Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Connect the air pressure switch charge kit to +ve connection on the air pressure switch.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Note the operating pressure indicated on the pressure switch.
When the fan begins to run, Increase the pressure via
the syringe to that indicated on the pressure switch.
Is sparking now visible at the electrodes?
Note:
If sparking is still not observed it is permissible to
increase the pressure by 50%.