The boiler is a Thorn EMI Apollo 30/50.I must have had at least 6 thermocouples fitted to it,the last one only lasting a fortnight.What could be the reason?
COUld be the pilot flame is too big. Cheap thermocouples - no, ALL thermocouples are unpredictable! The Boiler manufacturers' used to be better but the replacement parts are just the cheapies I think.
You can get nickel plated thermocouples from BES which are intended for LPG but should last longer on NG.
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