145
Error Codes
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ERROR CODES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
troubleshooting of the Multi V product.
WARNING
Error No. 21, continued.
Measuring the resistance between
each compressor terminal.
Check DC link connections.
R
S
T
* Heat Sink
Screws.
Compressor wiring
connections.
P and N Terminals.
Images here are representative of system
components. Actual component appearance
depends on model and system type.
Cause Check
Checklist
App.
Check Point Normal Abnormal
Defective
Parts
Under Voltage (15V)
15V Voltage Measurement
(Inverter connector)
Voltage 14.5V ~ 15.5V 9Ļ Inverter PCB A2 (Power ON)
Inverter PCB
Damaged
Check Inverter PCB appearance Appearance Good Damage
Inverter PCB B1 (Power Off)
Measure 5V,15V line 5V, 15V Resistance NĹ NĻa
IGBTM (Check IGBT) P-U,V,W / N-U,V,W 0.38V ~ 0.7V Non-normal
Inverter Drive Circuit
(Check diode)
Diode 0.38V ~ 0.7V Non-normal
Table 78: Error No. 21 Checkpoint Details.
Figure 72: Two Compressor Additional Check Procedure (Same Capacity Inverter Only).
Inv.1
- CH21
Inv.2
Comp.1 Comp.2
Inv.1
-CH21
Inv.2
Comp.1 Comp.2
Inv.1
Inv.2
- CH21
Comp.1 Comp.2
Standard Connection.
Example: Inverter 1, CH21
displayed.
If Inverter 2 has CH21 displayed,
then Comp. 1 is defective.
If Inverter 1 consistently displays
CH21, then Inverter 1 is defective.
Cross Connections after Operation.
or
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