

I have a Potterton Puma 80e that won't fire up. When I set the boiler to be on, or turn on a hot water tap, the pump starts whirring, there is a fan noise and i can hear a sparking sound (although can't seem to see any sparks through the window), but the pilot light doesn't ignite and about...

My combi boiler works perfectly, but whenever the central heating is switched on the pump is constantly whirring, even when the thermostat kicks in and the heating flame goes out. I recently had to get the control board replaced as part of it burnt out, after fitting a new one the system...