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12 months ago approx. https://www.amazon.co.uk/Perfect-Prime-TL0005-Temperature-K-Type-Thermocouple/dp/B010UWR7Z8/ref=pd_sim_60_4?_encoding=UTF8&psc=1&refRID=PBJAMVY322SCNCRT9JYK would this do the job?

Not really, that's why I'm trying to track down the fault ;) I've ordered an IR gun so that I can check this sort of stuff and anything else around the house.

Normally no; I left the heating on all night then they were too hot to touch this morning and the gauge on the boiler now reads 90c

Hi Tony, The rad temperature knob on the boiler is max (9) What is the flow and return temperature at the boiler? Using an old office wall type thermometer with the bulb touching near the Service cocks, I get 102 f/38 c on the Flow and 74 f/23 c Return. Can I assume from the above that the...

Vaillant thermocompact 142Eh (I know it is old) during this cold weather cannot heat my house enough. Any ideas as to why. The boiler was checked a while ago... cleaned/gas pressure tested/flame checked for low startup then full flame etc. Temp gauge says 70 c during this cold weather but it...