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Mend Lights Clicks Burner

my thermal coupling lights up, when the timer clicks on?

My thermal coupling lights up,when the timer clicks in,.but the back burner dos,nt ignite,...to heat the hot water. so i cant use the central heating either .when needed. many thanks if some one can help..

Brian
June 2009
Heating, Home Heating SystemsLights Clicks Burner
what kind of boiler?

Sounds like not a thermocouple but you have a automatic pilot light which ignites but no main burner???

Could be gas valve fault not opening solenoid 2 allowing gas to main burner, could just be recognition of pilot not being found so boiler does not think pilot has lit.
Does it keep clicking/ignition at pilot trying to light although its lit already????

q
June 2009

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Topic

Thermal Coupling Light - No Hot Water/Heating