Copyright 2020 CMNA
3300 Riverwood Parkway Atlanta GA 30339 32801002001
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code display LEDs on some outdoor units. The outdoor diagnostic display consists
of two LEDs (red and green) on the outdoor unit board and is limited to a few errors. The indoor diagnostic display is a digital readout on the
display panel. If possible, always check the diagnostic codes displayed on the indoor unit first before consulting a service technician. The
diagnostic codes, displayed in the indoor and outdoor units, are listed in Table 19.
Table 19 — Indoor Unit Diagnostic Guides
For additional diagnostic information, refer to the indoor unit service manual.
ADVANCED SERVICE AND INSTALLATION FUNCTIONS
Refer to the service manual of the Wireless Remote Controller for access to advanced function such as:
• Auto-Start Function
• Temperature Compensation
• Filter reminder
• Indoor Fan Motor Speed Control after set temperature is reached
• Lowest or Highest Temperature Setting
• Static Pressure Setting
All changes should be performed
ONLY
by authorized professionals.
RUNNING LED
TIMER LED
DISPLAY
ERROR INFORMATION
--
--
dF
Defrost
--
--
cF
Warming in heating mode
--
--
SC
Self clean
--
--
CL
Clean filter
--
--
nF
Replacing filter
--
--
FP
Heating in room temperature under 46°F(8°C)
--
--
FC
Forced cooling
--
--
AP
AP mode for WIFI setup
--
--
CP
Remote start stop contact is open
--
--
AF
Constant Air Flow
--
--
LL
Remote or Wire controller Lock
--
--
d1
Receive DR1 signal
--
--
d2
Receive DR2 signal
--
--
d3
Receive DR3 signal
--
--
dE
DR input error signal
1 time
OFF
E0
Indoor unit EEPROM parameter error
2 times
OFF
E1
Indoor/outdoor unit communication error
4 times
OFF
E3
The indoor fan speed is operating outside of the normal range
5 times
OFF
E4
Indoor room temperature sensor T1 is in open circuit or has short circuited
6 times
OFF
E5
Evaporator coil middle temperature sensor T2 is in open circuit or has short circuited
7 times
OFF
EC
Refrigerant leakage detection
8 times
OFF
EE
Water-level alarm malfunction
9 times
OFF
E8
Communication error between master and slave unit (for twins system)
10 times
OFF
E9
Another indoor unit malfunction (for twins system)
11 times
OFF
Ed
Outdoor unit malfunction
1 time
ON
F0
Current overload protection
2 times
ON
F1
Outdoor room temperature sensor T4 is in open circuit or has short circuited
3 times
ON
F2
Condenser coil temperature sensor T3 is in open circuit or has short circuited
4 times
ON
F3
Compressor discharge temperature sensor TP is in open circuit or has short circuited
5 times
ON
F4
Outdoor unit EEPROM parameter error
6 times
ON
F5
The outdoor fan speed is operating outside of the normal range
7 times
ON
F6
Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free-
match indoor units)
11 times
ON
FA
Communication error between indoor two chips
1 time
FLASH
P0
IPM malfunction or IGBT over-strong current protection
2 times
FLASH
P1
Over voltage or over low voltage protection
3 times
FLASH
P2
Top temperature protection of compressor
5 times
FLASH
P4
Inverter compressor drive error
6 times
FLASH
--
Indoor units mode conflict (match with multi outdoor unit)
7 times
FLASH
P6
Low pressure protection
8 times
FLASH
P7
IGBT temperature sensor TH is in open circuit or has short circuited
