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thank I solve the problem for the suprima

potterton promax system no hot water no heating programmer light on nothing appear on the boiler expect power green light test 2port valve no movment

thanks every one

suprima 50 heating working hot water flame few second and green light new pcb any help please thanks {2 port valve} if you want heating the boiler work find if youi want hot water the boiler light for a few second and the green light flash

Ok thanks

No if the pressure is1.5 or 2.5 the water discharge

i have to put pressure back and after the pressure drop again when the heating is on

I just change a pressure relay valve on vaillant ecotec 24 but still the water going out any clue please thanks