heat flame comes on without water tap being turned on, and pressure valve goes to danger level with some horrible noises and has to be switched off immediatly this also happens when CH is switched on (potterton puma 80e)

Ray, March 2008

YOUR HOT WATER MICRO SWITCH IS STICKING ON WHEN YOU TURN YOUR TAPS OFF CAUSING BURNER TO STAY ON AND OVER HEAT CAUSING BANGING,COMMON FAULT ON THIS BOILER THIS IS USUALY CAUSED BY WATER SECTION SEAL LEAKING ONTO WORKINGS

NEW HOT WATER FLOW SECTION REQUIRED AND ALTHOUGH MICRO SWITCH ASSEMBLY CAN BE CLEANED NEW ADVISED

TONY, March 2008