Table of Contents
10-5. Troubleshooting by inferior phenomena
No.
Fault symptom
1
Main controller display
1. There is no power supply to main
is blank.
2. Power is supplied to main controller,
2
"Please Wait" remains
1. "Please Wait" is displayed for up to 6
displayed on the main
controller.
2. Communication failure between the main
3. Communication failure between FTC and
3
The main screen
The main controller operations do not work
appears with a press
for a while after the settings are changed in
of the "ON" button, but
the service menu. This is because the system
disappears in a second.
takes time to apply the changes.
4
LED2 on FTC is off.
When LED1 on FTC is also off. (See 6.
(See 6. WIRING
WIRING DIAGRAM.)
DIAGRAM.)
1. The outdoor unit is not supplied at the
2. Defective outdoor controller circuit board.
3. FTC is not supplied with 220 to 240V AC.
4. FTC failure
5. Faulty connector wiring
OCH570
Possible cause
controller.
however, the display on the main
controller does not appear.
minutes.
controller and FTC.
outdoor unit.
rated voltage.
Explanation - Solution
1. Check LED2 on FTC. (See 6. WIRING DIAGRAM.)
(i) When LED2 is lit.
Check for damage or contact failure of the main controller wiring.
(ii) When LED2 is blinking.
Refer to No. 5 below.
(iii) When LED2 is not lit.
Refer to No. 4 below.
2. Check the following:
• Disconnection between the main controller cable and the FTC control board
• Failure of the main controller if "Please Wait" is not displayed.
• Refer to No. 2 below if "Please Wait" is displayed.
1. Normal operation
2, 3. Main controller start up checks/procedure.
(i) If "0%" or "50-99%" is displayed below "Please Wait" there is a
communication error between the main controller and the FTC control board.
• Check wiring connections on the main controller.
• Replace the main controller or the FTC control board.
(ii) If "1-49%" is displayed there is a communication error between the outdoor
unit's and FTC's control boards.
• Check the wiring connections on the outdoor unit control board and the FTC
control board.
(Ensure S1 and S2 are not cross-wired and S3 is securely wired with no
damage. (See 7. FIELD WIRING.)
• Replace the outdoor unit's and/or the FTC's control boards.
Normal operation
The indoor unit is applying updated settings made in the service menu. Normal
operation will start shortly.
1. Check the voltage across the terminals L and N or L3 and N on the outdoor
power board. (See 7. FIELD WIRING.)
• When the voltage is not 220 to 240V AC, check wiring of the outdoor unit and
of the breaker.
• When the voltage is at 220 to 240V AC, go to "2." below.
2. Check the voltage across the outdoor unit terminals S1 and S2. (See 7. FIELD
WIRING.)
• When the voltage is not 220 to 240V AC, check the fuse on the outdoor
control board and check for faulty wiring.
• When the voltage is 220 to 240V AC, go to "3." below.
3. Check the voltage across the indoor unit terminals S1 and S2. (See 7. FIELD
WIRING.)
• When the voltage is not 220 to 240V AC, check FTC-outdoor unit wiring for
faults.
• When the voltage is 220 to 240V AC, go to "4." below.
4. Check the FTC control board.
• Check the fuse on FTC control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC control board is faulty.
5. Check the connector wiring.
• When the connectors are wired incorrectly, re-wire the connectors referring to
below. (See 7. FIELD WIRING.)
L
Initial settings
N
(Power
White
CN01
supplied by
S1
outdoor unit)
Cylinder unit
S2
control board
S3
52
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Troubleshooting
