Mitsubishi Electric PUY-A12NKA7, Service Manual

Page: 42 / 120

42
10-5. TROUBLESHOOTING OF PROBLEMS
Phenomena Factor Countermeasure
1. Remote controller display does not
work.
1
12 V DC is not supplied to remote controller.
(Power supply display is not indicated on LCD.)
2
12–15 V DC is supplied to remote controller, how-
ever, no display is indicated.
• “PLEASE WAIT” is not displayed.
• “PLEASE WAIT” is displayed.
1
Check LED2 on indoor controller board.
(1) When LED2 is lit.
Check the remote controller wiring for
breaking or contact failure.
(2) When LED2 is blinking.
Check short circuit of remote controller
wiring.
(3) When LED2 is not lit.
Refer to phenomena No.3 below.
2
Check the following.
•
Failure of remote controller if “PLEASE
WAIT” is not displayed
• Refer to phenomena No.2 below if “PLEASE
WAIT” is displayed.
2. “PLEASE WAIT” display is remained
on the remote controller.
1
At longest 2 minutes after the power supply “PLEASE
WAIT” is displayed to start up.
2
Communication error between the remote controller
and indoor unit
3
Communication error between the indoor and out-
door unit
4
Outdoor unit protection device connector is open.
1
Normal operation
2
Self-diagnosis of remote controller
3
”PLEASE WAIT” is displayed for 6 minutes
at most in case of indoor/outdoor unit
communication error. Check LED3 on
indoor controller board.
(1) When LED3 is not blinking.
Check indoor/outdoor connecting wire
for miswiring.
(Converse wiring of S1 and S2, or break
of S3 wiring.)
(2) When LED3 is blinking.
Indoor/outdoor connecting wire is
normal.
4
Check LED display on outdoor controller
circuit board. Refer to "10-10. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".
Check protection device connector (63L
and 63H) for contact failure.
Refer to "10-9. TEST POINT DIAGRAM".
3. When pressing the remote controller
operation switch the OPERATION
display is appeared but it will be
turned off soon.
1
After cancelling to select function from the remote
controller, the remote controller operation switch will
not be accepted for approx. 30 seconds.
1
Normal operation
4. Even controlling by the IR wireless
remote controller no beep is heard
and the unit does not start operat-
ing. Operation display is indicated
on IR wireless remote controller.
1
The pair number settings of the IR wireless
remote controller and indoor controller board are
mismatched.
1
Check the pair number settings.
5. When operating by the IR wireless
remote controller, beep sound is
heard, however, unit does not start
operating.
1
No operation for 2 minutes at most after the power
supply ON.
2
Hand-held remote controller operation is prohibited.
• Remote controlling adaptor is connected to CN32
on the indoor controller board.
• Hand-held remote controller operation is prohibited
by centralized controller etc. since it is connected to
MELANS.
3
Refer to factor of phenomena No.2 on previous
page.
1
Normal operation
2
Normal operation
3
Check the details of phenomena No.2 on
previous page.
OCH636A