SiUS04-924 Troubleshooting
Service Diagnosis 85
4.12 Input Overcurrent Detection
Remote
Controller
Display
E8
Method of
Malfunction
Detection
An input overcurrent is detected by checking the input current value being detected by CT with the
compressor running.
Malfunction
Decision
Conditions
The following CT input with the compressor running continues for 2.5 seconds.
CT input : Above 20 A
The system will be shut down if the error occurs 16 times.
Clearing condition : Continuous run for about 5 minutes (normal)
Supposed
Causes
Overcurrent due to compressor failure
Overcurrent due to defective power transistor
Overcurrent due to defective inverter main circuit electrolytic capacitor
Overcurrent due to defective outdoor unit PCB
Error detection due to outdoor unit PCB
Overcurrent due to short-circuit
Troubleshooting
Check No.07
Refer to P.109
Check No.08
Refer to P.109
(R9298)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
* 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 over-current,
check the wires again.
NO
YES
YES
NO
Get restarted 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 get restarted.
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
To Next Page
Loading...
