Table of Contents
Troubleshooting
28
No. Fault Symptom
1
Main controller display
is blank.
2
"Please Wait" remains
displayed on the main
controller.
3
The main screen
appears with a press
of the "ON" button, but
disappears in a second.
4
LED2 on FTC4 (Master)
is off.
Pre-Plumbed Slimline Cylinder Installation Manual
68
Possible Cause
1. There is no power supply to
main controller.
2. Power is supplied to main
controller, however, the display
on the main controller does not
appear.
1. "Please Wait" is displayed for up to
6 minutes.
2. Communication failure between
the main controller and FTC4
(Master).
3. Communication failure between
FTC4 (Master) and outdoor unit.
The main controller operations do not
work for a while after the settings are
changed in the service menu. This is
because the system takes time to apply
the changes.
When LED1 on FTC4 (Master) is also off.
1. The outdoor unit is not supplied at
the rated voltage.
2. Defective outdoor controller circuit
board.
3. FTC4 (Master) is not supplied with
220 to 240V AC.
4. FTC4 (Master) failure.
5. Faulty connector wiring.
Explanation - Solution
1.
Check LED2 on FTC4 (Master).
(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 FTC4
(Master) 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 FTC4
(Master) control board.
• Check wiring connections on the main controller.
• Replace the main controller or the FTC4 (Master) control board.
(ii)
If "1-49%" is displayed there is a communication error between
the outdoor unit's and FTC4 (Master) control boards.
• Check the wiring connections on the outdoor unit control board
and the FTC4 (Master) control board.
(Ensure S1 and S2 are not cross-wired and S3 is securely wired
with no damage.
• Replace the outdoor unit's and/or the FTC4 (Master) control boards.
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.
• 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.
• 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.
• When the voltage is not 220 to 240V AC, check FTC4 (Master)-
outdoor unit wiring for faults.
• When the voltage is 220 to 240V AC, go to "4." below.
4.
Check the FTC4 (Master) control board.
• Check the fuse on FTC4 (Master) control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC4 (Master) control
board is faulty.
5.
Check the connector wiring.
• When the connectors are wired incorrectly, re-wire the connectors
referring to electrical installation section
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