Input Overcurrent Detection - Daikin FTXN25KEV1B Service Manual

Troubleshooting

4.11 Input Overcurrent Detection

E8
Remote
Controller
Display
Method of An input overcurrent is detected by checking the input current value with the compressor
Malfunction running.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.15
Refer to P.91
Check No.17
Refer to P.92
Check No.18
Refer to P.93
66
The current exceeds about 8.5 ~ 10.5 A for 2.5 seconds with the compressor running.
(The upper limit of the current decreases when the outdoor temperature exceeds a certain
level.)
Defective compressor
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 checker (∗).
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
∗ Inverter checker
Part No.: 1225477
YES
SiBE041102_A
Replace the outdoor unit
PCB.
Correct the power supply or
replace the outdoor unit
PCB.
(R14440)
Service Diagnosis