Troubleshooting
SiBE06-708_A
97
Service Diagnosis
4.12 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 following current with the compressor running continues for 2.5 seconds.
Cooling / Heating: Above 9.25 ~ 20 A (Refer to “Input current control” on page 49 for detail.)
Supposed
Causes
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Troubleshooting
Check No.07
Refer to P.130
Check No.08
Refer to P.130
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 wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an input overcurrent,
take the following procedure.
(R11709)
NO
YES
YES
NO
Start operation and measure the
input current.
Check No. 08
Check the discharge pressure.
Check No. 07
Check the installation condition.
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 PM1.
(Replace the outdoor unit
PCB.)
Any LED off?
Input current flowing
above its stop level?
∗
Inverter checker
Part No.: 1225477
