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david4924
having problems with a potterton promax 28 he, no fault codes showing call for heat and nothing happens only tempreture displayed. put hot tap on and hot water light comes on but its only the pump that kicks in then nothing else happens. when you reset it the fan kicks in for pre purge so fan is ok. was thinking the p.c.b but an expensive part so want to be sure, anyone ever came across this?