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Mend Glowworm Space Saver Boiler Cylinder Thermostat

Glow worm space saver boiler problem?

I have a glow worm space saver boiler and the hot water cylinder is making noises.
The thermostat is only engaged for a short period of time before the hot water is blowing through the vent pipe into the tank in the loft and out of the over flow pipe. I've changed the thermostat and motorised zone valve, but still have the same problems - any ideas?

Phil
January 2008
GlowwormGlowworm Space SaverHeating, Home Heating SystemsBoiler Cylinder Thermostat
boiler stat faulty

9d9s9s
January 2010
It's your pump

Josh
March 2008

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