Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach FGA / U-gauge to burner pressure test point
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Check the maximum and minimum burner pressures are correct via the procedure listed in manufacturer instructions section 4. Service and Maintenance.
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Note:
When "U" gauge is removed test point should be tightened and checked for gas tightness.