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I'm definitely looking under the cover, I can't see an air vent on the boiler itself. There is a square nut on the top left and what looks like a drain valve on the bottom left. It's a pretty old boiler. There is a small air vent off one of the pipes leading from the water tank. I loosened the...

I'm not sure, how would I tell? My knowledge of the system is limited I'm afraid. There is a valve that allows me to add pressure to the system, the gauge notes that the pressure is about 1.5.

Thanks, I can't see an air vent on the boiler, but there is what looks like a drain valve on the bottom left. Last night I noticed that the pipes taking hot water to our tank had started rattling, not violently, but enough for me to hear from the room upstairs. There is what appears to be a...

Thanks John, I'll take a look for an air vent when I get home from work. The system was drained when the leak was fixed so an air lock is feasible. We've not had this problem with the boiler prior to the leak.

Thanks, as far as I can tell there is no air lock, all of the radiatotrs in the system get hot, as to the pipes leading to and from the water cylinder. It's been suggested to me that the PCB could be at fault, does that sound right?

Hi I'm hoping for some advice on what to do next with a boiler problem we have been experiencing for the last month. We had a leak off one of the central heating pipes and had to shut off the CH to have it fixed. When it was switched back on the boiler wouldn't fire. The engineer diagnosed a...