Mitsubishi Electric PUZ-A12NKA7 Service Manual page 42

10-5. TROUBLESHOOTING OF PROBLEMS
Phenomena
1. Remote controller display does not
work.
2. "PLEASE WAIT" display is remained
on the remote controller.
3. When pressing the remote controller
operation switch the OPERATION
display is appeared but it will be
turned off soon.
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.
5. When operating by the IR wireless
remote controller, beep sound is
heard, however, unit does not start
operating.
OCH636A
Factor
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 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 After cancelling to select function from the remote
controller, the remote controller operation switch will
not be accepted for approx. 30 seconds.
1 T he pair number settings of the IR wireless
remote controller and indoor controller board are
mismatched.
1 N o operation for 2 minutes at most after the power
supply ON.
2 Hand-held remote controller operation is prohibited.
• R emote controlling adaptor is connected to CN32
on the indoor controller board.
• H and-held remote controller operation is prohibited
by centralized controller etc. since it is connected to
MELANS.
3 R efer to factor of phenomena No.2 on previous
page.
1Check 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.
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 C heck 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".
1 Normal operation
1 Check the pair number settings.
1 Normal operation
2 Normal operation
3 C heck the details of phenomena No.2 on
previous page.
42
Countermeasure