Air Conditioning (Rooftop) error codes

112 codes from 11 manufacturers, each with its meaning and the document it comes from. Open a code for the details, or search every system.

Coleman Mach (Mechanical) (4)

• NO OPERATIONAC doesn't respond to thermostat. Usually 120V supply or breaker.
• FAN NO COMPFan operates but compressor doesn't start. Usually capacitor or thermal overload.
• COMP NO FANCompressor operates but fan motor not spinning. Usually fan capacitor or motor.
• POOR COOLINGBoth fan and compressor run but cooling is weak. Usually airflow restriction, dirty coil, or low refrigerant.

Coleman-Mach (2)

• HP LOCKOUTR-410A heat pump high-pressure lockout circuit tripped. Compressor stays locked until 115 VAC supply is…
• HP REVERSINGHeat pump cools when heat is called. Reversing valve solenoid or wiring fault — slide is not reversing…

Coleman-Mach Everest VS-18 (9)

• E1Room Temperature Sensor Fault - the room temperature sensor inside the ACTH3 wall thermostat is damaged or…
• E2Indoor Coil Temperature Sensor Fault - the ICT sensor on the evaporator coil is damaged or has poor contact
• E3External Environment Temperature Sensor Fault - the ambient outdoor-air sensor is damaged or has poor contact
• E4Outdoor Coil Temperature Sensor Fault - the OCT sensor on the condenser coil is damaged or has poor contact
• E5Compressor Discharge Temperature Sensor Fault - the discharge sensor at the compressor outlet is damaged or…
• E7Compressor Discharge Temperature Exceeded 110 degC (230 degF) - outdoor coil is blocked or refrigerant is…
• E8Indoor Coil Temperature Below -12 degC (10.4 degF) - indoor coil is blocked; recovery threshold +7 degC (44.6…
• E9Communication Fault Between the ACTH3 Thermostat and the Main Control Board - interface circuit is damaged…
• dECompressor Driver Fault - check wires connecting to the compressor driver or the compressor; if no loose…

Dometic CCC2 (9)

• E1Loss of communication between the CCC2 thermostat and one or more control boards. The affected control board…
• E2Open or out-of-range indoor temperature sensor. Heat, cool, and dehumidify lock out on the affected zone…
• E3Shorted indoor temperature sensor. Heat, cool, and dehumidify lock out on the affected zone; manual fan still…
• E4Open or out-of-range outdoor temperature sensor (heat-pump models). Heat-pump and dehumidify lock out; A/C…
• E5Open or out-of-range freeze sensor. A/C and dehumidify lock out; heat pump, furnace, heat strip, and fan…
• E6Open-circuit humidity sensor (fitted only on select multi-zone CCC2 systems). Air conditioner and…
• E7Loss of 120 VAC power. All 120 VAC relays switch off after a 120-second delay (which allows for automatic…
• E8Invalid zone configuration - the heat pump AND heat strip DIP switches are both set ON in one zone (an…
• E9Invalid zone configuration - the dehumidifier DIP switch and either the heat pump or heat strip DIP switch…

Dometic FreshJet 7 48V (21)

• P1Under-voltage protection: input voltage below 41 V +-1 V. Clears when input voltage rises above 45 V; the…
• P2Over-current protection: running current exceeds the limit value. The system recovers automatically and…
• P3Over-voltage protection: input voltage over 61 V +1 V. Clears when input voltage falls below 57 V…
• P4Discharge over-temperature protection: compressor exhaust temperature above the shutdown protection value.…
• P5Cooling anti-freezing protection: indoor pipe (evaporator) temperature below the set value while cooling.…
• P6Cooling overheat protection: outdoor pipe (condenser) temperature beyond its set value while cooling. Clears…
• P7Heating overheat protection: indoor pipe temperature above the set value while heating. Clears when the…
• P8Outdoor temperature too high/low protection: outdoor temperature below 32 degF in cooling, or above 90 degF…
• E0Indoor/outdoor communication fault: no indoor-outdoor communication, or outdoor power abnormal. Restarts…
• E1Room temperature sensor fault: indoor ambient temperature sensor short or open circuit. Restarts…
• E2Indoor coil temperature sensor fault: short or open circuit. Restarts automatically once the sensor is…
• E3Outdoor coil temperature sensor fault: short or open circuit. Restarts automatically once the sensor is…
• E6Indoor fan fault: indoor fan not running or speed abnormal. System recovers automatically; restarts after 3…
• E7Outdoor temperature sensor fault: outdoor ambient temperature sensor short or open circuit. Restarts…
• E8Discharge temperature sensor fault: outdoor exhaust temperature sensor short or open circuit. Restarts…
• E9Inverter drive/module fault: drive or module protection occurs 6 times in 30 min. Clears on power off /…
• EACurrent sensor fault: compressor current below 1 A for 30 s. System recovers automatically; restarts after 3…
• EEOutdoor EEPROM fault: cannot read EEPROM data. Documented clearance: re-flash the EEPROM, power off. (Dometic…
• ELLIN communication fault during self-check. Restarts automatically once LIN communication is restored.…
• EFOutdoor fan fault: outdoor DC fan motor not running or speed abnormal. System recovers automatically…
• ECCAN communication fault during self-check. Restarts automatically once CAN communication is restored.…

Dometic FreshJet FJX (19)

