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My Potterton Prima 50F keeps firing up when the timer is off?

Had Gas board out and they said it is okay but it comes on about 4 or 5 times during night and then goes off the heating and water do not come on just .
Sheilagh smith, October 2007
COULD BE MOTORISED VALVE STUCK USUALLY IN HOT PRESS------OR IT MAY HAVE A FROST T/STAT CONNECTED

WP, November 2007
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