how can I fix my glow-worm fuelsaver?

it runs ok starts up and fires gets water in central heating warm and hot water warm but not hot checked room thermostat and hot watercylinder stat they ok the boiler does not seam to stay om long enough as it uesd to I wonder if the
thermostat in the boiler had broke and can i replace it
Alan McvCormack, November 2005


done
Could be the circulating pump failed or blockage in pipework

Rmc, November 2005
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