Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Remove 1 wire from the modureg and make safe
Attach U gauge to burner pressure test point
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

If the boiler locks out during this test it will be necessary to
reset it until the result of the test can be established.
During the sparking stage of the ignition cycle try to adjust
the minimum pressure to the correct level (see table).
Turn the smaller inner nut clockwise to increase the pressure
and anti-clockwise to decrease it.
Can the minimum pressure be set correctly?