Panasonic CS-NE9NKE Service Manual

Contents

Panasonic CS-NE9NKE Service Manual Manual pdf 88 page image

8815.4.30 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 currentthat 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.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 usingthe 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 (-) UVWTester’s positive terminal UVW Power transistor (+) UVW Power transistor (-)Normal resistance Several kΩ to several MΩAbnormal resistance 0 or ∞