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Help! The original problem which cleared itself with no change of units has been replaced by a more annoying problem. Select CH on boiler runs system function correctly. Select HW boiler runs for a few seconds and then shuts down. Boiler will not relite, both HW and CH valves remain fully...

The micro S/W is mechanically depressed when the valve is opened. Not until the valve closes does this release the microswitch. This does not appear to be the problem

As I write the system is performing normally! How & why I have no idea Earlier this evening whilst the fault persisted I noted that at the Wiring Centre there was no Live at the room Stat terminals although the boiler was running. Which would suggest the Live had been lost from the...

Thank you for your reply. Both valves run freely IE CH closes without delay when pwr removed. Based on circuit diagrams provided the room Stat appears key in calling for heat. Should I try isolating this at the junction box and observing what happens? Can room stats fail in such away as...

I have a potterton 80e bolier and programmer single pump with HW and CH valves. Problem boiler continues to heat radiators once programme ends. temperture can only be controlled at boiler Thermostat only way to close down boiler and close CH valve is to remove power at mains. If room stat...