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Mend Potterton Puma Boiler Heating Fault

potterton puma on h/w mode fires up then the water goes cold about 20 secon?

potterton puma hw fires up then 20 seconds later goes cold

garry
September 2009
may be a faulty wax capsule on the diverter valve, is the heating ok?

Ian
September 2009

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