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The red button will either unscrew, letiing air out, or some just need gently pulling up.

Normal display, it just tells you the heating is on.

20mm

Always sleeve mine through steels

Possibly shower valve or mixer tap fault, can be difficult to trace.

Ferroli= skip

I'm going to bet a virtual £ that somewhere under the flooring, a flow is mistakenly plumbed into a return, as per my previous post. Please let us know, so that I can give you details of my virtual crypto account for my virtual £.

A light bulb went on when you mentioned possible DIY install, what's the betting it's a combi conversion, and Mr DIYer has got the pipework wrong under the floor, so that for example the flow is going down what was the old cylinder return, or something similar? This happened to me when...

I never use gate valves now because they seize quite quickly, or never close properly when you want them to. Use a lever valve instead.

Join the two valves together with some temporary bodge plastic pipe, open valves and turn heating on, you'll know then.

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Outrageous I reckon.

Do you have a dead body in the loft you don't want them to find?

That pipe is nothing to do with your air lock

Have another beer, problem will disappear

Yes

This, of course assumes the pump is fitted the right way round.

Did I mention this possibility earlier?

Tell him to do one.

If you're sure the fault is shower related only, and definitely doesn't happen with hot taps, then I'd be looking at shower valve.