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Oilhead, I do have a room thermostat. It's a honeywell one. Not sure on the model number as it's just a dial on the wall down stairs. When you say programmer do you mean the clock and PCB on the boiler? If so it's the one that came with the boiler, which I think was fitted in about 2003...

Do you know where I might find that on the boiler please? On looking at the manual for the LS80 I don't think it has a frost stat?

Bump. Thanks.

:mrgreen: Too true Oilhead. Okay I've tested the thermistors on my multimeter and one was coming back at 12000 and one was coming back at 14000. I've swapped the 14000 one out for one that was reading just under 12000 and still the heating is coming straight on as soon as I turn the boiler on...

I'll check the thermistors later and report back. My realm is not too bad. I'm not heating engineer though but I do know this boiler pretty well.

Hello all, I was hoping someone will be able to help me please? I have a Ravenheat LS80 boiler and the Diverter was leaking. I bought a new diverter and replaced it along with the two thermistors. Once this was done I turned the boiler back on and the central heating came on and the only way...