Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
CH temperature control to max
Gain access to PCB (use insulation mat as necessary)
Ensure appliance is in CH Mode
Gain access to PCB (use insulation mat as necessary)
Ensure appliance is in CH Mode
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure voltage across terminal marked 7 and the terminal marked N on the controls installer interface.
Approximately 24 volts DC expected
Approximately 24 volts DC expected
Isolate as per TOPs P4
and refit as necessary