Set Appliance State:
Set Multimeter to Resistance 
DHW Demand
Run the Appliance Until the burner shuts down
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
| Isolate Mains Power to appliance as per TOP's P4 |
Remove the two blue wires from the overheat thermostat.
Measure the temperature of the pipe close to the overheat stat.
Measure the Resistance of the overheat stat across the two exposed terminals.
OPEN CIRCUIT TEMPERATURE ABOVE 105°C
OPEN CIRCUIT TEMPERATURE BELOW 105°C
CLOSED CIRCUIT TEMPERATURE BELOW 105°C
