Shower cuts out on High

When you first put my shower on it flashes low pressure and always cuts out after 3 seconds when you select the 'high' button. To get the shower hot you have to select 'low', let it run for 5 minutes, select 'high', let it run then turn the shower off and then select 'high' . Do you know whats causing this? I've just sold my house so only wanting to fix it not replace it
Asked 8 years ago by Lisa
This is difficult to work out what the problem is.

In the first instance check that the valve on the line to the shower is fully open ant that the main valve coming into the house is fully open.

Answered 8 years ago by Anonymous

Thanks. We have opened the valve however unsure which one is the shower valve that leads straight to the shower. I've attached a few images to help.

Answered 8 years ago by Lisa Pettigrew

The shower is run off of the mains water supply to the house, which I cannot see from the pictures.
The other possibility is that the PCB is faulty.

Answered 8 years ago by Anonymous

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