Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
CH Selector in Maximum position
ON/OFF Switch in ON position
Summer/Winter in Winter Position (IN)
Timer Set to ON Position
CH Selector in Maximum position
ON/OFF Switch in ON position
Summer/Winter in Winter Position (IN)
Timer Set to ON Position
Ensure the external controls (if fitted) are calling for heat
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
On the PCB at JP13 measure the voltage between Pins 1 and 2.
Expect approximately 0V DC when the controls are calling.
Note:
If external controls are not fitted ensure the link is in place.
Expect approximately 0V DC when the controls are calling.
Note:
If external controls are not fitted ensure the link is in place.
Isolate as per TOPs P4
and refit as necessary