Troubleshooting - Mitsubishi Electric Mr.Slim PLA-ZP50EA Service Manual

9

TROUBLESHOOTING

9-1. 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.
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
<
Self-check>
B
3
5
OCH625
Check code
Displayed
Not displayed
Logged
Not logged
1. Press the button 1 to stop the air conditioner.
• If the weekly timer is enabled (
2. Press the button 2 for 5 seconds.
A
• A comes on and the unit enters the self-check mode.
3. Press the button 5 to select the refrigerant address (M-NET address) B of the indoor unit for
which you want to perform the self-check.
4. Press the button 4.
• If an error is detected, the check code is indicated by the number of beeps from the indoor unit
and the number of blinks of the OPERATION INDICATOR lamp.
5. Press the button 1.
1
• A and the refrigerant address (M-NET address) B go off and the self-check is completed.
2
4
17
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.
is on), press the button 3 to disable it ( is off).