66
15.4.20 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.
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 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 M
Ω
Abnormal resistance
0 or
∞
Summary of Contents for CS-E18NKUA
Page 9: ...9 4 Location of Controls and Components 4 1 Indoor Unit 4 2 Outdoor Unit 4 3 Remote Control ...
Page 10: ...10 5 Dimensions 5 1 Indoor Unit ...
Page 11: ...11 5 2 Outdoor Unit ...
Page 12: ...12 6 Refrigeration Cycle Diagram ...
Page 13: ...13 7 Block Diagram ...
Page 14: ...14 8 Wiring Connection Diagram 8 1 Indoor Unit ...
Page 15: ...15 8 2 Outdoor Unit ...
Page 16: ...16 9 Electronic Circuit Diagram 9 1 Indoor Unit ...
Page 17: ...17 9 2 Outdoor Unit ...
Page 18: ...18 10 Printed Circuit Board 10 1 Indoor Unit 10 1 1 Main Printed Circuit Board ...
Page 19: ...19 10 1 2 Power Printed Circuit Board 10 1 3 Indicator and Receiver Printed Circuit Board ...
Page 20: ...20 10 2 Outdoor Unit 10 2 1 Main Printed Circuit Board ...
Page 21: ...21 10 2 2 Noise Filter Printed Circuit Board ...
Page 45: ...45 15 3 Error Code Table ...
Page 68: ...68 16 1 1 2 To remove discharge grille ...
Page 69: ...69 16 1 1 3 To remove control board 16 1 1 4 To remove cross flow fan and indoor fan motor ...
Page 70: ...70 ...