DIY HVAC Tools

Heil mini split error codes

Heil ductless systems come from ICP (Carrier's sister company) and have used two makers. The current DLC/DLF series (DLCSRA, DLCSRB, DLFSHA and related) is Midea-built and uses the Midea code set. The earlier DLC4 / DLF4 series (2013 to 2015) is Gree-built and uses the Gree set, so E1, E5 and F1 mean different things on the two generations.

Covers: DLCSRA / DLCSRB / DLCLRA outdoor with DLFSHA / DLFSFA indoor (2015 and later), DLC4 / DLF4 (2013 to 2015).

Type it exactly as the unit shows it. Not sure which brand? It is printed on the front of the indoor unit.

Most looked-up Heil codes

E1Communication error between indoor and outdoor units / High pressure protectionE5Evaporator coil temperature sensor (T2) open or short circuit / Over-current protectionECRefrigerant leak detected (low refrigerant charge)P4Inverter compressor drive errorF1Outdoor ambient temperature sensor (T4) open or short circuit / Indoor ambient (room) temperature sensor fault (open or short circuit)E6Communication error between indoor and outdoor unitsH6Indoor fan motor not running (no feedback)

All Heil codes

66 codes. Type to filter the list.

CodeMeaningTypeFix
E0Indoor unit EEPROM parameter errorFaultDIY checks
E1DLC/DLF series, 2015 and later (Midea-built): Communication error between indoor and outdoor units
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): High pressure protection		VariesDIY checks
E2DLC/DLF series, 2015 and later (Midea-built): Zero-crossing signal detection error
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Indoor anti-freeze protection		VariesDIY checks
E3DLC/DLF series, 2015 and later (Midea-built): Indoor fan speed out of control (indoor fan motor fault)
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Low pressure protection (refrigerant shortage or blockage)		VariesDIY checks
E4DLC/DLF series, 2015 and later (Midea-built): Indoor room temperature sensor (T1) open or short circuit
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Compressor discharge temperature too high		VariesDIY checks
E5DLC/DLF series, 2015 and later (Midea-built): Evaporator coil temperature sensor (T2) open or short circuit
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Over-current protection		VariesDIY checks
ECRefrigerant leak detected (low refrigerant charge)FaultDIY checks
F0DLC/DLF series, 2015 and later (Midea-built): Overload current protection (compressor over-current)
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Refrigerant shortage or system blockage detected		VariesDIY checks
EBCommunication error between indoor main board and display boardFaultDIY checks
EFIntelligent eye (occupancy sensor) module errorFaultDIY
F1DLC/DLF series, 2015 and later (Midea-built): Outdoor ambient temperature sensor (T4) open or short circuit
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Indoor ambient (room) temperature sensor fault (open or short circuit)		FaultDIY checks
F2DLC/DLF series, 2015 and later (Midea-built): Condenser coil temperature sensor (T3) open or short circuit
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Indoor evaporator coil temperature sensor fault (open or short circuit)		FaultDIY checks
F3DLC/DLF series, 2015 and later (Midea-built): Compressor discharge temperature sensor (TP) open or short circuit
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Outdoor ambient temperature sensor fault (open or short circuit)		FaultDIY checks
F4DLC/DLF series, 2015 and later (Midea-built): Outdoor unit EEPROM parameter error
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Outdoor condenser coil (middle) temperature sensor fault (open or short circuit)		FaultTechnician
F5DLC/DLF series, 2015 and later (Midea-built): Outdoor fan speed out of control (outdoor fan motor fault)
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Compressor discharge temperature sensor fault (open or short circuit)		FaultDIY checks
P0DLC/DLF series, 2015 and later (Midea-built): Inverter module (IPM) malfunction
