Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach temperature clamp to boiler flow pipe
Turn temperature control knob to MAX (see note 1)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow burner to ignite and establish.
Monitor appliance flow temperature, does the burner shut down
when the flow temperature has reached approximately 80°C?
Notes:
1. To turn the control knob above 5 (approx. 65°C) it is necessary to turn the blue Energy Saving System (ESS) screw on the knob clockwise. The knob is now free to turn to the MAX position (approx. 80°C).
2. You may wish to turn off some radiators to reduce time taken for this test.