W
wongo
My boiler (Potterton Suprima 60) fires up OK but the radiators stay cold. It happens when the heating controller is on automatic on/off time settings. The pipes close to the pump (a 20+ years old Grundfos) and Honeywell (new) diversion valve do get hot though. The controller is a Sunvic SunPro2000 installed new last July. However, when I use the manual Advance buttons to switch the heating on I do get heat on the radiators.
Nothing had changed since last July when a new PCB kit was fitted. Everything was working fine until the last few chilly days when I decided to on heating.
Could the problem be the pump or the Sunvic ?. I have the radiators bleed.
Nothing had changed since last July when a new PCB kit was fitted. Everything was working fine until the last few chilly days when I decided to on heating.
Could the problem be the pump or the Sunvic ?. I have the radiators bleed.