• P0Protection shutdown: over-temperature or over-current detected on the IPM (inverter power) module. (Dometic…
• P1Protection shutdown: supply under-voltage. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• P2Protection shutdown: unit AC over-current. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• P3Protection shutdown: supply over-voltage. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• P4Protection shutdown: compressor discharge tube overheat. (Dometic FreshJet Series 4/7 rooftop AC - models…
• P5Protection shutdown: evaporator coil protection tripped in cooling mode. (Dometic FreshJet Series 4/7 rooftop…
• P6Protection shutdown: condenser coil protection tripped in cooling mode. (Dometic FreshJet Series 4/7 rooftop…
• P7Protection shutdown: evaporator coil protection tripped in heating mode. (Dometic FreshJet Series 4/7 rooftop…
• P9Protection shutdown: compressor drive abnormal, or the compressor does not start. (Dometic FreshJet Series…
• E0Fault: communication failure. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH, FJX7333IHP…
• E1Fault: room (return air) temperature sensor. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• E2Fault: evaporator coil temperature sensor. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• E3Fault: condenser coil temperature sensor. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH…
• E7Fault: outdoor temperature sensor. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH, FJX7333IHP…
• E8Fault: compressor discharge tube temperature sensor. (Dometic FreshJet Series 4/7 rooftop AC - models…
• E9Fault: compressor drive or IPM (inverter power) module. (Dometic FreshJet Series 4/7 rooftop AC - models…
• EAFault: current sensor. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH, FJX7333IHP, FJX7337IHP…
• EEFault: outdoor unit EEPROM. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH, FJX7333IHP…
• ELFault: LIN-BUS / CI-BUS communication failure between the unit and its control network. (Dometic FreshJet…

Furrion Chill Cube (8)

• Solid red LEDInternal control board fault
• E3Loss of communication between the thermostat and control box. System will shut down (both cooling and…
• E6Thermostat indoor temperature sensor out of order. System will shut down.
• loInsufficient low level of +12V power supply. System will shut down.
• E1Control box indoor temperature sensor out of order. System will shut down.
• E2Evaporator temperature sensor out of order. System will shut down.
• E4Condenser temperature sensor out of order. System will shut down.
• E5Outdoor temperature sensor out of order. System will shut down.

Furrion Chill Variable Speed Thermostat (2)

• E6Thermostat indoor temperature sensor out of order. System will shut down. Internal NTC temperature sensor in…
• loInsufficient low level of +12V power supply. System will shut down.

GE RVAC (10)

• -- or FCThermostat signal wire is unplugged or shorted (not communicating with main control)
• F1Indoor coil thermistor — unplugged sensor or temperature less than -22°F (-30°C)
• F2Indoor coil thermistor — shorted wires or temperature greater than 149°F (65°C)
• F3Outdoor coil thermistor — unplugged or temperature less than -22°F (-30°C)
• F4Outdoor coil thermistor — shorted or temperature greater than 149°F (65°C)
• F5Outdoor ambient temp sensor — unplugged or reading below -22°F (-30°C)
• F6Outdoor ambient temp sensor — shorted or reading above 149°F (65°C)
• F7Thermostat room sensor — unplugged or reading below -22°F (-30°C)
• F8Thermostat room sensor — shorted or reading above 149°F (65°C)
• Lo (flashing)Low voltage detection — 12 VDC dropped below 10.5 V. Thermostat switched to OFF mode. 'Lo' flashes while…

Gree (10)

• E6Communication failure between control board and display/thermostat (or indoor and outdoor on split-style).…
• E8High-temperature / overload protection. Often evaporator overheat or indoor motor protection trip.
• F0Refrigerant-shortage / blockage protection. Per the manual, the display shows F0 after the unit enters…
• F1Indoor ambient sensor open or short circuit.
• F2Indoor coil/evaporator sensor open or short circuit.
• F3Outdoor ambient sensor open or short circuit.
• F4Outdoor coil/condenser sensor open or short. On some units, discharge-related.
• H1Defrost cycle active (status — heat pump removing frost from outdoor coil). NOT a fault. Houghton displays…
• H3Compressor overload (thermal cutout tripped).
• PLSupply voltage below the controller's limit. Per the manual: 'If controller detects that system voltage lower…

RecPro RP-AC48V (Houghton AEOLUS) (18)

• E0Motherboard-to-display-board communication fault on the RP-AC48V-H2800/H3400 48 V units (indoor PCB cannot…
• E1Room (return-air) temperature sensor fault - sensor open or shorted.
• E2Indoor coil (evaporator) temperature sensor fault - sensor open or shorted.
• E3Indoor DC fan (evaporator blower) fault - no feedback/tach signal from the indoor blower motor.
• E5Poor performance / insufficient cooling or heating capacity (system efficiency below threshold).
• 0EOutdoor ambient temperature sensor fault - sensor open or shorted.
• 1EOutdoor coil (condenser) temperature sensor fault - sensor open or shorted.
• 2EOutdoor discharge (exhaust) temperature sensor fault - compressor discharge-line sensor open or shorted.
• 4EOutdoor DC fan (condenser fan) fault - no feedback/tach signal from the outdoor fan motor.
• 5EDC bus over-voltage protection - the 48 V supply exceeded the safe input window (45-60 V).
• 6EDC bus under-voltage protection - the 48 V supply dropped below the safe input window (45-60 V).
• 7ECompressor stall protection - the inverter detected the compressor failing to start/turn.
• 8ECompressor locked-rotor protection - the inverter detected a locked/seized compressor rotor.
• 9ECompressor phase-current protection (software) - measured phase current exceeded the firmware limit.
• AECompressor phase-current protection (hardware) - the drive hardware tripped on excessive phase current.
• bECommunication fault between the electric control board and the compressor (inverter) drive board.
• dFDefrost in progress - NORMAL heat-pump operation (not a fault). In heating, the outdoor coil periodically…
• LoLow-voltage warning - the 48 V supply is low (advisory, shown before the 6E under-voltage protection trip).