DIY Doctor UK DIY Forums

Posted: **Sun Jan 10, 2016 1:36 pm**

My central heating system has a Potterton Suprima 40 boiler which continues to heat radiators even when time clock is off and room thermostat is turned down. The green and amber light on the boiler appear to be working correctly so any help would be appreciated.

Posted: **Mon Jan 11, 2016 12:57 pm**

When I say the radiators continue to heat I mean they get scalding hot even when the programmer is off and the room thermostat is turned way down. Could it be the motorized valve?

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Potterton Suprima 40 Boiler Continues Heating Radiators Even when Clock off

Potterton Suprima 40 Boiler Continues Heating Radiators Even when Clock off

Re: Potterton Suprima 40 Boiler Continues Heating Radiators Even when Clock off