Input Overcurrent Detection - Daikin FTX20JV1B Service Manual

Troubleshooting

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 14 A for 2.5 seconds with the compressor running.
(The upper limit of the current decreases when the outdoor temperature exceeds a certain
Conditions
level.)
Supposed
Causes
Troubleshooting
Check No.15
Refer to P.89
Check No.17
Refer to P.91
Check No.18
Refer to P.91
69
Power supply voltage is not as specified.
Outdoor temperature is out of operation range.
Short circuit
Power supply voltage is not as specified.
Defective outdoor unit PCB
Defective compressor
Defective power module
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.
Is the
power supply
voltage fluctuation within
±10% from the rated
value?
YES
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.
NO
NO
∗ Inverter analyzer:
RSUK0917C
YES
SiBE041010EA
Correct the power supply.
Replace the outdoor unit
PCB.
Correct the power supply or
replace the outdoor unit
PCB.
(R18798)
Service Diagnosis