Input Overcurrent Detection - Daikin Super Multi NX FFQ25B8V1B Service Manual

SiBE121021_C
7.6

Input Overcurrent Detection

E8
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of Detected by checking the input current value
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.15
Refer to P.366
Check No.17
Refer to P.368
Check No.18
Refer to P.368
Service Diagnosis
j h i h
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.
Defective compressor
Defective power transistor
Defective inverter main circuit electrolytic capacitor
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.
i h
5
NO
∗ Inverter checker
Part No.: 1225477
YES
Troubleshooting for Outdoor Unit
Replace the outdoor unit
PCB.
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
(R14411)
339