IM-KSAIC03-03 Specifications subject to change without notice.
13
ERROR CODES
For ease of service, the 24V Interface is equipped with a diagnostic code display LED on the control board (ensure the 24V interface is installed
with the directional arrow pointing up to successfully read the error code). Refer to the indoor or outdoor unit’s service manual as listed in
Table 16 for a troubleshooting breakdown.
Table 16 — Error Codes
Display
Malfunction and Protection Indication
Service Manual Reference
E0
Indoor EEPROM error
Indoor Service Manual
E2
Cross-zero detection error
Indoor or Outdoor Service Manual
E3
Indoor fan speed malfunction
Indoor Service Manual
E4
Indoor room temperature sensor error
Indoor Service Manual
E5
Evaporator coil temperature sensor error
Indoor Service Manual
EC
Refrigerant leak detection system malfunction
Indoor or Outdoor Service Manual
F0
Current overload protection
Outdoor Service Manual
F1
Outdoor ambient temperature sensor (T4) malfunction
Outdoor Service Manual
F2
Condenser coil temperature sensor (T3) malfunction
Outdoor Service Manual
F3
Condenser coil temperature sensor (T5) malfunction
Outdoor Service Manual
F4
Outdoor unit EEPROM parameter error
Outdoor Service Manual
F5
Outdoor fan speed has been out of control
Outdoor Service Manual
F6
T2b sensor error
Indoor or Outdoor Service Manual
P0
Inverter module (IPM) malfunction
Outdoor Service Manual
P1
Over-voltage or under-voltage protection
Outdoor Service Manual
P2
Compressor top high temperature protection (OLP)
Outdoor Service Manual
P3
Low ambient temperature cut off in heating
Outdoor Service Manual
P4
Compressor drive malfunction
Outdoor Service Manual
--
Mode conflict (when connected to a multi-zone)
Indoor Service Manual
P6
Compressor low-pressure protection
Outdoor Service Manual
IN
24V Interface and indoor unit communication malfunction
Indoor Service Manual (E1)
0U
24V Interface (indoor unit) and outdoor unit communication malfunction
Indoor Service Manual (E1)
00
24V Interface successful power up and in standby
Operational Code
01
System operating in cooling mode
Operational Code
02
System operating in heating mode
Operational Code
03
System operating in fan mode
Operational Code
04
System operating in dehumidify mode (not a recommended application for
FV4C units)
Operational Code
05
System operating with Auxiliary heater active (not a recommended application)
Operational Code
