Mira Sport Shower no temp control in high setting only

[fabgav]

Hi all, not sure if electric or plumbing, but my best guess is electric

Our Mira Sport showers is playing up.
In the high setting, its bloody hot all the way down to the last 2 cold settings.
In Medium setting, the temp control works as normal.
The flow is normal in every setting.

Any quick ideas/fixes?

Cheers all

 

[ban-all-sheds]

What does the inside of your kettle look like?

 

[EFLImpudence]

The flow is normal in every setting.

What do you mean by 'normal'?

It is 'normally' increasing or decreasing the flow which alters the temperature - albeit you have high and low heater settings.

 

[ban-all-sheds]

Most electric showers are very simple devices. They have a heater can with 2 elements in which are either on or off, cold water goes in one end and hot comes out of the other.

The amount of heat put into the water, for any given setting of which elements are on, depends entirely on the rate of water passing through the heater. If it gets too hot then the flow rate is too low.

What does the inside of your kettle look like?

 

[fabgav]

Inside of my kettle is fine, no scale.
The flow of water is the same as it was 4 weeks ago before any problem with the shower.
I can't understand why the temperture control work in low and medium settings but not the high setting?