Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Remove the Fan Connector from the fan assembly and make safe
Boiler Thermostat to MAX
CH Demand
On / Off switch OFF
Boiler Thermostat to MAX
CH Demand
On / Off switch OFF
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Place the black probe on the brown wire (N), the red probe
on the yellow wire (PWM) then turn the On / Off switch ON
while monitoring the AC Voltage.
Expect an initial voltage when the On / Off switch is first turned
on which then increases after approximately 6 seconds.
Note:
Repeat test from the beginning as necessary
until the result has been accurately determined.
on the yellow wire (PWM) then turn the On / Off switch ON
while monitoring the AC Voltage.
Expect an initial voltage when the On / Off switch is first turned
on which then increases after approximately 6 seconds.
Note:
Repeat test from the beginning as necessary
until the result has been accurately determined.
Isolate as per TOPs P4
and refit as necessary