Troubleshooting - Mitsubishi Electric SLZ Series Technical & Service Manual

8

TROUBLESHOOTING

8-1. TROUBLESHOOTING
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller or controller board of out-
door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
Unit conditions at service
The trouble is reoccurring.
The trouble is not reoccurring.
8-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
Refer to "13-7. SELF-DIAGNOSIS" to search for the error history.
[Output pattern A]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blinking
Off
pattern
Approx. 2.5 s
Self-check
starts
(Start signal
Number of blinks/beeps in pattern indicates the check
received)
code in the following table (i.e., n=5 for "P5")
[Output pattern B]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blinking
Off
pattern
Approx. 2.5 s
Self-check
starts
(Start signal
received)
TCH118
Check code
Displayed
Not displayed
Logged
Not logged
Beep Beep Beep Beep
1 st 2 nd 3 rd n th
On On On On
0.5 s 0.5 s 0.5 s 0.5 s
Beep Beep Beep
1 st 2 nd
On On On
Approx. 3 s 0.5 s 0.5 s 0.5 s
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for "U2")
Actions to be taken for service (summary)
Judge what is wrong and take a corrective action according
to "8-3. SELF-DIAGNOSIS ACTION TABLE".
Conduct troubleshooting and ascertain the cause of the
trouble according to "8-4. TROUBLESHOOTING
OF PROBLEMS".
1 Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2 Reset check code logs and restart the unit after finishing
service.
3 There is no abnormality in electrical component,
controller board, remote controller, etc.
1 Re-check the abnormal symptom.
2 Conduct troubleshooting and ascertain the cause of
the trouble according to "8-4. TROUBLESHOOTING
OF PROBLEMS".
3 Continue to operate unit for the time being if the cause
is not ascertained.
4 There is no abnormality concerning of parts such as
electrical component, controller board, remote controller, etc.
Beep Beep
1 st 2 nd
· · · Repeated
Off On On
Approx. 2.5 s 0.5 s 0.5 s
Number of blinks/beeps in pattern indicates
the check code in the following table
Beep
3 rd n th
On On Off
0.5 s Approx. 2.5 s
12
.
Beep Beep
1 st
2 nd
· · · Repeated
On On On
Approx. 3 s 0.5 s 0.5 s
Number of blinks/beeps in pattern indicates
the check code in the following table