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Thanks for all the advice. I have now changed the hi and low stads and the system is working. However to start with radiators upstairs were roasting and downstairs stone cold. I switched off the burner and left the pump running all night and the system cleared the air, now a very hot house...

Thanks, I have three port valve, I will try bleeding the system again.

Thanks for replying. I have removed the pump and the impellor is turning, the shut off valves were leaking on assembly (cheap type) and I replaced them with quality valves but in doing so I had to drain the system not somethink I like doing). I have a room thermostadt and I have checked the...

First problem,radaitors are not reaching full temp, the burner cuts out due to the low temp switch. 2nd problem the gas solonoid valve was O/C, I exchanged that now its fine. 3rd problem drayton motorised valve not operating exchange that lasted two weeks and replaced it again. I now only have...