about 2 weeeks ago I drained my central heating system to fit a new readiator and a thermostat valve and new lockshield.
On re-filling the system there was an airlock, to overcome this I connected a hose from the cold tap in the bathroom to the feed pipe from the F&E tank. Afer this system filled ok, all radiators working.
About a week later I discovered hot water in the F&E Tank. The hot water is coming into the F&E Tank via an open vent pipe from the heating coil in the hot water cylinder. There is another ventpipe into the F&E tank from the pump, this apperas to be ok.
I have changed the boiler thermostat, the pump is running on minimum. It as if the water is being taken from the F&E tank via the feed pipe and circulating back up the vent pipe.
The system apperas to be working correctly except for this issue, I am now at a loss as to what to check next.
The feed and expansion connections to a vented heating system should be on the same leg, and no more than 150mm apart to prevent this happening.
Your system may have started this because the pump speed is now set higher or you have shut the lockshield valves too far when balancing the radiators. Either way, the system has a built in design fault.
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