Set Appliance State:

Mains Power Off
NO Demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the appliance. (Press reset button once then release)
Allow the appliance to complete its 2 minute self check program.
At the end of the self check program the boiler should be at rest
without the fan or pump running.
Note:
1. It is important to wait the full two minutes for the self check program to complete properly even if the boiler appears to have finished within 2 minutes.
2. If the spanner symbol and fault code appear together on the display, you MUST choose the 'FAULT CODE SHOWN' option from below, failure to do so will result in misdiagnosis.