Set Appliance State:
Set Multimeter to Resistance 
CH Demand
Allow appliance to fire and system to heat until boiler shuts down
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
| Isolate Mains Power to appliance as per TOP's P4 |
Check temperature of flow pipe close to the overheat stat
Disconnect the white the leads from the overheat stat.
Measure resistance across the exposed terminals of the overheat stat.
Expected resistance closed circuit zero resistance.
Please select from below:
OPEN CIRCUIT TEMP ABOVE 98°C
OPEN CIRCUIT TEMP BELOW 98°C
