Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove transformer from PCB
(This will require the removal of the metal back of the control box)
Remove earth connections prior to removal of plate.

Measurement:

Check resistance across both pairs of pins on the transformer.
Resistance of one pair of pins should be approximately 50 Ohms.
Resistance across the other pair should be approximately 1 Ohm.
Note:
When testing the pairing of the pins refers to pins on the same side
of the oblong shaped cavity in the base of the transformer.