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 Code Solutions
DLFBHC Cassette Ductless System – Sizes 12 – 24
Malfunction Status Table Outdoor Multi−zone Sizes 18 & 24
| Error Codes | Solutions |
|---|---|
| U8 | Zero cross detection circuit malfunction(for indoor unit). Hardware malfunction. |
| C5 | Malfunction protection of jumper cap(for indoor unit). Hardware malfunction. |
| H6 | Feedback of without I DU motor(for indoor unit). Hardware malfunction. |
| F1 | Indoor ambient temperature sensor is open/short circuited. Hardware malfunction. |
| F2 | Indoor evaporator temperature sensor is open/short circuited. Hardware malfunction. |
| b5 | Liquid valve temperature sensor is open/short circuited. Hardware malfunction. |
| b7 | Gas valve temperature sensor is open/short circuited. Hardware malfunction. |
| P7 | Modular temperature sensor is open/short circuited. Hardware malfunction. |
| F3 | Outdoor ambient temperature sensor is open/short circuited. Hardware malfunction. |
| F4 | Outdoor condenser middle pipe temperature sensor is open/short circuited. Hardware malfunction. |
| F5 | Outdoor discharge temperature sensor is open/short circuited. Hardware malfunction. |
| E6 | Communication malfunction. Hardware malfunction. |
| U1 | Malfunction of phase current detection circuit for compressor. Hardware malfunction. |
| P8 | Module high temperature protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| F0 | Refrigerant 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. |
| PU | Charging malfunction of capacitor. Hardware malfunction. |
| E1 | High pressure protection of system. Hardware malfunction. |
| E3 | Low pressure protection of system (reserved). Hardware malfunction. |
| H3 | Compressor overload protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| LP | Indoor unit and outdoor unit do not match. Hardware malfunction. |
| EE | Malfunction of memory chip. Hardware malfunction. |
| dn | Wrong connection of communication wire or malfunction of electronic expansion valve. Hardware malfunction. |
| L3 | Malfunction protection of outdoor fan 1. Hardware malfunction. |
| dd | Detection status of wrong connection of communication wire or malfunction of electronic expansion valve. Operation status. |
| E7 | Mode conflict. Operation status. |
| Fo | Refrigerant recycling mode. Operation status. |
| AL | X-fan. Operation status. |
| H1 | Defrosting or oil return in heating mode. Operation status. |
| Lc | Start failure of compressor. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| E4 | High discharge temperature protection of compressor. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| E8 | Overload protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| E5 | Whole unit over-current protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| P5 | Compressor phase current protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| H7 | Compressor de-synchronizing. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| Ld | Compressor phase-lacking/phase-inverse protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| H5 | IPM modular protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| PL | DC bus-bar low voltage protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| PH | DC bus-bar high voltage protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| HC | PFC protection. Viewing malfunction code through remote controller within 200s; displayed directly on indoor display after 200s. |
| U7 | The 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
| NAME OF MALFUNCTION | YELLOW LIGHT | RED LIGHT | INDOOR DISPLAY |
|---|---|---|---|
| Compressor runs | Flash once | – | – |
| Defrost | Flash twice | – | H1 |
| Anti-freezing protection | Flash 3 times | – | E2 |
| IPM protection | Flash 4 times | – | H5 |
| AC over-current protection | Flash 5 times | – | E5 |
| Over-burden protection | Flash 6 times | H4 | |
| Compressor exhaust high temperature protection | Flash 7 times | E4 | |
| Compressor overload protection | Flash 8 times | H3 | |
| Power protection | Flash 9 times | L9 | |
| EEPROM reads and write protection | Flash 11 times | – | – |
| Low PN voltage protection | Flash 12 times | PL | |
| Limit/decline frequency(electric current) | Flash 1 times | ||
| Frequency limit(exhaust) | Flash 2 times | ||
| Frequency limit(Over-burden) | Flash 3 times | ||
| Outdoor ambient sensor malfunction | Flash 6 times | F3 |
R-410A Two-Stage Split System Air Conditioner Troubleshooting
Product Family: H4A6, C4A6, T4A6 H4A8, C4A8, T4A8
| Status LED | Status LED Description | Status LED Troubleshooting Information |
|---|---|---|
| Green “POWER” | Module has power | Supply voltage is present at module terminals |
| Yellow “ALERT” Flash Code 1 | Long 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 2 | Internal Protector Trip | 1. The internal motor protector has opened, Wait for compressor to cool down, protector will close automatically |
| Yellow “ALERT” Flash Code 3 | Short 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 4 | Locked 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 5 | Open High Voltage Circuit | 1. 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 6 | Open Start Circuit, Current only in run circuit | 1. Run capacitor has failed 2. Open circuit in compressor start wiring or connections 3. Compressor start winding is damaged |
| Yellow “ALERT” Flash Code 7 | Open Run Circuit, Current only in start circuit | 1. Open circuit in compressor run wiring or connections 2. Compressor run winding is damaged |
| Yellow “ALERT” Flash Code 8 | Welded Contactor, Compressor always runs continuous operation | 1. Compressor contactor has failed closed 2. Thermostat demand signal not connected to module |
| Yellow “ALERT” Flash Code 9 | Low Voltage, Control circuit < 17VAC | 1. 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:
- Free flow of air is essential. Keep fences, shrubs, trash cans, and other obstructions at least 18 inches from all coil inlets.
- 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.
- 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.