I have a Watermill negative head shower pump which keeps cutting out mid shower, any suggestions? We have to leave the airing cuboard door open where it's installed, turn it off and leave it for a few minutes before turning it on again. Not convenient wheen you're soaking wet!!!

SOURCE: WATERMILL SHOWER PUMP - On turning on the shower

This sounds like a problem with the flow switch(es) that control the operation of the pump motor.

When the pressure decreases I assume that the pump has switched itself off - check this before going any further, but I will assume that this is the case. (If the pump is still running when the pressure decreases then you have a really strange problem and I would need to think again).

The pump motor is controlled by flow switches on the outlet side of the pump - when the shower valve is opened the flow of water activates a switch that supplies power to the pump motor. There will be one flow switch on the hot outlet from the pump and another on the cold outlet.

I assume that one or both of the flow switches is not operating correctly. This can be either a fault with the switch(es) or insufficient water pressure on the inlet side. Has anything changed that might have reduced the pressure on the inlet side of the pump? Have you moved the water tank that supplies the pump? (cold water storage tank)

If there is adequate pressure on the inlet then one or both of the flow switches is not working correctly. To further diagnose the problem try turning the shower valve to cold water only and test the operation of the pump, then turn it to hottest and test again.

If the pump operates correctly on cold only or hot only then the associated flow switch is OK, and the other one is faulty.

Replacing a flow switch is not difficult if you are reasonably handy, and I am happy to provide further help if you need it.

SOURCE: CLOGGED SHOWER HEAD - HOW TO CLEAN

You can dip a shower head and CLR or Oxsee clean. You can do it the old-fashioned way and use a needle or a small nail and clean out every little hole or you can run high-pressure water through the opposite end of the showerhead. Little carbon and gasket material finds its way through your screens and filters into your house and comes through your showerhead clogging it. if you can get those clogs out by simply running water backwards through it, you might solve your problem, but you must take it off to do this. simply's unscrew it counterclockwise. it should come off remember to use thread tape to put it back on and make sure the rubber gasket is also inside

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