TROUBLESHOOTING GUIDE
SYMPTOM | POSSIBLE CAUSE | EVALUATION |
Holding Cabinet will | Incoming Power Supply | Verify power cord is secured firmly in receptacle. |
not heat |
| Measure the incoming voltage. Check circuit |
|
| breakers. Reset if required. Call power company |
|
| if needed. |
| Power Switch | Check continuity between switch terminals. |
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| Replace switch as needed. |
|
|
|
Unit doesn’t reach | Thermocouple | Check for continuity in circuit. |
desired temperature |
|
|
| Heat Element | Compare cavity temperature with display reading. |
|
| Insert temperature probe into center of cavity. |
|
| Acceptable temperature variation is +/- 20° from |
|
| display reading. |
|
| Check for loose connection. |
|
| Check the Amp draw on each element for proper |
|
| load. Check page 2 for rating information. If the |
|
| amp draw is high or low, check the individual |
|
| elements for opens, shorts and proper resistance. |
|
| WITH POWER OFF: To check resistance of the |
|
| elements, remove all leads from the elements and |
|
| use a digital multimeter. |
|
| The element resistance should be as follows: |
|
| 120V – 87 ohms |
|
| Replace heating element (shelf) as needed. |
|
| Check thermostat (common wire). Please note |
|
| that if thermostat is bad, both circuits will be bad. |
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|
|
Temperature is too | Thermocouple | Check for incorrectly wired thermocouple. |
high |
| Thermocouple wire polarities are reversed. |
| Heat Element | Compare cavity temperature with display reading. |
|
| Insert temperature probe into center of cavity. |
|
| Acceptable temperature variation is +/- 20° from |
|
| display reading. |
|
| Check for loose connection. |
|
| Check the Amp draw on each element for proper |
|
| load. Check page 2 for rating information. If the |
|
| amp draw is high or low, check the individual |
|
| elements for opens, shorts and proper resistance. |
|
| WITH POWER OFF: To check resistance of the |
|
| elements, remove all leads from the elements and |
|
| use a digital multimeter. |
|
| The element resistance should be as follows: |
|
| 120V – 87 ohms |
|
| Replace heating element (shelf) as needed. |
|
|
|
6 | Holding Cabinet – Service Manual |