Cabinet Troubleshooting
Failure modes not accompanied by a master control display are shown below with possible causes and tests.
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| Possible Causes |
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| Tests |
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| • No power to cord. |
| • Check for line voltage at the switch | |||
| Unit fails to power |
| • | Blown 20 amp fuse. |
| and the transformer. | |||
| up; fans don’t run. |
| • | Circuit breaker open. |
| • Reset circuit breaker. | |||
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| Unit powers up and |
| • | Broken or improperly |
| • Switch ribbon cable from functioning | |||
| fans run; a display |
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| seated ribbon cable. |
| display to failed component to isolate | |||
| fails to light. |
| • | Defective display. |
| problem. | |||
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| Unit powers up and |
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| • Check for 5VDC at communication | ||
| fans run; all |
| Failed power supply. |
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| board and distribution boards. | ||||||
| displays fail to light. |
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| • Ensure heater leads and power inputs | |
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| on the distribution boards are properly | |
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| seated. | |
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| • Test for 208VAC input on distribution | |
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| • | Improper wiring on |
| board and 208VAC output from heater | ||
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| leads to heater plate when the unit is | ||||
| Rows heat |
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| distribution board. |
| calling for heat. | |||
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| • | Defective distribution |
| • Switch power leads from properly | ||||
| improperly or not at |
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| board. |
| operating row to faulty row to isolate | |||
| all. |
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| • | Defective heater. |
| problem. | ||||
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| • | Defective sensor. |
| • Check resistance of RTD lead against | ||
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| temperature chart. See Page | |
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| • Switch RTD lead from properly | |
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| operating row to faulty row to isolate | |
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| problem. | |
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| • Test continuity of heater plate. | |
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