Set Appliance State:
Gas Off
Set Multimeter to AC Volts 
CH Demand
Air heater switch set to constant
Thermistor-stat set to maximum
Thermistor-stat set to maximum
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow the ignition sequence to commence and burner ignite.
After approximately 90 seconds measure the voltage across connections 1 (pink lead) and connection 2 (red lead) on the control module.
Voltage should increase from approximately 90 volts to approximately 210 volts with fan running at full speed.
After approximately 90 seconds measure the voltage across connections 1 (pink lead) and connection 2 (red lead) on the control module.
Voltage should increase from approximately 90 volts to approximately 210 volts with fan running at full speed.
Isolate as per TOPs P4
and refit as necessary