Long story short, I replaced my central heating pump and it worked OK until the next morning. It's a primaflow pump and it was showing error e4 which from the book is "open phase protection". When I took it off I managed to get it running again. Put it all back together and worked OK until this morning, same fault.
The boiler also wouldn't come on when this fault is present so I think there must be an airlock around the boiler. Is there any other way to bleed the system as I've tried bleeding all the radiators?
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