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Mend Potterton Promax Pressure Heating Engineer

potterton promax boiler loosing pressure?

My boiler keeps loosing pressure soon after heating turned off. engineer has changed the pressure valve and follow all the guide he has given. still looses the pressure soon after heating is turned on. after filling up if heating not used pressure stays normal until heating is used again. cannot find any other leak apart from overflow.

Ashik
April 2013

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