Input Overcurrent Detection - Daikin CTX Series Service Manual

Troubleshooting

4.14 Input Overcurrent Detection

E8
Error Code
Description

Input Overcurrent Detection

Method of Error An input overcurrent is detected by checking the input current value with the compressor
Detection running.
The current exceeds 10.2 A (depending on the model) for 2.5 seconds with the compressor running.
Error Decision
The upper limit of the current decreases when the outdoor temperature exceeds a certain level.
Conditions
 Outdoor temperature out of operation range
Supposed
 Defective compressor
Causes
 Defective power module
 Defective outdoor unit PCB
 Short circuit
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts
Cautions:
An input overcurrent may result from wrong internal wiring. If the system is interrupted by an
displacement, check the wiring again.
Reference
Check No.17 Refer to P.89
Reference
Check No.18 Refer to P.89
70
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Check No. 17
Check the installation condition.
Start operation and measure the
Input current.
Input current flowing
above its stop level?
YES
Check No. 18
Check the discharge pressure.
may be damaged.
input overcurrent after the wires have been disconnected and reconnected for part
NO
DAMA-SM-21-003
Replace the outdoor
unit PCB (main PCB).
Service Diagnosis