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hi drain down heating system, and then refill very slowly ,filling to fast could cause the air lock. Gaza.

how do you check if motor is working as you have to drain down boiler to remove valve.just replaced a new valve at a cost of £54.+vat

casper check the isolator valves are open. this may sound obvious but i have had the same problem when asked if i could look at a britony 80 today.which has not been used for 18 months,had to change pump, gas valve stuck , diverter valve goosed.fitted new turned on boiler would not...