Input Overcurrent Detection - Daikin MKS-T Series Service Manual

SiSG121917E

7.11 Input Overcurrent Detection

E8
Error Code
Outdoor Unit LED
A j 1 h 2 i 3 h 4 i 5 h
Display
Method of Error Detected by checking the input current value
Detection
Error Decision
The current exceeds about 17 ~ 19.25 A (depending on the model) for 2.5 seconds with the
Conditions compressor running. The upper limit of the current decreases when the outdoor temperature
exceeds a certain level.
Supposed  Outdoor temperature is out of operation range.
Causes  Defective compressor
 Defective power module
 Defective outdoor unit PCB
 Short circuit
Troubleshooting
Reference
Check No.15 Refer to P.173
Reference
Check No.17 Refer to P.176
Reference
Check No.18 Refer to P.176
Part 6 Service Diagnosis
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.
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)
152