Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn CH thermostat up to MAX
Attach PT temperature clamp on flow pipe (front pipe)
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow boiler and system to heat, watching the temperature on the performance tester. The temperature should heat to approx 73°C or 87°C depending on the dip switch setting.
Click here to find out about the dip switch settings.
The boiler should reach this temperature without cutting out on the overheat. It should also shut the burner down when the temperature is reached.