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Its an older system (boiler 7 yrs old). I have recently changed the 3 port (honeywell) and the programmer to try to fix another prob... HW in cylinder not getting hot when both CH and HW are on... Am stiffled and can't work out best plan of action. There is also a small hall rad which looks like...

Hi all Pott Prima 50 has 22mm flow and return for about 1.5 m to 3 port then the heating flow comes out of it and immediately reduces to 15mm... Is this ok? If the boiler runs at full heat it bangs like a b**tard! Any ideas Jelboy

I haven't checked the voltage ... How will that help? It is a new valve

Hi There I have a strange problem. The system consists of a Potterton Prima 50, new Potterton 2000 controller and new honeywell 3 port and appropriate pipe sizing... The ongoing prob is the hw will heat up on its own, and the CH will heat up on its own BUT as soon as you run the 2...

Hi all :oops: Please help. I have a problem with a heating system. It has a Potterton Suprima 100 and is a drop system. I have 3 downstairs rads that are not getting heat and the pipes up to them are... No Trv's at all and new pump has been fitted along with the obligatary pcb in the boiler...