Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect orange wires from overheat thermostat
Measurement:
Measure resistance across spade terminals of overheat thermostat.
Note:
Overheat thermostat is of the auto reset type and should only be open
circuit if boiler is at excessive temperature i.e. above 110 degrees C.
Note:
Overheat thermostat is of the auto reset type and should only be open
circuit if boiler is at excessive temperature i.e. above 110 degrees C.
Isolate as per TOPs P4
and refit as necessary