Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
CH Demand
Measurement:
Measure the Resistance across the connection marked SL and the connection marked 1 on the main connector block located on the Interconnection Board.
Note.
If a Room Thermostat or other External Controls are not fitted a Red Link Wire will bridge connections marked SL and 1.
Note.
If a Room Thermostat or other External Controls are not fitted a Red Link Wire will bridge connections marked SL and 1.
