Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Attach pressure gauge to inlet pressure test point
Test point is located on the inlet of the gas service valve on the appliance
DHW temperature selector to 0 position
CH temperature selector to 0 position
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset lockout as necessary.
Allow appliance to self check and return to standby mode.
DHW temperature selector to maximum position.
Turn hot water tap ON.
Allow fan to run and ignition sequence to commence.
Does the gauge show a constant inlet pressure of at least 37mb (propane G31)?
Note:
When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.