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Mend Glow-worm 330 Heating Timer

Bt Gas glow worm 330 timer controls not working?

The timer controls are set for am and pm sections.
They start up OK for am but don't switch off until end of pm session.

Sandy
November 2016
Glow-wormGlow-worm 330Heating, Home Heating SystemsHeating Timer Glowworm
I think the time controls are external to the boiler. Check these are set to operate twice per day: On1 to Off1 then On2 to Off2. It sounds like you have them set for once per day: On1 to Off2.

It should be easy enough to find a manual for your timeswitch / programmer

Anon
November 2016

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Glow-worm 330 Timer Not Switching Off - Fix