Multi Zone Service Manual - General

5. Trouble Shooting
- 69 -
Only for training and service purposes
n Error Diagnosis and Countermeasure Flow Chart
28
Inverter DC link high
voltage error
Inv PCB DC link voltage
supplied over 420V
1. Input voltage abnormal (L~N)
2. ODU inverter PCB damage(DC Link voltage
sensing part)
Display
code
Title Cause of error Check point & Normal condition
Is Inverter PCB assembly
Power connection normal?
Check connection from terminal block to
Inverter PCB assembly CN(L), CN(N)
Yes
Is input voltage normal ?
No
No
Yes
Is Inverter PCB Normal?
No
Replace inverter PCB assembly
Recheck power and installation
condition
Check L~N Voltage is 220V±15%