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Hi Just to say thankyou to everyone for your help/suggestions. I bought a new cylinder thermostat which came this morning - on the assumption that the wiring would be identical (which it was) & have now fitted this. I've just tried turning the HW on & then off at the programmer & it...

Agile How do I get the cover off the Potterton PTT2. I switched the electric (ring mains - up & downstairs & water heating) off in the fusebox, removed screw underneath Potterton - front bit lifts up partially, but can't see how to get the cover off.

Hello Spraggo I haven't checked the actuator spindle yet for movement, but looking on the plumbing.com Potteron Ptt2 picture & info on the web address you put in for John - could there be a problem with the Potterton cylinder stat misfunctioning eg the booster button getting stuck. Would...

I meant to say green light for temperature not reached

The orange booster light & the green light for temperature reached start flashing & it sounds like a drill/phone ringing. It should go off & not be on once the Potterton EP6000 electronic programmer switches HW off, but it's not doing this. At the moment I've switched everything off as it was...

Help. My Potterton PTT2 cylinder thermostat control seems to work ok to start with & is ok when HW on programmer is on, but starts making a noisy drilling/ringing sound (& orange & green lights on it start flashing) when it makes the noise. It does this when the central heating programmer...