Set Appliance State:

Mains Power Off
Ensure NO demands are present
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

When power is switched on the boiler will run a self-check.
Allow 30 seconds for self-test to complete before proceeding.
If self-check has completed successfully the ON led will be illuminated.
If a FAULT CODE is flashing, choose fault codes below
(shown as any led flashing).