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Can anyone help please? We have an oil fired camry quartet boiler which was serviced 2 years ago and a new fan and fuel pump fitted. In the past week the boiler fires but the radiators are not warming up for at least an hour. I have checked the pump by undoing the screw on the front which shows...

I have an oil fired Camray Quartet central heating system, 10 yrs old. The boiler keeps firing then switching off after 5 mins, no heat going to radiators. I read that I may have an air lock and unscrewed the front of the Grundfos Selecteric 15-50 pump and some air with drips of water came out...