Service Manual

SiUS121502E Troubleshooting for Outdoor Unit
Service Diagnosis 149
7.10 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 input current is at a certain value (depending on the condition) for 2.5 seconds.

The compressor halts if the error occurs, and restarts automatically after 3-minute standby.
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.171
Check No.17
Refer to P.173
Check No.18
Refer to P.173
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?
Input current flowing
above its stop level?
∗ Inverter analyzer:
RSUK0917C