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I have a Potterton Puma 100e combi boiler which is about 3 years old. Last week the above boiler had a new diverter valve fitted which cured a problem of the upstairs rads being hot and downstairs being cold. Since then the rads have been heating up fine, but one of the downstairs rads will...

i have a combi boiler, and have just had a new diverter valve valve fitted but now one of the rads in the house wont cool down even when the rad thermostat is switched off, and that rad has not been touched. please help thanks