Troubleshooting
SiBE041010EA
69
Service Diagnosis
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 14 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
Power supply voltage is not as specified.
Outdoor temperature is out of operation range.
Short circuit
Power supply voltage is not as specified.
Defective outdoor unit PCB
Defective compressor
Defective power module
Troubleshooting
Check No.15
Refer to P.89
Check No.17
Refer to P.91
Check No.18
Refer to P.91
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.
(R18798)
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
Correct the power supply.
NO
YES
Is the
power supply
voltage fluctuation within
±10% from the rated
value?
