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glow worm 40 50 fuelsaver overheat thermocouple will not stay on?

boiler fires up having reset the o/heat t/couple then cuts out after a period .the period before shutdown is lengthened by having boiler temp. set lowest.Has the o/heat thermocouple gone out of range,if so have you a spare ,price etc
Mr brian harrison, January 2008
Have you got TRVs on all the Radiators, if so remove on to create a bypass for the heat to pass into!

Justin, January 2008
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