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11.9 Kohms but that is when stone cold.

Turning off and on always started the boiler and it was hard to predict for how long. By the time I spotted it of course it could have been cooling down for quite a while. What gave me a thought it might be the thermistor was that when i turned the boiler temperature up the problem seemed to...

I just replaced old for new so did not check the resistance. I still have the old one so will check.

It was the NTC thermistor that goes into the side of the heat exchanger.

An update. changed the thermistor last week and the problem appears to be fixed, fingers crossed as it has been milder recently and the boiler has not been working as hard. thanks to vokera technical help who said it was the main PCB and cost me £135. fortunately I figured out that their...

Hopefully someone can offer some advice. An intermittent fault occurs on my boiler whereby the boiler will not start even though the programmer and thermostats are calling for heat. I have checked all the voltages and they are correct going into the boiler. When the boiler is turned off...