Set Appliance State:

Ensure boiler is cool
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to complete its self-check.
If a fault code is displayed, reset boiler.
Turn on a hot water tap.
Does the boiler operate without alarm 07 occurring?
Note:
1. If the boiler fault code changes from the original to a different fault code, then CLICK HERE.