10-6. Troubleshooting flow
MUZ-GB50VA
A How to check inverter/ compressor
Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
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| W • After the outdoor fan starts running, wait for 1 minutes or more before | ||||||||
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Measure the voltage between each |
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lead wire leading to the compressor. |
| • The output voltage values have the tolerance of i20%. |
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U (BLK) - V (WHT) |
| No |
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V (WHT) - W (RED) |
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| COOL | HEAT | |
W (RED) - U (BLK) |
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Is voltage output on right table? |
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| 122V~154V | 74V~126V | ||
| Yes | No |
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| (56Hz~71Hz) | (30Hz~58Hz) |
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Is output balanced? |
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| Yes |
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Is the input voltage to the outdoor electronic No |
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control P.C. board 370V or more? |
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| Replace the power board. |
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| Yes |
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Turn off power supply of indoor and outdoor unit, |
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and measure the compressor winding resistance No |
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between the compressor terminals. |
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Is the resistance between each terminal normal? |
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| Yes |
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| Replace the |
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| compressor. |
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Reconnect the lead wire of compressor, and turn on power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
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