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Checked the other Temp Sensnor for HW, and that was hovering around 13Kohms, so nearer what it should be. Looking on www.mjtcontrols.co.uk the new heat sensor seems a bit more than a tenner! Manufacture: Potterton Manufactures Part Code: 10/18761 SuperCeded Code: G.C. Part...

Thanks ChrisR - certainly seems like the temp sensor needs replacing. I will see if I can get one ordered today. I'll let you know if this is the problem when I have it replaced. Thanks again.

I have now pressurised to 1 Bar (and a little bit). Same result, no CH working. I have measured the resistence across the temperature sensor to be 720KOhms, (seemed to fluctuate a little bit +/- 10K Ohms - probably because I had the hot water going a few minutes previous.) Does this sound...

Haven't got round to pressuring to 1 bar yet - but to answer your question; when cold, and I switch the CH to constant, I hear the (quiet) sound of the pump - but the boiler does not light at all. I am thinking there must be some kind of trip switch kicked in, as I am sceptical if the boiler...

Burner does not light during ignition attempt when switch CH on. Just noticed only have 0.5 bar pressure - would that have something to do with it???

Hello, I have an 8 year old Potterton Puma 80e - and it appears to have decided to have a problem when the CH demands hot water. I can hear the pump running, but the flame does not light to give the hot water. So I have just switched the CH switch to off, pending some assistance hopefully...