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9. Multiple outdoor units control
Basic Troubleshooting for multiple outdoor units control
No.
Fault symptom
Possible cause
Explanation - Solution
1 Main remote controller
display is blank.
1. There is no power supply to main remote
controller.
1. Check LED2 on the FTC main controller. (See <Figure 4.5.1>.)
(i) When LED2 is lit.
Check for damage or contact failure of the main remote controller wiring.
(ii) When LED2 is blinking.
Refer to No. 4 below.
(iii) When LED2 is not lit.
Refer to No. 3 below.
2. Power is supplied to the main remote
controller, however, the display on the
main remote controller does not appear.
2. Check the following:
• Disconnection between the main remote controller cable and the FTC main controller.
• Failure of the main remote controller if “Please Wait” is not displayed.
• Refer to No. 2 below if “Please Wait” is displayed.
2 “Please Wait” remains
displayed on the main
remote controller.
1.
"Please Wait" is displayed for up to 6
minutes.
1. Normal operation.
2. Communication failure between the main
remote controller and FTC main/sub
controller.
2, 3. Main remote controller start up checks/procedure.
(i) If “0%” or “50-99%” is displayed below "Please Wait" there is a communication error
between the main remote controller and the FTC main/sub controller.
• Check wiring connections on the main remote controller.
• Replace the main remote controller or FTC main/sub controller.
(ii) If “1-49%” is displayed there is a communication error between the outdoor unit's
control board and FTC sub controller.
• Check the wiring connections on the outdoor unit control board and the FTC sub
controller.
(Ensure S1 and S2 are not cross-wired and S3 is securely wired with no damage.
(See section 4.5.)
• Replace the outdoor unit's control board and/or the sub controller.
3. Communication failure between FTC sub
controller and outdoor unit.
3 Warning symbol is
displayed on the main
remote controller.
Sub unit failure
1. Press CONFIRM button on the main remote controller while the warning symbol is
displayed.
2. Check the error details.
4 LED2 on FTC main
controller is off.
(See <Figure 4.5.1>.)
When LED1 on FTC main controller is also off.
(See <Figure 4.5.1>.)
1. FTC main controller is not supplied with
220 to 240V AC.
1. Check the voltage across the L and N terminals on the indoor power supply terminal
block. (See section 4.5.)
• When the voltage is not 220 to 240V AC, check for faulty wiring to power supply.
• When the voltage is 220 to 240V AC, go to 2. below.
2. There are problems in the method of
connecting the connectors.
2. Check for faulty wiring between the connectors.
• When the connectors are wired incorrectly re-wire them correctly referring to below.
(See section 4.5 and a wiring diagram on the control and electrical box cover.)
L
N
CN01
CN01
S1
S2
S3
• If no problem found with the wiring, go to 3. below.
3. FTC main controller failure
3. Check the FTC main controller.
• Check the fuse on the FTC main controller.
• Check for faulty wiring.
• Check Dip SW4-2 is ON.
• If no problem found with the wiring, the FTC main controller is faulty.
5 LED2 on FTC is blink-
ing.
(See Figure <4.5.1>.)
When LED1 is also blinking on FTC main
controller.
Check for faulty wiring in FTC main controller.
When LED1 on FTC main controller is lit.
1. Faulty wiring in main remote controller
Multiple indoor units have been wired to
a single outdoor unit.
1. Check for faulty wiring in main remote controller.
The number of indoor units that can be wired to a single outdoor unit is one. Additional
indoor units must be wired individually to a single outdoor unit.
2. Short-circuited wiring in main remote
controller
2.,3. Remove main remote controller wires and check LED2 on FTC main controller. (See
Figure 4.5.1.)
• If LED2 is blinking check for short circuits in the main remote controller wiring.
• If LED2 is lit, wire the main remote controller again and:
- if LED2 is blinking, the main remote controller is faulty;
- if LED2 is lit, faulty wiring of the main remote controller has been corrected.
3. Main remote controller failure
4. Dip SW setting failure
4. Check Dip SW 4-2 on the FTC sub controller is OFF.
6 Main remote controller
communication failure
E0/E4
E3/E5
1. Connection failure of the earth cable
1. Electrical connection (FTC powered via outdoor unit)
• Check for looseness or breakage of the earth cables of outdoor units.
• Daisy-chain the outdoor units with earth cables and earth them with one of the cables.
Electrical connection (FTC powered via independent source)
• Check for looseness or breakage of the earth cables of FTC units.
• Daisy-chain the FTC units with earth cables and earth them with one of the cables.
2. Incorrect wiring of main remote controller.
2. The main remote controller must NOT be wired to FTC sub controller.
For other details, refer to "8. Troubleshooting".
en
FTC
(main)
Black
YELLOW
YELLOW
BLACK
BLACK
Summary of Contents for PAC-SIF051B-E
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