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Mend Glow-worm Optimax HE Plus Boiler Pressure Heating

Optimax he plus boiler showing F37?

Tried loosening both black valves, no hissing or system filling, pressure gauge reading 1.5. Not sure what else to try

R Clark
December 2014
Glow-wormGlow-worm Optimax HE PlusHeating, Home Heating SystemsBoiler Pressure Heating

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Mend repair fix Glow-worm Optimax HE Plus home heating systems