(Bristan smile) electric shower no pressure, but heat.

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I'm sure this is a really stupid question, sorry. I'm a mechanic so I can use screwdrivers, but I don't know much about electric showers.

The short:

PRD blew.

Removed large amount of lime scale from heater tank and replaced PRD.

Now the shower runs and produces hot water, but it's quiet and there is low pressure.

Solenoid impedance reads 4.4ish.

Both microswitches work if manually pushed in when connected to multimeter.

The spring loaded disc that engages with the micro switches as you turn the control looks like it needs to see pressure behind it to force it to engage?

Any ideas would be amazing.
 
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CBW

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If you have removed a lot of limescale, it might be restricted still if not all of it out. Have you tried it without the hose connected to rule out the head/hose?
 
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