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PostPosted: Thu Nov 02, 2017 12:20 pm 
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Glowworm Ultimate 100ff is not firing up when heating demands. However it will fire up if hot water is on.
Checked the central timer and room thermostat all working, pump is running and valves are open. This means that when hot water is on heating is working but if hot water is off the heating will not fire. I suspect that it is either the thermostat on the boiler or the PCB, but don't understand why it will fire up for water but not for heating.
Any ideas?


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PostPosted: Thu Nov 02, 2017 9:56 pm 
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Heating zone valve head microswitch has broken.

New head needed, as long as your valve will take just the actuator head

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Dave

www.drlgas.co.uk


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