Shower pump

[andyv1]

My shower pump serves a shower two rooms away with an overhead run of about 8 metres. It has reed switches on hot and cold gravity supplies and starts up every time, but lately it wouldn't stop running when I turned off the shower. I descaled the shower head and this seems to have just about cured it - it runs maybe 1 or 2 seconds then turns off without needing any other action.

Given that the flow gets shut off at the mixer tap and not the shower head, why would descaling help?

Any ideas?

 

[Madrab]

As you suggest, the shower pump is controlled by the flow switches, they sense flow in the pipe and that flow in the pipe is controlled by the valve(s) in the shower.

By that reckoning, descaling the shower head wouldn't alter the way the shower valve and reed switch system works, therefore it can only really be a coincidence IMO.