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Glow-worm swiftflow 80 not heating water?

My Glow-worm 80 will only heat water if the central heating is switched on, is this a comon problem and if so is there a simple fix?
Iain, September 2009
you may have a diverter valve fault,or heat exchanger needs cleaning expensive repair !
With an old swift flow combi . your best bet is to replace it with a new more efficent boiler

jts plumbing, September 2009
Sounds like the Flow switch has failed

www.elanar.co.uk, September 2009
link Click here to see other fixes for Glow-Worm.