III - 10
Service Procedures
3
SM830063
1. Troubleshooting
1-4. Alarm Messages on the Outdoor PCB
(In ordinary use, the outdoor alarm LED (yellow) is off and the LED (red), which indicates the number of connected
indoor units, is turned on.)
Alarm messages indicated by the LED (red) on the outdoor PCB.
●
When the outdoor alarm LED (yellow) is OFF, the LED (red) lamps blink
Thermostat OFF run, with no alarm
display on the remote controller.
●
When the outdoor alarm LED (yellow) is ON, LED (red) lamps light up
An alarm message is also displayed
on the remote controller.
O
: light - up / blink
Remote
controller
display
Possible cause of fault
LED (red)
Connected indoor units’ No.
of LED (red) lamps blink or
all lamps turned off
When turning on the power supply, No. of indoor units connected is not
correspond with set No. of S004 (except R.C. No. setting is 0).
8
7
6
5
4
3
2
1
E4
E6
O
O O
Serial signal receiving
fault
E7
O
O O O
Serial signal sending fault
E15
O
O O O O
E16
O
O
P2
O O O
O
Protective device activated
P3
O O O
O O
Incorrect discharge temp.
P4
O O O
O
High-pressure switch
P5
O O O
O
O
Protective device
activated
F4
O O
O
Sensor fault
F5
O O
O
O
F6
O O
O O
F7
O O
O O O
F8
O O
O
P17
O O O O
O
Incorrect discharge gas temp. of AC comp.
H1
O
O
PC comp.
H2
O
O
CT detection current
H11
O
O
O O
AC comp.
H12
O
O O
CT detection current
H9
O
O
O
Comp. contactor protection
H19
O
O
O O
Comp. contactor protection
L4
O O
O
Outdoor unit address (R.C. No.) is duplicated.
Serial signal receiving fault
Indoor/outdoor unit combination fault
(incorrect indoor unit count : S004 setting)
Serial signal sending fault
During Auto. address setting, alarm LED
(yellow) lamp lights up. The LED (red) lamps
light up or blink when CN25 (2 pin plug,
white) is shortened.
Fan motor protection thermostat
PC comp. protection thermostat
AC comp. thermostat
Defective phase
PC comp.
PC comp. or AC comp.
Negative phase protector or defective phase
protector, or Voltage drop protector
Discharge temp. A (PC comp.)
Discharge temp. B (AC comp.)
Outdoor coil gas temp. (C2)
Outdoor coil liquid temp. (C1)
Outdoor air suction temp.
Error in Current value (overload)
Error in Current value (lock)
Error in Current value (overload)
Error in Current value (lock)
PC (AC) comp. contactor is chattering.
AC comp. contactor is chattering.
The number of connected
indoor units are less than the
set number in the outdoor PCB.
The number of connected
indoor units are more than the
set number in the outdoor PCB.
NOTE
●
PC comp. : Power Control Compressor
●
AC comp. : Standard Compressor
●
temp. : Temperature
