27
10-3. TROUBLESHOOTING OF PROBLEMS
Phenomena
Factor
Countermeasure
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.
1
After cancelling to select function from the remote
controller, the remote controller operation switch will
be not accepted for approx. 30 seconds.
1
Normal operation
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
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.
1
Normal operation
2
Self-diagnosis of remote controller
3
”PLEASE WAIT” is displayed for 6 min
-
utes 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 "10-7. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".
Check protection device connector (63H)
for contact failure.
Refer to "10-6. TEST POINT DIAGRAM".
4. Remote controller display works
normally and the unit performs
cooling operation, however, the
capacity cannot be fully obtained.
1
Refrigerant shortage
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.
5. Remote controller display works
normally and the unit performs
heating operation, however, the
capacity cannot be fully obtained.
1
Linear expansion valve fault
Opening cannot be adjusted well due to linear
expansion valve fault.
2
Refrigerant shortage
3
Lack of insulation for refrigerant piping
4
Bypass circuit of outdoor unit fault
1
•
Discharging temperature and indoor
heat exchanger temperature does not
rise.
Inspect the failure by checking
discharging pressure.
•
Replace linear expansion valve.
2
•
If refrigerant leaks, discharging
temperature rises and LEV opening
increases. Inspect leakage by checking
the temperature and opening.
•
Check pipe connections for gas leakage.
3
Check the insulation.
4
Check refrigerant system during operation.
6.
1
For 3 minutes after temperature
adjuster turns off, the compressor
will not start operating even if
temperature adjuster is turned on.
2
For 3 minutes after temperature
adjuster turns on, the compressor
will not stop operating even if
temperature adjuster is turned off.
(Compressor stops operating
immediately when turning off by
the remote controller.)
12
Normal operation
(For protection of compressor)
12
Normal operation
OCH583
