Input Overcurrent Detection - Daikin 4MXS-R Series Service Manual

SiUS121736EA

7.10 Input Overcurrent Detection

E8
Error Code
j
Outdoor Unit LED
A
Display
Method of Error Detected by checking the input current value
Detection
Error Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.15
Refer to P.214
Check No.17
Refer to P.216
Check No.18
Refer to P.216
Service Diagnosis
h i h i
1 2 3 4
The input current is at a certain value (depending on the condition) for 2.5 seconds.
The compressor halts if the error occurs, and restarts automatically after 3-minute standby.
Outdoor temperature is out of operation range.
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Be sure to turn off the power switch before connecting or disconnecting
Caution 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.
Check No. 17
Check the installation condition.
Start operation and measure the
input current.
Input current flowing
above its stop level?
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
Any LED off?
NO
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check No. 18
Check the discharge pressure.
h
5
NO
∗ Inverter analyzer:
RSUK0917C
YES
Troubleshooting for Outdoor Unit
Replace the outdoor unit
PCB (main PCB).
Correct the power supply or
replace the outdoor unit
PCB (main PCB).
(R21863)
192