Panasonic CS-E7NKDW / CS-E9NKDW / CS-E12NKDW / CS-E15NKDW / CS-E18NKDW / CU-E7NKD / CU-E9NKD / CU-E12NKD / CU-E15NKD / CU-E18NKD Service Manual ▷ View online
101
16.4.27 F97 (Compressor Overheating)
Malfunction Decision Conditions
During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the
compressor tank temperature sensor.
Malfunction Caused
Faulty compressor tank temperature sensor
2/3 way valve closed
Refrigerant shortage (refrigerant leakage)
Faulty outdoor unit PCB
Faulty
compressor
Troubleshooting
102
16.4.28 F98 (Input Over Current Detection)
Malfunction Decision Conditions
During operation of cooling and heating, when an input over-current (X value in Total Running Current Control) is
detected by checking the input current value being detected by current transformer (CT) with the compressor
running.
running.
Malfunction Caused
Excessive
refrigerant.
Faulty outdoor unit PCB.
Troubleshooting
103
16.4.29 F99 (Output Over Current Detection)
Malfunction Decision Conditions
During operation of cooling and heating, when an output over-current (DC peak current value at IPM Prevention
Control) is detected by checking the current that flows in the inverter DC peak sensing circuitry.
Malfunction Caused
Faulty outdoor unit PCB
Faulty
compressor
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.
Tester’s negative terminal
Power transistor (+)
UVW
Power transistor (-)
UVW
Tester’s positive terminal
UVW
Power transistor (+)
UVW
Power transistor (-)
Normal resistance
Several kΩ to several MΩ
Abnormal resistance
0 or ∞
104
WARNING
17. Disassembly and Assembly Instructions
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.
17.1 CS-E7NK CS-E9NK CS-E12NK CS-E15NK
17.1.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal
Procedures
17.1.1.1 To remove front grille
Figure 1
17.1.1.2 To remove electronic controller
Figure 2
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