Only 3 radiators working out of 7 All aspects of plumbing questions and answers, help, tips and information

[philbarrow]

I have a combi boiler with 7 radiators, 4 up 3 down. I lost heat to 2 downstair radiators so drained the system. since re-filling I have now lost 2 more - 1 up and 1 down. Pump is fine and working well but i am not getting any heat on the return to the boiler. Help!!!

[steve the plumber]

Sounds like a large air lock in the system. You'll need to get a professional in.