39
OCH751
10-4. TROUBLESHOOTING OF PROBLEMS
Phenomena
Factor
Countermeasure
1. Remote controller display does not
work.
1
12 VDC is not supplied to remote controller.
2
12–15 VDC is supplied to remote controller, however,
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 outdoor
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 the 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.
(Reversed 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 "10-9. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".
Check protection device connector (63H)
for contact failure.
Refer to "10-8. 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 wireless
remote controller, no beep is heard
and the unit does not start operating.
Operation display is indicated on
wireless remote controller.
1
The pair number settings of the wireless remote
controller and indoor controller board are
mismatched.
1
Check the pair number settings.
5. When operating by the 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
Local remote controller operation is prohibited.
• Remote controlling adaptor is connected to CN32 on
the indoor controller board.
• Local remote controller operation is prohibited by
centralized controller etc. since it is connected to
MELANS.
3
Phenomena of No.2
1
Normal operation
2
Normal operation
3
Check the phenomena No.2.
6. Remote controller display works
normally and the unit performs
cooling operation, however, the
capacity cannot be fully obtained.
(The air does not cool well.)
1
Refrigerant shortage
2
Filter clogging
3
Heat exchanger clogging
4
Air duct short cycle
1
•
If refrigerant leaks, discharging
temperature rises and LEV opening
increases. Inspect leakage by checking
the temperature and opening.
•
Check pipe connections for gas leakage.
2
Open intake grille and check the filter.
Clean the filter by removing dirt or dust
on it.
3
•
If the filter is clogged, indoor pipe
temperature rises and discharging
pressure increases. Check if heat
exchanger is clogged by inspecting
discharging pressure.
•
Clean the heat exchanger.
4
Remove the blockage.
