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Hot water air locks when CH on

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RobP

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we have an old warehouse on three floors with a tank recirculating hot Water circuit, during summer when the heating was off there were no issues, now the heating is on it airlocks daily & we have to run it off to drag the air out.
All the pipes run in the ceiling above tiles, the pipes aren’t lagged.
Any idea what could be causing it???
 
The hot water to your taps air lock when the heatings on ?
 
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