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how long should a thermo couple in a glow worm central heating boiler last?

how long should a thermo couple in a glow worm central heating boiler last? Is it common for the gas valve to need replacing?
Anita, September 2009
once thermocouple replaced in boiler it should last good 2 years plus. it it need replacing less than that and flame is not too high than Gas Valve may need replacing as electromagnetic coil is weeker.

Mr K, September 2009