Gloworm betacom 24c - no hot water but heating working

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We have the above boiler and today we don't seem to be able to get any hot water (combi/condensing style).

The central heating is working fine but when a hot tap is turned on it's as if the boiler doesn't recognise that there is demand and doesn't fire up.

Its the boiler with the 7 neon lights and there are no fault lights lit or flashing.

Ideas anyone?
 
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This is the instruction manual. I wondered if it might be a fault with the DHW sensor - maybe not detecting water flow?
 
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Almost certainly needs a new flow turbine assembly.

AFAIR it is not a diy job, the gas valve has to come out for access and requires the tests for gas leaks (and that is not just chucking soapy water over the joints)
 
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Thanks for that gents. Will call a gas fitter in the morning.

Thanks
 
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