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When the Honeywell v4073 rests in the mid position or in the A position (CH) it draws a current to hold against the spring and gets very hot. Seems to me that if Honeywell designed these valves to rest in the B position the motors wouldn't burn out so frequently.

My Potterton Promax 15HE not modulating - the burner is always at max and never modulates down. Had several engineers scratching their heads. Eventually found a guy who'd do it for a fixed price. He has changed the flow thermister and both the control and ignition pcbs but no fix yet...

I am an electrician and I am frustrated that no test point measurements are provided by boiler manufacturers to help diagnose problems. Seems a bit of a cosy arrangement that potterton and the like wont provide electrical support to non corgi registered engineers. I think most...

My potterton promax 15he is not cycling - the burner remains on for hours until eventually it locksout, I guess because it overheats. The bolier responds correctly to the room and water thermostats, and seem to respond to the various sensors in that it shuts off when they are disconnected...

My radiator system is microbore. Some radiators have Honeywell TRVs http://www.plumbworld.co.uk/honeywell-vt117e-0000-12664 These TRVs can apparently be fitted on either inlet or return pipes. 3 of my TRVs are fitted to return pipes and these radiators all fail to heat up properly and...