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The 3 port wa an error on my part, I have two 2 Port valves. The Boiler is quite old but have been told it was good in its day. Its a Potterton NETAHEAT ELECTRONIC.

Changing the moterised valve did not work. I have also tried turning down the room stat and the water stat (on the tank in airing cupboard). As soon as the water in the boiler cools down sufficiently it bursts back into life even with the water and heating in the off positions. My Clock/timer is...

No the radiators do not get hot. I noticed it came on today at lunchtime the clock had switched the water and heating off at 9am. When I checked at 10am the boiler was off so something caused it to switch on again at lunchtime even though the control timer was off. Assuming it was the zone...

Thanks that sounds hopeful. By moterised valve are you referring to the 3-way valve in the loft? I had one of these seize a few years ago and could only get hot water and no heating. Are you saying that a similar thing may have happened and the boiler just stays running. I believe there are...

I have noticed several times now that my gas boiler is fully fired up and running hours after the central heating and water clock should have turned off. We have an electronic control timer and on inspection see that nothing should be on, yet the boiler is still running. I am not aware of any...