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home heating system?my potterton suprima is staying on when both hot and he?

my potterton suprima is staying on when both hot and heating switch is turned off it gets too hot and i need to turn off from mains
lizzy, April 2009
Motorised Valve - possibly located in the airing cupboard, sound like the valve actuator is faulty and causing the boiler & pump to run 24/7

www.elanar.co.uk, April 2009
link Click here to see other fixes for Potterton.