Compressor Overcurrent - Daikin RXQ12AHR Service Manual

SiAF341904E

5.40 Compressor Overcurrent

Applicable All outdoor unit models
Models
L8
Error Code
Method of Error Detect current flowing through the power transistor.
Detection
Error Decision
(1) The secondary-side inverter current exceeds A (A) for a period of 5 consecutive seconds.
Conditions (2) The secondary-side inverter current exceeds B (A) for a period of 260 consecutive seconds.
Trigger point
JT1GUVDYR
JT16KCVDYR
Supposed
 Compressor overloaded
Causes  Wiring disconnection in compressor coil
 Disconnection of compressor wiring
 Defective inverter PCB
Troubleshooting
Power OFF
Part 6 Service Diagnosis
Compressor model A (A)
21.0
30.0
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check in Monitor Mode
For the models equipped with
2 compressors, check the
compressor M1C or M2C
applicable to the error code L8
while in monitor mode of the
outdoor unit.
Is the stop valve open?
YES
Check for the leads of the
compressor.
• For compressor M1C
• For compressor M2C
Are the
leads of the relevant
compressor
normal?
YES
Are
wiring and wire
connections to the relevant
compressor
normal?
YES
A
B (A)
17.6
27.5
NO
NO
NO
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Troubleshooting by Error Code
Open the stop valve.
Replace the leads of the
relevant compressor.
Rectify the wiring and
wire connections.
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