Input Overcurrent Detection - Daikin FTXM-K Series Service Manual

SiBE041434E

4.14 Input Overcurrent Detection

E8
Error Code
Method of Error An input overcurrent is detected by checking the input current value with the compressor
running.
Detection
Error Decision The current exceeds about 9.25 ~ 10 A (depending on the model) for 2.5 seconds with the
compressor running.
Conditions
(The upper limit of the current decreases when the outdoor temperature exceeds a certain
level.)
Supposed
Causes
Troubleshooting
Check No.15
Refer to P.101
Check No.17
Refer to P.103
Check No.18
Refer to P.104
Service Diagnosis
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.
FU3
NO
Is the fuse ( ) blown?
YES
∗ Inverter analyzer:
RSUK0917C
YES
Troubleshooting
NO
Replace the outdoor unit
PCB (main PCB and filter
PCB).
Replace the fuse.
Correct the power supply or
replace the outdoor unit
PCB (main PCB).
(R20437)
82