Carrier Humidifiers & Dehumidifiers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Dehumidifier will not run, display shows E1 and keypad does not respond to button presses.
Control Panel Communication Error
E2
Dehumidifier display shows E2 and unit will not start or shuts down shortly after starting.
Room Temperature Sensor (Thermistor) Fault
E3
Dehumidifier shows E3 and the compressor does not run, or unit cycles off quickly.
Evaporator Coil Temperature Sensor Fault
E4
Dehumidifier displays E4 and shuts down or never starts the compressor.
Defrost / Frost Protection Sensor or Circuit Fault
E5
Dehumidifier shows E5 and the compressor does not start or shuts off quickly after starting.
Refrigerant System or High-Pressure Protection Fault
E6
Dehumidifier displays E6 and will not dehumidify properly; compressor may not start.
Humidity Sensor (RH Sensor) Fault
E7
Dehumidifier shows E7 and will not run or stops shortly after starting.
Water Level / Float Switch Fault
E8
Dehumidifier displays E8 and shuts down; fan may run briefly then stop.
Overheat / High Temperature Protection Fault
E9
Dehumidifier shows E9 and will not start or shuts down unexpectedly.
EEPROM / Control Board Memory Error
EC
Dehumidifier displays EC and does not remove moisture effectively; compressor may not run.
Refrigerant System / Low Refrigerant or Sensor Error
F0
Dehumidifier shows F0 and will not start or runs only briefly.
Low Ambient Temperature / Frost Protection Lockout
F1
Dehumidifier displays F1 and does not respond correctly to humidity settings.
Humidity Sensor Calibration / Fault Error
F2
Dehumidifier shows F2 and the fan may not run or runs erratically.
Fan Motor or Fan Feedback Error
F3
Dehumidifier displays F3 and compressor operation is inhibited.
Compressor Overload / Current Protection Error
H1
Whole-home Carrier humidifier control shows H1 and humidifier does not operate.
Outdoor Temperature Sensor Fault (Humidifier Control)
H2
Carrier furnace/thermostat indicates H2 and bypass or fan-powered humidifier does not run.
Humidifier Water Flow / Solenoid Fault
H3
Carrier thermostat or humidifier control shows H3; humidifier runs continuously or not at all regardless of humidity setting.
Humidistat / Humidity Control Fault
P1
Dehumidifier displays P1 and does not start dehumidifying.
Defrost Mode Active / Coil Protection
P2
Dehumidifier displays P2 and stops running; bucket may be full or connected to a drain hose.
Bucket Full / Drain Protection Mode
Symptom
Dehumidifier bucket overflows or leaks water onto the floor.
Drainage System Blockage or Misalignment
Symptom
Dehumidifier causes excessive vibration and may move or rattle against walls.
Imbalanced Fan or Loose Mounting
Symptom
Dehumidifier coils freeze into a solid block of ice during operation.
Evaporator Coil Icing
Symptom
Dehumidifier display works but buttons do not respond or respond intermittently.
Keypad / User Interface Failure
Symptom
Dehumidifier emits a musty or moldy odor from the air outlet.
Biological Growth on Coils or in Water Bucket
Symptom
Dehumidifier fan runs but very little air comes out of the grille.
Airflow Restriction or Fan Assembly Issue
Symptom
Dehumidifier frequently turns on and off (short cycling) without significantly lowering humidity.
Short Cycling Due to Control or Sizing Issues
Symptom
Dehumidifier is very noisy during operation; rattling, buzzing, or grinding sounds.
Mechanical Vibration or Fan/Compressor Noise
Symptom
Dehumidifier powers on but compressor never starts; only fan runs continuously.
Compressor Start Circuit Failure
Symptom
Dehumidifier runs briefly then shuts off; may restart after several minutes.
Compressor Overheating / Thermal Overload Trip
Symptom
Dehumidifier runs but does not collect water; room remains humid.
Loss of Refrigerant Charge or Severely Reduced Cooling Capacity
Symptom
Dehumidifier will not power on at all; no lights or display.
No Power / Main Power Circuit Failure
Symptom
Whole-home Carrier humidifier corrodes furnace cabinet or nearby metal surfaces.
Excess Moisture / Over-Humidification
Symptom
Whole-home Carrier humidifier does not add moisture even though it appears to run.
Insufficient Humidifier Output
Symptom
Whole-home Carrier humidifier leaks water onto the furnace or floor.
Humidifier Drainage Failure
Symptom
Whole-home Carrier humidifier makes loud banging or water hammer noises when starting or stopping.
Water Hammer in Humidifier Supply Line
Symptom
Whole-home Carrier humidifier produces white dust or mineral deposits around vents.
Mineral Carryover from Humidifier
Symptom
Whole-home Carrier humidifier runs even when there is no call for heat or humidity.
