LG Therma V ZHBW056A0 Service Manual page 90

Display
Title
code
23 DC Link Low Volt
28 DC Link High Volt
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.
n Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
Yes
PCB assembly 1
Power connection normal?
Yes
Is PCB(Inverter) Normal?
Yes
Recheck power and installation
condition
Cause of error
• DC Link Voltage is
below 140 V DC
• DC Link Voltage is
above 420 V DC
No
Check power input voltage
No
Check power connection state
No
Replace PCB assembly 1
- 90 -
Check point & Normal condition
• Check CN_(L), CN_(N) Connection
• Check Input Voltage
• Check PCB DC Link voltage sensor parts
• Check CN_(L), CN_(N) Connection
• Check Input Voltage
• Check PCB DC Link voltage sensor parts
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