LG Therma V ZHBW056A0 Service Manual page 102

Display
Title
code
Title
Communication
53
(PCB(Heater) ' PCB(Inverter))
WARNING
Before checking PCB(Inverter) or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby
state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Check Point
1. Check the input power AC 230 V.
2. Check the communication wires are correctly connected.
Adjust the connection of wire Confirm the wire of "Live", "Neutral"
3. Check the resistance between communication line and GND. (Normal : Over 2MΩ)
4. Check the connector for communication is correctly connected.
5. Make sure you have connected to the communication line soldering
(If you do not connect by soldering, a communication error(CH05/CH53) occurs by noise)
Cause of error
• Communication poorly
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Check point & Normal condition
• Power input AC 230V.
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• The communication line is shorted at GND.
• Transmission circuit of PCB(Inverter) is abnormal.
• Transmission circuit of PCB(Heater) is abnormal.
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