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): IPM reset (drive module restarted)		ProtectionTechnician
P1Over-voltage or under-voltage protectionProtectionDIY checks
P2High temperature protection (compressor top or inverter module)ProtectionDIY checks
P3Outdoor temperature too low protection (heating lockout)ProtectionDIY
P4Inverter compressor drive errorProtectionTechnician
P5DLC/DLF series, 2015 and later (Midea-built): Mode conflict (multi-zone)
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Compressor current protection		ProtectionDIY
P6DLC/DLF series, 2015 and later (Midea-built): Outdoor low pressure protection
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): Communication error between inverter drive and main controller		VariesDIY checks
dFDefrost cycle runningStatusDIY
CLFilter cleaning reminderStatusDIY
APWi-Fi pairing (access point) modeStatusDIY
E6Communication error between indoor and outdoor unitsFaultDIY checks
E7Mode conflict (multi-zone)ProtectionDIY
E8High temperature protection (overheating)ProtectionDIY checks
E9Indoor unit water-full (drain) protectionProtectionDIY
EEEEPROM (memory) error on a control boardFaultTechnician
FoRefrigerant recovery (pump-down) modeStatusDIY
F6Overload frequency limiting (protection)ProtectionDIY
F8Over-current frequency limiting (protection)ProtectionDIY
F9High discharge temperature frequency limiting (protection)ProtectionDIY
FHAnti-freeze frequency limiting (protection)ProtectionDIY
H1Defrost cycle runningStatusDIY
H3Compressor overload protectionProtectionDIY checks
H4System overload protectionProtectionDIY checks
H5IPM (inverter module) protectionProtectionTechnician
H6Indoor fan motor not running (no feedback)FaultDIY checks
H7Compressor desynchronization (loss of sync)ProtectionTechnician
HCPFC (power factor correction) protectionProtectionTechnician
U7Four-way (reversing) valve faultFaultTechnician
U8Indoor fan (PG motor) zero-crossing detection errorFaultDIY checks
C5Jumper cap malfunction (missing or wrong jumper)FaultDIY checks
PHDC bus high voltage (over-voltage) protectionProtectionDIY checks
PLDC bus low voltage (under-voltage) protectionProtectionDIY checks
LcCompressor start failureProtectionTechnician
LdCompressor phase loss or phase sequence errorProtectionTechnician
LECompressor stall (locked rotor)ProtectionTechnician
LPIndoor and outdoor unit mismatchFaultDIY checks
oEOutdoor unit fault (see outdoor board)FaultTechnician
U5Whole-unit current detection errorFaultTechnician
F7Oil return cycle (cooling)StatusDIY
LAOutdoor DC fan motor errorFaultDIY checks
LFCompressor over-speed protectionProtectionTechnician
P7Inverter heat sink temperature sensor errorFaultDIY checks
P8Inverter heat sink (radiator) overheat protectionProtectionDIY checks
P9AC contactor protectionProtectionTechnician
PcCurrent sensor errorFaultTechnician
PdSensor connection protectionFaultTechnician
PETemperature drift protectionProtectionTechnician
PFDrive board ambient temperature sensor errorFaultDIY checks
PAAC current protectionProtectionDIY checks
PUCharging circuit errorFaultTechnician
PPAC input voltage anomalyProtectionDIY checks

How Heil shows error codes

DLC/DLF series, 2015 and later (Midea-built): The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.

DLC4 / DLF4 series, 2013 to 2015 (Gree-built): The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.

Brands built on the same platform

These brands share a code table with Heil because the same factory builds them, so their pages describe the same faults: ACiQ, AirEase, Arcoaire, Arctic King, Armstrong Air, Blueridge, Bosch, Bryant, Carrier, Comfortmaker, Concord, Cooper & Hunter, Day & Night, Della.

Sources

  • ICP DLCSRA Outdoor Unit Single Zone Ductless Service Manual 32808000801 (error code table)
  • ICP ductless installation instructions IM-KSAIC04-04 (DLCPRA / DLCSRB / DLCERB / DLCLRA error codes)
  • ICP R-410A Ductless Split System Service Manual 421 01 9204 00 (DLC4 / DLF4, 2013)

Updated September 2026. Manufacturer site: www.heil-hvac.com