Low pressure light on electric shower

[Shel]

I have a low pressure light on a tenants electric shower, it completely cuts the water off. They say they have not had any other appliances on and it is now getting worse. The boiler is a condensing boiler. Any help welcomed.

 

[leelister6]

I am sorry if I offended but if the problem is pressure as indicated by the light then the solution is either a pump to increase the pressure, or replace the electric shower with electric shower with an integral pump. The only other thing it can be is a faulty electric shower and to check that you simply unscrew the shower head, and screw in a pressure gage. If the pressure reading falls below the minimum required for the shower to work (normally between 0.8 and 1.0 bars), then the problem is solved with a pump. If the pressure is over 1.0 bars its a faulty electric shower.

May be missing something here but why check the outlet pressure on the shower? That tells you absolutely nothing! If the low pressure light is on it's the incoming pressure that's low and needs checking on a tap in the bathroom or kitchen. If the pressure at all other outlets is ok, then it's the shower that's knacked

 

[Alan Wright]

You can check the pressure at the shower with and without a tap running so you can see if at anytime if it falls below the minimum required for electric shower. If the pressure at the shower remains above 1.0 bars then you know the pressure sensor in the electric shower is faulty. If the pressure drops below 0.8 bars then you know the pressure sensor in the shower is telling the truth and you need a pump to increase the pressure.

 

[Ben-gee]

Hang on a minute.

As a working domestic plumber 19 times out of 20 this fault (in our area) is caused by limescale - the other time by blocked filter , the other time by herniated hose; ok so 18 out of twenty it’s limescale....

I have read this op as the shower worked initially and the fault came on much later.

Alan’s point is valid if the shower showed this light from the get go - but personally that’s never happened to me.

 

[miiksd]

Either way, first thing to check is the inlet strainer/filters on the incoming supply at the shower unit.