Hi, just looking for some advice. I recently noticed that an overflow pipe was regularly dripping outside. I went to the loft to investigate (thinking maybe a leaky or poorly adjusted ball cock valve). However, it seems to be because the feed and expansion tank is filling with hot water and the condensation is what is causing the drip. Should the F&E tank be filling up with hot water? I don't know a huge amount about heating systems, but this doesn't seem right. Thanks in advance.
What type/ make of boiler do you have. When you say F&E tank do you mean the small header tank or the large cold water storage tank?
With the heating and hot water turned off does the pump still run? If so it could just be a faulty zone valve (end switch).
If there's lots of condensation in the header tank it could be pumping over. What speed is the pump at?
The pump is set at 2, it used to be set to 1, but was turned up because the last radiator in the loop downstairs wasn't getting hot.
I would try it back at 1. If the system is pumping over this will speed up corrosion in the system. If the system stops pumping over at speed 1 then careful balancing should solve the rad issue.
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