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10-5. Troubleshooting by inferior phenomena
No.
Fault symptom
1. There is no power supply to main controller.
1
Main controller display
does not work.
. Power is supplied to main controller,
"Please Wait" remains
1. "Please Wait" is displayed for up to 6 mins.
. Communication failure between the main
displayed on the main
controller.
3. Communication failure between FTC3 and
When pressing the
If whilst changing the settings in the service
3
menu, the system is shut down.
"ON" button, the main
screen is shown briefly
When you return to the main screen you may have
to wait a short while before the "ON" button will work.
then disappears.
4
LED on FTC3 is off.
When LED1 on FTC3 is also off.
<FTC3 powered via outdoor unit.>
1. Power supply of rated voltage is not supplied
. Defective outdoor controller circuit board.
3. Power supply of AC 220~240V is not
4. Defective FTC3.
5. There are problems in the method of
<FTC3 powered from independent source>
1. Power supply of AC 220~240V is not
. There are problems in the method of
3. Defective FTC3.
When LED1 on FTC3 is lit.
Possible cause
however, the display on the main controller
is not visible.
controller and FTC3.
outdoor unit.
to outdoor unit.
supplied to FTC3.
connecting the connectors.
supplied to FTC3.
connecting the connectors.
Miss-setting of refrigerant address for
outdoor unit.
(None of the refrigerant address is set to "0".)
1.
Check LED on FTC3.
(i) When LED2 is lit.
Check the main controller wiring for damage or contact failure.
(ii) When LED2 is blinking.
Refer to No.5 below.
(iii) When LED2 is not lit.
Refer to No.4 below.
Check the following.
.
• Failure of main controller if " Please Wait" is not displayed.
• Refer to No.2 below if "Please Wait" is displayed.
1.
Normal operation.
, 3. Main controller start up checks/procedure.
(i) If main controller - FTC3 can not communicate the number displayed
under "Please Wait" is 0%, or 50-99%.
• Check wiring connections on main controller
• Replace main controller or FTC3 boards.
(ii) If 1-49% is displayed there is a communication errorbetween the outdoor
unit's and FTC3's boards.
• Check the wiring connections on the outdoor unit and FTC3 boards.
(Ensure S1, S2 are not cross wired and S3 is securely connected and not
damaged.)
• Replace the outdoor unit's and/or the FTC3's boards.
Normal operation.
The unit is processing the recent service menu changes and will be operational
shortly.
1. Check the voltage of outdoor power supply terminal block (L,N) or (L3,N).
• When AC220~240V is not detected, check the power wiring to outdoor
unit and the breaker.
• When AC 220~240V is detected, check 2 (below).
. Check the voltage between outdoor terminal block S1 and S2.
• When AC 0~40V is not detected, check the fuse on outdoor controller
circuit board, check the wiring connection.
• When AC 220~240V is detected, check 3 (below).
3. Check the voltage between indoor terminal block S1 and S2.
• When AC 220~240V is not detected, check FTC3/outdoor unit connecting
wire for miswiring.
• When AC 220~240V is detected, check 4 (below).
4. Check the fuse on FTC3.
• Check the wiring conection.
If no problems are found, FTC3 board is defective.
Check that there is no problem in the method of connecting the connectors.
5.
• When there are problems in the method of connecting the connectors,
connect the connector correctly referring to below.
L
N
FTC3 powered
via outdoor unit.
S1
S2
S3
1. Check the voltage of indoor power supply terminal block (L,N).
• When AC220~240V is not detected, check the power supply wiring.
• When AC220~240V is detected, check 2 (below).
Check that there is no problem in the method of connecting the connectors.
.
• When there are problems in the method of connecting the connectors,
connect the connector correctly referring to below.
L
N
FTC3 powered
from independednt
S1
source.
S2
S3
• When there is no problem in the method of connecting the connectors,
check 3 (below).
3. Check the fuse on FTC3.
• Check the wiring connection.
If no problems are found, FTC3 board is defective.
Recheck the refrigerant address setting on the outdoor unit.
Set the refrigerant address to "0".
(Set refrigerant address using SW1(3~6) on outdoor controller circuit board.)
49
Explanation - Solution
Black
CNO1
Cylinder unit
control board
Black
CNO1
Cylinder unit
control board
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