
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15.4.25 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-QE12MKE
Page 12: ...12 4 Location of Controls and Components 4 1 Indoor Unit 4 2 Outdoor Unit 4 3 Remote Control ...
Page 13: ...13 5 Dimensions 5 1 Indoor Unit ...
Page 14: ...14 5 2 Outdoor Unit ...
Page 15: ...15 6 Refrigeration Cycle Diagram ...
Page 16: ...16 7 Block Diagram ...
Page 17: ...17 8 Wiring Connection Diagram 8 1 Indoor Unit ...
Page 18: ...18 8 2 Outdoor Unit ...
Page 19: ...19 9 Electronic Circuit Diagram 9 1 Indoor Unit ...
Page 20: ...20 9 2 Outdoor Unit ...
Page 21: ...21 10 Printed Circuit Board 10 1 Indoor Unit 10 1 1 Main Printed Circuit Board ...
Page 22: ...22 10 1 2 Power Printed Circuit Board 10 1 3 Indicator Printed Circuit Board ...
Page 24: ...24 10 2 Outdoor Unit ...
Page 52: ...52 15 3 Error Code Table ...
Page 53: ...53 ...
Page 80: ...80 16 1 3 To remove discharge grille ...
Page 81: ...81 16 1 3 1 To remove control board 16 1 4 To remove cross flow fan and indoor fan motor ...
Page 82: ...82 ...
Page 84: ...84 17 Technical Data 17 1 Operation Characteristics 17 1 1 CU QE9MKE ...
Page 85: ...85 ...
Page 86: ...86 ...
Page 87: ...87 ...
Page 88: ...88 17 1 2 CU QE12MKE ...
Page 89: ...89 ...
Page 90: ...90 ...
Page 91: ...91 ...