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Thanks John but would this output not cause the boiler to light as well as run the pump. Cheers

Installed approx 5 yrs ago Worked aprox 4 weeks ago Not got a diagram Switch is in pumped position Thanks

I have a potterton ep2002 programmer running an ideal classic boiler and 2 danfoss hpa2 zone valves. Problem is that thermostats control the valves and the boiler turns on & off ok but the pump runs continuously. All lights on the programmer are as usual. Would I be right in thinking the fault...