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Mend Glowworm Ultimate Combi Boiler Central Heating Radiators

why is my combi boiler not staying fired for central heating. water fine?

my Glow worm combi has been having odd days when the central heating isn't working but then has been ok again after a day or two. But now it hasn't worked for the last four days.
Hot water is fine. and it will fire but then goes off after few minutes. If I turn it up the same thing happens and the same with if I turn the on wall thermostat.
Prior to it stopping all together I have had to have it turned up to half way to get the radiators hot,

Amanda
February 2017
GlowwormGlowworm UltimateHeating, Home Heating SystemsCombi Boiler Central Heating Radiators
Possibly the diverter valve is duff.

Glow worm offer a fixed price call out of about £300 including labour and bits. The only things not covered are the heat exchanger and the expansion vessel.

They alspo ooffer a minimum term maintenance contact that does cover labour and all the bits. This is for 6 months at £50 per month and drops to about half that if you want to carry n afterwards.

https://www.glow-worm.co.uk/homeowner/support/repairs/index.en_gb.html

XXX
February 2017

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Glowworm Boiler Not Staying On - CH Only