Hotpoint aquarius washing machine displaying tESt +won't do anything

SOURCE: Error message

Hotpoint’s are designed to go into test mode when the start button and the on/off button are pressed at the same time. If you are stuck in Test mode, simply hold the start button down until it comes out of test mode, then hold both the start buttons and the on/off button down until you see ‘D:end’ (or similar message)."

SOURCE: HOW CAN I GET MY HOTPOINT AQUARIUS 1400 - OFF CONSTANT TEST PROGRAM?

This works

To exit the TEST mode, press and hold down the "Start/Cancel" button until ALL of the console lights light up. Press both "Start/Cancel" and On/Off buttons simultaneously until " dOFF " appears in the display. The default setting will now appear and the machine can be used normally.

SOURCE: hotpoint wf640 washer says 'test'

hold down start button untill unit comes out of test. Then hold start and on/off button untill it gives you test end message.

SOURCE: 'test' displayed on washing machine

After pressing different buttons and waiting 10 to 15 seconds after turning the power off, I have finally found the solution.
When you have pressed the "Start/Cancel" button to start your wash programme the LCD shows "test".
You must then press the "Start/Cancel" button which will give you the normal temperature and washing time and then importantly you must depress both the "Start/Cancel" button with the "On/Off" button which will give you a different LCD message and then it will automatically resets itself.

ALL THE BEST!

SOURCE: test light

Press and hold "on/off" and "start" buttons together for five seconds.