No.1 U.K. Professional Trade Forum, Plumbing, Gas, Electric, Tiling and Joinery Forum

Hi folks, Firstly I'm on a water well with a tank in my garden, I'm new to this and don't really know much about how it works.
Anyway I have an electric shower which runs directly from this tank with a pump fitted before the shower to boost the pressure. The shower works with pretty poor pressure but when you turn the temp below 5 the low pressure light comes on and the shower goes freezing cold. When you turn the temp up the light goes off and it goes boiling hot.
Any ideas of what's wrong??

first thing to eliminate is the shower hose and head, try it with another if you can loan one.
a simple collapse of the rubber hose or blocking of the head can cause this.

next, take off the head and run into a measure and time it for flow per minute, then work out the same with a basin tap and tell us the shower make and pump capacity.
then check for isolation valves.

All the above checks and the filter inside the inlet of the shower would need checked for debris.

As above, plus have a look at the pump inlet, it may have a filter in that as well.

Thanks for the replys folks. I will do the measurements tomorrow. I have changed the head previously to no avail and the pump is new as the last ones bearings broke. There was a 15mm isolation valve on the inlet but I changed that for a 15mm stop tap to try and increase the flow.