Set Appliance State:

Mains Power Off
CH Demand
Boiler CH thermostat set to MAX
Attach temperature probes as per the red arrows
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow the appliance to fire in central heating mode and heat until maximum temperature is reached.
Monitor the appliance temperature and observe the display.
Note:
1. Do not rely on the boilers temperature reading.
2. It may be advisable to turn off some radiators to speed up this test.
Please select from the options below:
BOILER OVERHEATS BEFORE 90°C IS REACHED
BOILER CONTINUES TO HEAT BEYOND 90°C