. Multiple outdoor units control
For other details, refer to "8. Troubleshooting".
Basic Troubleshooting for multiple outdoor units control
No.
Fault symptom
Possible cause
Explanation - Solution
1
Main controller display
is blank.
1.
There is no power supply to main
controller.
1. Check LED2 on the master controller. (See <Figure 5.2.1>.)
(i) When LED2 is lit.
Check for damage or contact failure of the main 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 controller,
however, the display on the main
controller does not appear.
2.
Check the following:
• Disconnection between the main controller cable and the master controller.
• Failure of the main 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
controller.
1.
"Please Wait" is displayed for up to 6
minutes.
1.
Normal operation.
2.
Communication failure between the main
controller and master/slave controller.
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 master/slave
controller.
• Check wiring connections on the main controller.
• Replace the main controller or master/slave controller.
(ii) If “1-49%” is displayed there is a communication error between the outdoor
unit's control board and slave controller.
• Check the wiring connections on the outdoor unit control board and the slave
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 slave controller.
3.
Communication failure between slave
controller and outdoor unit.
3
LED2 on master
controller is off.
(See <Figure 5.2.1>.)
When LED1 on master controller is also off.
(See <Figure 5.2.1>.)
1.
Master 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.
Master controller failure.
3. Check the master controller.
• Check the fuse on the master controller.
• Check for faulty wiring.
• Check Dip SW4-2 is ON.
• If no problem found with the wiring, the master controller is faulty.
4
LED2 on FTC4 is blink-
ing.
(See Figure <5.2.1>)
When LED1 is also blinking on master con-
troller.
Check for faulty wiring between master controllers.
When LED1 on master controller is lit.
1.
Faulty wiring in main controller
Multiple indoor units have been wired to
a single outdoor unit.
1. Check for faulty wiring in main controller.
The number of indoor units that can be wired to a single outdoor unit is one. Ad-
ditional indoor units must be wired individually to a single outdoor unit.
2.
Short-circuited wiring in main controller
2.,3. Remove main controller wires and check LED2 on master controller. (See Fig-
ure 5.2.1.)
• If LED2 is blinking check for short circuits in the main controller wiring .
• If LED2 is lit, wire the main controller again and:
- if LED2 is blinking, the main controller is faulty;
- if LED2 is lit, faulty wiring of the main controller has been corrected.
3.
Main controller failure
4.
Dip SW setting failure
4. Check Dip SW 4-2 on the slave controller is OFF.
Master
controller
Black
YELLOW
YELLOW
BLACK
BLACK
