Trouble shooting 72
Indoor Unit - No Power
(Except wall mounted type)
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Component defective
Is not the breaker down?
Check Point 1 : Power supply
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line (Neon bulb or electric equipment that may
cause harmonic wave).
Check the complete insulation of grounding.
OK
4-2-10 TROUBLE SHOOTING NO ERROR CODE
Is not open circuit ?
If the fuse was open state, check the cause of short circuit
on the AC circuit before replacing the spare parts.
Check Point 2 : Fuse of Indoor unit
NG (Short circuit on AC circuit)
Check on short circuit state step by step
1. Disconnect AC input wire on the terminal board.
2. Disconnect Drain pump AC input connector
3. Disconnect FAN motor AC input connector
Check Point 3 : Short circuit check on AC circuit
NG (Short circuit on AC circuit)
Replace power supply PCB
Check Resistor R101, Open / Short circuit check
Check Point 4 : Resistor R101
Disconnect CN 4 (DC power supply) , and check short circuit
between the pin No. 1 and the pin No.6 step by step
1. Disconnect EEV connector
2. Disconnect SP motor
3. Disconnect Wired Remote Controller
4. Disconnect Transmission PCB
Check Point 6 : Short circuit check on DC13.5V circuit
Disconnect CN 4 (DC power supply) , and check short circuit
between the pin No. 2 and the pin No.6 step by step
1. Disconnect Indicatopr PCB
2. Disconnect SW PCB
3. Disconnect Transmission PCB
Check Point 7 : Short circuit check on DC5.0V circuit
NG (Open circuit on R101)
OK
OK (Not Open )
3.3 Ohm + 5%
ReplaceMain PCB
Disconnect CN102 and check short circuit step by step.
1. Check short circuit between the pin No. 1 and the pin No.6
2. Check short circuit between the pin No. 2 and the pin No.6
Check Point 5 : Short circuit check on DC supply circuit
NG (Short circuit ) OK (Open circuit )
OK (Open circuit)
NG (Short circuit )
NG (Short circuit )
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04-81
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