M9/M11 Sterilizer High-Limit Thermostats Location / Function Test and Repair
To prevent risk of shock always disconnect power before removing covers or performing any service procedure.
During all Modes
Line voltage continually flows thru the normally closed contacts of the two high-limit thermostats. This circuit powers all of the line voltage components, except for the fan system.
If the temperature at either of the thermostats exceeds 450°F (+/- 25°) / 232°C (+/- 14°), the thermostat contacts open. This interrupts power, and terminates the cycle. An error code will appear on the display.
The thermostat contacts reset to the closed position at approximately 325°F /163°C.
High-Limit Thermostat Continuity Test
Thermostats must be tested at room temperature.
1.Disconnect sterilizer power cord.
2.Disconnect wires from thermostat.
3.Set meter to 200 Ω
4.Place meter probes on thermostat terminals.
| Meter Reading | Required Action |
|---|---|
|
Approximately 0.0 Ω |
Thermostat is good |
|
OL |
Replace thermostat |
