Hi I have two problems with my central heating system.1. water seems to be running into the expansion tank from the vent pipe. I think this is when the system is on "hot water" only?2. The on/off tap on the cold feed to the expansion tank was left closed at some point and I noticed this when the system became noisy. However this alerted me to the fact that the header tank seems to need topping-up on a regular basis is this normal? and should I now just leave the feed tap on and forget about it?Thanks
[quote="htg engineer"]The tank should be fed via a ballvalve therefore there should be a constant cold supply and any isolation valves should be left open, the tank will refill itself when the water level drops.
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