Service manual

SiBE05-722_C Troubleshooting
Service Diagnosis 77
4.14 Input Overcurrent Detection
Error Code
E8
Method of Error
Detection
An input overcurrent is detected by checking the input current value with the compressor
running.
Error Decision
Conditions

The current exceeds about 9.25 A 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.100
Check No.17
Refer to P.103
Check No.18
Refer to P.103
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.
(R18318)
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.
Correct the power supply or
replace the outdoor unit
PCB.
Any LED off?
Input current flowing
above its stop level?
∗ Inverter analyzer:
RSUK0917C