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Mend Potterton Kingfisher MF100 Boiler Heating Programmer

My radiators will not go off?

My potterton kingfisher mf100 will not turn off, even though the programmer is in the off position for both water and heat but the radiators will not turn off. The only way I can turn the boiler off is to turn the switch off on the boiler. What can be done to cure this problem.

Jimbo
April 2018

Potterton Potterton Kingfisher MF100 Heating, Home Heating Systems Boiler Heating Programmer

ch motorised valve might be stuck in demand position

?
May 2018

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Potterton Kingfisher Boiler Stuck On - Fix