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Since I married the Room Stat times to the Programmer the CH valve seems to have been working ok and shutting off the pump as it should. The overrun only seemed to happen at night and only twice. Looking at an old 2 port valve I replaced with the present ones in 2002 the lever from the...

Thanks I will give that a go.

kbdiy. To reply to your 2nd post, yes I think the CH valve is faulty as you don't hear the same sounds as the DHW or the slight resistance. This will mean a whole new body I would assume with a partial drain down. I have changed them before when I changed the boiler, so it is not a problem...

The motorised valve opens by itself when thermostat calls for heat, closes when up to temperature but pump still runs if thermostat is turned off. Could the motor drive have sheared from the valve stem that is in the open position, yet still show the right positions on the open/close valve...

Thank you kbdiy. I have 2 two port valves. This is the 2nd time it has happened and I thought it was a blocked pump first time, so checked the pump, but clear. Will try operating CH valve manually to clear blockage if that will do it.

I have a fully pumped open vented Ideal Classic boiler. ACL Lifestyle timeswitch LP241. Landis & Gyr PID programmable room stat. I control DHW on the ACL and CH on the Landis & Gyr (with the ACL set to 24 hours on) and run like this for last 13 years or so without problems. After the Heating...