III. Service Diagnosis
WARNING
1.This unit should be disassembled or repaired only by a qualified service technician to reduce the risk of injury, electric shock, or fire.
2.Do not make any alterations to the unit. This could cause water leak, electric shock, or fire.
3.To help reduce the risk of electric shock, do not touch the attachment plug or switches with damp hands.
4.In case of insufficient refrigeration performance, move the stored food product into another unit to prevent its deterioration.
A. Alarm Signals
In the event of operation outside of normal parameters, the control board identifies the issue with an alarm signal. The alarm signal and cabinet temperature are displayed in
Alarm | Priority | Problem | Reset, Corrections, and Adjustments | |
Signal | ||||
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| High Temperature Alarm (cabinet only) | When the temperature returns to the setpoint | |
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| range, alarm resets. | |
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| Cabinet temperature has exceeded the |
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| setpoint temperature by 18°F (10°C) for | Close doors/drawers and clean the condenser and | |
E1 | 8 | more than x hours. The default value of | air filter. Check for refrigerant leaks. Check cabinet | |
x is "2". | thermistor. | |||
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| The value of x can be changed under "F3" on the | |
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| Service Menu. | |
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| (0=No delay; 1=1 hour; 2=2 hours; 3=3 hours) | |
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| Low Temperature Alarm (cabinet only) | When the temperature returns to the setpoint | |
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| range, alarm resets. | |
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| Cabinet temperature has remained |
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| below the setpoint by 9°F (5°C) for more | Ambient temperature too low. Check thermistor, | |
E2 | 9 | than y hours. The default value of y is | liquid line valve sticking, fans not operating. | |
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| "1". |
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| The value of y can be changed under "F4" on the | |
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| Service Menu. | |
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| (0=No delay; 1=hour) | |
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| Defrost Alarm (cabinet only) | Turn the power off, then back on. | |
E3 | 7 | Cabinet defrost has taken longer than | Check defrost heater, defrost thermistor. | |
1 hour. The control board has terminated |
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| defrost. | Note that "E3" may alternate with "dF" instead of | |
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| the temperature. |
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