SiAF341904E
Troubleshooting by Error Code
Part 6 Service Diagnosis
247
5.40 Compressor Overcurrent
Applicable
Models
All outdoor unit models
Error Code
L8
Method of Error
Detection
Detect current flowing through the power transistor.
Error Decision
Conditions
(1) The secondary-side inverter current exceeds
A
(A) for a period of 5 consecutive seconds.
(2) The secondary-side inverter current exceeds
B
(A) for a period of 260 consecutive seconds.
Trigger point
Supposed
Causes
Compressor overloaded
Wiring disconnection in compressor coil
Disconnection of compressor wiring
Defective inverter PCB
Troubleshooting
Compressor model
A
(A)
B
(A)
JT1GUVDYR
21.0
17.6
JT16KCVDYR
30.0
27.5
Power OFF
Open the stop valve.
YES
NO
Is the stop valve open?
YES
YES
Are
wiring and wire
connections to the relevant
compressor
normal?
Rectify the wiring and
wire connections.
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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.
Check in Monitor Mode
Check for the leads of the
compressor.
• For compressor M1C
• For compressor M2C
Are the
leads of the relevant
compressor
normal?
Replace the leads of the
relevant compressor.
NO
A
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