Set Appliance State:

Mains Power Off
Set Multimeter to DC Volts Set meter to measure DC Volts
CH Demand Off
Remove control box cover
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure DC voltage across terminals 3 and 5 of the Timer.
Expect approx. 24Vdc across the terminals.