Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting
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Only for training and service purposes
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73
AC input instant over cur-
rent error
(Matter of software)
Inverter PCB input power
current is over 48A(peak)
for 2ms
1. Overload operation (Pipe clogging/Covering/EEV
defect/Ref.overcharge)
2. Compressor damage
(Insulation damage/Motor damage)
3. Input voltage abnormal (L, N)
4. Power line assemble condition abnormal
5. Inverter PCB assembly damage
(input current sensing part)
Display
code
Title Cause of error Check point & Normal condition
■ Error Diagnosis and Countermeasure Flow Chart
No
1.Check Pipe clogging/distortion
2.Check Covering (Indoor/Outdoor Unit)
3.Check EEV connector assemble condition/normal operation
4.Check refrigerant pressure
→ Reassemble or manage if abnormality found
Is installation
condition normal?
Is compressor
Wire connection
condition normal?
1.Check inverter PCB assembly U,V,W connector connection condition
2.Check wire disconnection and wiring
3.Check compressor terminal connection condition(bad contact)
→ Reassemble if abnormality found
Is AC input Wire connection
condition normal?
1.Check L,N connection condition
2.Check wire disconnection and wiring
→ Reassemble if abnormality found
Is inverter PCB assembly
normal?
Yes
No
Recheck power and
installation condition
Yes
Yes
Yes
No
No
Yes
No
Check
L~N phase voltage is 230V ± 15%
→ Check connection condition and wiring if power is abnormal
Is input voltage normal?
Check inverter PCB assembly IPM normality
→ Replace inverter PCB assembly