power shower pump surging

Joined
11 May 2022
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Hi
I have a power shower with a Aquilisa Aquavalve 609.
It has worked fine for years but recently when I move the mixer to certain positions the pump surges. Also, the water pressure has dropped off a bit.
Any ideas about what is causing the problem would be much appreciated
 
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Sounds like a water supply problem. Does it surge when you select cooler or when you select hotter?
 
Usually, that's a sign of vortexing on the suction side. Too much flow for the size of pipe and/or not enough static head.

Nozzle
 
Thanks for the reply
The problem is around the mid temperature
If you turn to cold the flow seems ok and the same if you turn it to hot
 
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There has been no change to the pipe size or static head.
It worked perfectly fine for the last 5 years until a few weeks ago
 

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