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97
16.4.30. F99 (Output Over Current Detection)
Malfunction Decision Conditions
During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in
the inverter DC peak sensing circuitry.
the inverter DC peak sensing circuitry.
Malfunction Caused
• DC peak due to compressor failure.
• DC peak due to defective power transistor(s).
• DC peak due to defective outdoor unit PCB.
• DC peak due to defective power transistor(s).
• DC peak due to defective outdoor unit PCB.
Troubleshooting
• Checking the power transistor
• Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
• If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using the tester.
• For the UVW, make measurement at the Faston terminal on the board of the relay connector.
• Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
• If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using the tester.
• For the UVW, make measurement at the Faston terminal on the board of the relay connector.
Tester’s negative terminal
Power transistor (+)
UVW
Power transistor (-)
UVW
Tester’s positive terminal
UVW
Power transistor (+)
UVW
Power transistor (-)
Normal resistance
Several k
Ω to several MΩ
Abnormal resistance
0 or
98
17 Disassembly and Assembly Instructions
17.1. Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor
Removal Procedures
17.1.1.
To remove front grille
17.1.2.
To remove power electronic controller
High voltages are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding
with repair work. Failure to heed this caution may result in electric shocks.
with repair work. Failure to heed this caution may result in electric shocks.
99
17.1.3.
To remove discharge grille
100
17.1.4.
To remove control board
17.1.5.
To remove cross flow fan and indoor fan motor
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