SiSG121917E
Troubleshooting for Outdoor Unit
Part 6 Service Diagnosis
152
Reference
Reference
Reference
7.11 Input Overcurrent Detection
Error Code
E8
Outdoor Unit LED
Display
A
j
1
h
2
i
3
h
4
i
5
h
Method of Error
Detection
Detected by checking the input current value
Error Decision
Conditions
The current exceeds about 17 ~ 19.25 A (depending on the model) for 2.5 seconds with the
compressor running. The upper limit of the current decreases when the outdoor temperature
exceeds a certain level.
Supposed
Causes
Outdoor temperature is out of operation range.
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Troubleshooting
Check No.15
Refer to P.173
Check No.17
Refer to P.176
Check No.18
Refer to P.176
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input overcurrent
after the wires have been disconnected and reconnected for part replacement, check the wiring again.
(R21863)
NO
YES
YES
NO
Start operation and measure the
input current.
Check No. 18
Check the discharge pressure.
Check No. 17
Check the installation condition.
Check No. 15
Check with the inverter analyzer.
Turn off the power and disconnect
the harnesses U, V, and W.
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Replace the outdoor unit
PCB (main PCB).
Correct the power supply
or replace the outdoor unit
PCB (main PCB).
Any LED off?
Inverter analyzer:
RSUK0917C
Input current flowing
above its stop level?
