Set Appliance State:

On/Off Switch OFF
Set Multimeter to Resistance Set meter to measure resistance
Isolate Mains Power to appliance as per TOPs P4
Remove the transformer from the control box

Measurement:

Test 1: Measure the resistance across the top two pairs of adjacent pins.
Expected resistance approx 100 ohms.
Test 2: Measure the resistance across the bottom two pairs of adjacent pins.
Expected resistance approx 2 ohms.
Note:
Allowances should be made in resistance readings if fused leads are being used.