Replacing the High Limit

Overview

This section should be followed when replacing either of the two high limits in the cabinet. If there is a heating problem in the cabinet, both high limits should be tested.

Procedure

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

1. Disconnect the electrical supply to the cabinet.

2. Remove the access panel from the top of the cabinet.

3. Remove the wires attached to the high limit.

4. Check across high limit terminals for continuity. As long as cabinet temperature is below 210°F and blower has been operating properly, high limit should be closed, or read no resistance. If high limit is found to be defective, replace it by continuing with the following instructions.

   

5. Remove two screws that hold high limit to the heater.

6. Remove the high limit.

7. Install a new high limit in reverse order.

8. Reconnect the two wires to the high limit.

9. Replace the access panel to the module.

10. Reconnect the electrical supply to the cabinet.