Set Appliance State:

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

Observation:

Increase the system pressure slowly while observing the boilers display, increase pressure to approximately 1.0 - 1.4 bar.
Note.
The boiler may enter the air vent function during re-pressurising the system, this will run automatically for a period of 5 minutes (pump pulses ON/OFF), the boiler will not respond to any demands until the air vent function has completed.