Replacing the High Limit

To avoid electrical shock or property damage, disconnect power before installing or servicing equipment. A qualified technician must perform the service procedures.

Disconnect electrical supply to unit.
Remove the cabinet top.
Remove the two wires attached to the high limit.
Check for continuity across the two terminals of the high limit. As long as the temperature of the cabinet is below 210° F (99° C), and the blower is operating properly, the high limit should be closed. If the high limit is defective, continue with the following steps.
Remove the two screws securing the high limit to the heater, and pull high limit from heater.
Install new high limit in reverse order.
Replace the cabinet top.
Reconnect electrical supply to the cabinet.