Humidifier Stuck On
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier will not run, display shows E1 and keypad does not respond to button presses.
|
Control Panel Communication Error | View Details |
| E2 |
Dehumidifier display shows E2 and unit will not start or shuts down shortly after starting.
|
Room Temperature Sensor (Thermistor) Fault | View Details |
| E3 |
Dehumidifier shows E3 and the compressor does not run, or unit cycles off quickly.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E4 |
Dehumidifier displays E4 and shuts down or never starts the compressor.
|
Defrost / Frost Protection Sensor or Circuit Fault | View Details |
| E5 |
Dehumidifier shows E5 and the compressor does not start or shuts off quickly after starting.
|
Refrigerant System or High-Pressure Protection Fault | View Details |
| E6 |
Dehumidifier displays E6 and will not dehumidify properly; compressor may not start.
|
Humidity Sensor (RH Sensor) Fault | View Details |
| E7 |
Dehumidifier shows E7 and will not run or stops shortly after starting.
|
Water Level / Float Switch Fault | View Details |
| E8 |
Dehumidifier displays E8 and shuts down; fan may run briefly then stop.
|
Overheat / High Temperature Protection Fault | View Details |
| E9 |
Dehumidifier shows E9 and will not start or shuts down unexpectedly.
|
EEPROM / Control Board Memory Error | View Details |
| EC |
Dehumidifier displays EC and does not remove moisture effectively; compressor may not run.
|
Refrigerant System / Low Refrigerant or Sensor Error | View Details |
| F0 |
Dehumidifier shows F0 and will not start or runs only briefly.
|
Low Ambient Temperature / Frost Protection Lockout | View Details |
| F1 |
Dehumidifier displays F1 and does not respond correctly to humidity settings.
|
Humidity Sensor Calibration / Fault Error | View Details |
| F2 |
Dehumidifier shows F2 and the fan may not run or runs erratically.
|
Fan Motor or Fan Feedback Error | View Details |
| F3 |
Dehumidifier displays F3 and compressor operation is inhibited.
|
Compressor Overload / Current Protection Error | View Details |
| H1 |
Whole-home Carrier humidifier control shows H1 and humidifier does not operate.
|
Outdoor Temperature Sensor Fault (Humidifier Control) | View Details |
| H2 |
Carrier furnace/thermostat indicates H2 and bypass or fan-powered humidifier does not run.
|
Humidifier Water Flow / Solenoid Fault | View Details |
| H3 |
Carrier thermostat or humidifier control shows H3; humidifier runs continuously or not at all regardless of humidity setting.
|
Humidistat / Humidity Control Fault | View Details |
| P1 |
Dehumidifier displays P1 and does not start dehumidifying.
|
Defrost Mode Active / Coil Protection | View Details |
| P2 |
Dehumidifier displays P2 and stops running; bucket may be full or connected to a drain hose.
|
Bucket Full / Drain Protection Mode | View Details |
| – |
Dehumidifier bucket overflows or leaks water onto the floor.
|
Drainage System Blockage or Misalignment | View Details |
| – |
Dehumidifier causes excessive vibration and may move or rattle against walls.
|
Imbalanced Fan or Loose Mounting | View Details |
| – |
Dehumidifier coils freeze into a solid block of ice during operation.
|
Evaporator Coil Icing | View Details |
| – |
Dehumidifier display works but buttons do not respond or respond intermittently.
|
Keypad / User Interface Failure | View Details |
| – |
Dehumidifier emits a musty or moldy odor from the air outlet.
|
Biological Growth on Coils or in Water Bucket | View Details |
| – |
Dehumidifier fan runs but very little air comes out of the grille.
|
Airflow Restriction or Fan Assembly Issue | View Details |
| – |
Dehumidifier frequently turns on and off (short cycling) without significantly lowering humidity.
|
Short Cycling Due to Control or Sizing Issues | View Details |
| – |
Dehumidifier is very noisy during operation; rattling, buzzing, or grinding sounds.
|
Mechanical Vibration or Fan/Compressor Noise | View Details |
| – |
Dehumidifier powers on but compressor never starts; only fan runs continuously.
|
Compressor Start Circuit Failure | View Details |
| – |
Dehumidifier runs briefly then shuts off; may restart after several minutes.
|
Compressor Overheating / Thermal Overload Trip | View Details |
| – |
Dehumidifier runs but does not collect water; room remains humid.
|
Loss of Refrigerant Charge or Severely Reduced Cooling Capacity | View Details |
| – |
Dehumidifier will not power on at all; no lights or display.
|
No Power / Main Power Circuit Failure | View Details |
| – |
Whole-home Carrier humidifier corrodes furnace cabinet or nearby metal surfaces.
|
Excess Moisture / Over-Humidification | View Details |
| – |
Whole-home Carrier humidifier does not add moisture even though it appears to run.
|
Insufficient Humidifier Output | View Details |
| – |
Whole-home Carrier humidifier leaks water onto the furnace or floor.
|
Humidifier Drainage Failure | View Details |
| – |
Whole-home Carrier humidifier makes loud banging or water hammer noises when starting or stopping.
|
Water Hammer in Humidifier Supply Line | View Details |
| – |
Whole-home Carrier humidifier produces white dust or mineral deposits around vents.
|
Mineral Carryover from Humidifier | View Details |
| – |
Whole-home Carrier humidifier runs even when there is no call for heat or humidity.
|
Humidifier Stuck On | View Details |
No matching codes found
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