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how can l fix my glowworm spacesaver boiler 50 mark 11?

pilot light goes out after going through the lighting process and replacing the thermocoupler with new one, on release of pilot button
barry, July 2010
Assuming the thermocouple has been fitted correctly and the pilot is good, it's either the overheat interruptor or the gas valve, most likely to be the o/h stat

Carefree, July 2010
link Click here to see other fixes for Glowworm.