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53
Title
Communication
(PCB(Heater) ’ PCB(Inverter))
• Communication poorly
• 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.
Display
code
Title Cause of error Check point & Normal condition
Check Point
1. Check the input power AC230V.
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)
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.
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