Read Panasonic CS-E21JB4EA / CU-E21HBEA Service Manual online
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15.5.24. F99 (Output Over Current Detection)
Malfunction Decision Conditions
During operation of cooling and heating, when an output over-current (20.2A) is detected by checking the current that flows in the
inverter DC peak sensing circuitry.
During operation of cooling and heating, when an output over-current (20.2A) is detected by checking the current that flows in 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.
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