Heil Air Conditioner Error Codes



This unit has on−board diagnostics. Error codes are displayed on the wired remote controller and the outdoor unit microprocessor board with colored LED lights. Table 9 explains the error codes on both.

Heil Air Conditioner Error Codes
Heil Air Conditioner Error Codes

DLFBHC Cassette Ductless System – Sizes 12 – 24

Malfunction Status Table Outdoor Multi−zone Sizes 18 & 24

Error CodesSolutions
U8Zero cross detection circuit malfunction(for indoor unit). Hardware malfunction.
C5Malfunction protection of jumper cap(for indoor unit). Hardware malfunction.
H6Feedback of without I DU motor(for indoor unit). Hardware malfunction.
F1Indoor ambient temperature sensor is open/short circuited. Hardware malfunction.
F2Indoor evaporator temperature sensor is open/short circuited. Hardware malfunction.
b5Liquid valve temperature sensor is open/short circuited. Hardware malfunction.
b7Gas valve temperature sensor is open/short circuited. Hardware malfunction.
P7Modular temperature sensor is open/short circuited. Hardware malfunction.
F3Outdoor ambient temperature sensor is open/short circuited. Hardware malfunction.
F4Outdoor condenser middle pipe temperature sensor is open/short circuited. Hardware malfunction.
F5Outdoor discharge temperature sensor is open/short circuited. Hardware malfunction.
E6Communication malfunction. Hardware malfunction.
U1Malfunction of phase current detection circuit for compressor. Hardware malfunction.
P8Module high temperature protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
F0Refrigerant lacking or blockage protection of system (not available for residential ODU). Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
PUCharging malfunction of capacitor. Hardware malfunction.
E1High pressure protection of system. Hardware malfunction.
E3Low pressure protection of system (reserved). Hardware malfunction.
H3Compressor overload protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
LPIndoor unit and outdoor unit do not match. Hardware malfunction.
EEMalfunction of memory chip. Hardware malfunction.
dnWrong connection of communication wire or malfunction of electronic expansion valve. Hardware malfunction.
L3Malfunction protection of outdoor fan 1. Hardware malfunction.
ddDetection status of wrong connection of communication wire or malfunction of electronic expansion valve. Operation status.
E7Mode conflict. Operation status.
FoRefrigerant recycling mode. Operation status.
ALX-fan. Operation status.
H1Defrosting or oil return in heating mode. Operation status.
LcStart failure of compressor. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
E4High discharge temperature protection of compressor. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
E8Overload protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
E5Whole unit over-current protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
P5Compressor phase current protection.
Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
H7Compressor de-synchronizing. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
LdCompressor phase-lacking/phase-inverse protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
H5IPM modular protection.
Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
PLDC bus-bar low voltage protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
PHDC bus-bar high voltage protection.
Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
HCPFC protection.
Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.
U7The four-way valve is abnormal.
Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s.

Malfunction Status Table Outdoor Multi−zone Sizes 30, 36, & 42




Malfunction Status Table Outdoor Multi−zone Sizes 30, 36, & 42
Malfunction Status Table Outdoor Multi−zone Sizes 30, 36, & 42
NAME OF MALFUNCTIONYELLOW LIGHTRED LIGHTINDOOR DISPLAY
Compressor runsFlash once--
DefrostFlash twice-H1
Anti-freezing protectionFlash 3 times-E2
IPM protectionFlash 4 times-H5
AC over-current protectionFlash 5 times-E5
Over-burden protectionFlash 6 timesH4
Compressor exhaust high temperature protectionFlash 7 timesE4
Compressor overload protectionFlash 8 timesH3
Power protectionFlash 9 timesL9
EEPROM reads and write protectionFlash 11 times--
Low PN voltage protectionFlash 12 timesPL
Limit/decline frequency(electric current) Flash 1 times
Frequency limit(exhaust)Flash 2 times
Frequency limit(Over-burden)Flash 3 times
Outdoor ambient sensor malfunctionFlash 6 times F3

R-410A Two-Stage Split System Air Conditioner Troubleshooting

R-410A Two-Stage Split System Air Conditioner Troubleshooting
R-410A Two-Stage Split System Air Conditioner Troubleshooting

Product Family: H4A6, C4A6, T4A6 H4A8, C4A8, T4A8

Status LEDStatus LED DescriptionStatus LED Troubleshooting Information
Green “POWER”Module has powerSupply voltage is present at module terminals
Yellow “ALERT” Flash Code 1Long Run Time Compressor is running extremely long run cycles (18 hours or more)1. Low refrigerant charge 2. Evaporator blower is not running 3. Evaporator coil is frozen 4. Faulty metering device 5. Condenser coil is dirty 6. Liquid line restriction (filter drier blocked) 7. Compressor high-stage cooling wiring 8. Thermostat is malfunctioning
Yellow “ALERT” Flash Code 2Internal Protector Trip 1. The internal motor protector has opened, Wait for compressor to cool down, protector will close automatically
Yellow “ALERT” Flash Code 3Short Cycling Compressor is running only briefly (1-3 minutes)1. Thermostat demand signal is intermittent 2. High head pressure 3. Condenser coil poor air circulation (dirty, blocked, damaged) 4. Condenser fan is not running 5. Return air duct has substantial leakage 6. Low pressure switch open, see Flash Code 1 information
Yellow “ALERT” Flash Code 4Locked Rotor 1. Run capacitor has failed 2. Low line voltage (contact utility if voltage at disconnect is low, below 187v) 3. Excessive liquid refrigerant in compressor 4. Compressor bearings are seized
Yellow “ALERT” Flash Code 5Open High Voltage Circuit1. Outdoor unit power disconnect is open 2. Compressor circuit breaker or fuse(s) is open 3. Compressor contactor has failed open 4. Open circuit in compressor supply wiring or connections 5. Unusually long compressor protector reset time due to extreme ambient temperature 6. Compressor windings are damaged
Yellow “ALERT” Flash Code 6Open Start Circuit, Current only in run circuit1. Run capacitor has failed 2. Open circuit in compressor start wiring or connections 3. Compressor start winding is damaged
Yellow “ALERT” Flash Code 7Open Run Circuit, Current only in start circuit1. Open circuit in compressor run wiring or connections 2. Compressor run winding is damaged
Yellow “ALERT” Flash Code 8Welded Contactor, Compressor always runs continuous operation1. Compressor contactor has failed closed 2. Thermostat demand signal not connected to module
Yellow “ALERT” Flash Code 9Low Voltage, Control circuit < 17VAC1. Control circuit transformer is overloaded 2. Low line voltage (contact utility if voltage at disconnect is low)

Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.

TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.




Cleanliness

These tips will help keep the air conditioner looking better and working more efficiently:

  1. Free flow of air is essential. Keep fences, shrubs, trash cans, and other obstructions at least 18 inches from all coil inlets.
  2. Keep the coil free of grass clippings, leaves, weeds, and other debris. NOTE: Coil may occasionally require cleaning with a liquid solution. The coil must be cold when cleaning. Use an alkaline based cleaner only. Cleaning a hot coil or using an acid based cleaner will remove the paint from the fins and may clog the coil.
  3. Never use a weather cover over the outdoor unit unless it is a ventilated type or made of breathable fabric that will allow moisture to evaporate rapidly. A cover that holds moisture in the unit will cause more rust build-up and damage than normal exposure to weather.

R-410A Two-Stage Split System Air Conditioner PDF




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