Service Manual

SiUS091133 Troubleshooting
Service Diagnosis 118
4.15 Input Overcurrent Detection
Remote
Controller
Display
E8
Method of
Malfunction
Detection
An input overcurrent is detected by checking the input current value with the compressor running.
Malfunction
Decision
Conditions
 The current exceeds about 9.25 ~ 20 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.146
Check No.17
Refer to P.149
Check No.18
Refer to P.150
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.
(R14440)
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 checker (∗).
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 checker
Part No.: 1225477