| Problems | Symptom | Causes | Checks | Measures | Remarks | |
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| Bad defrost. | Defrost is not | Defrost lead wire is cut. | Check if defrost lead wire is cut with a | Reconnect Lead |
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| working. |
| tester. | Wire. |
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| Defective defrost driving relay. | Check the voltage of CON2 (1 and 7) | Replace relay (RY 7 | Refer to load |
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| with a tester after pressing main | and RY 3) or PCB. | driving conditions |
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| PCB test switch twice. |
| check in circuit |
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| If the voltage is normal then it is OK. |
| explanation. |
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| Defective defrost sensor parts. | Check the resistance of defrost sensor | Replace defrost | Refer to sensor |
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| with a tester. | sensor. | resistance |
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| characteristic |
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| table of circuit |
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| explanation. |
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| Defective | Buzzer | Defective connecting lead wire from | Check lead wire related to door | Repair lead wire. |
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- | buzzer | continuously | main PCB to door switch. | switch with a tester. |
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| rings or door | Defective door switch parts. | Refer to door switch in parts repair | Replace door switch. |
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| opening alarm |
| guide. |
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| does not work. |
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| Defective | Buzzer does | Key input wire is cut or bad connector | Check input wire with a tester. | Reconnect lead | Refer to display | |
| display button | not ring and | terminal contact in main PCB and |
| wire and replace or | circuit in circuit | |
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| key does not | display PCB connecting lead wire. |
| directly connect bad | explanation. | |
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| sense even |
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| contact terminal to |
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| button is |
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| lead wire. |
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| pressed. |
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| Key is continuously depressed due to | Disassemble frame display and confirm | Adjust or replace |
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| structural interference. | visually. | interfering |
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| structures. |
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TROUBLE DIAGNOSIS
