Aprilaire
Aprilaire 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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CL
Aprilaire dehumidifier control displays CL, and the unit will not dehumidify.
Control Lockout / Child Lock Enabled
E1
Aprilaire digital humidifier control displays E1, and the humidifier will not run.
Outdoor Temperature Sensor Open or Shorted
E1
Aprilaire whole-home dehumidifier (e.g., models 1830, 1850, 1870) displays E1 on the onboard control.
Return Air Temperature Sensor Fault
E2
Aprilaire digital humidifier control shows E2, and the humidifier does not operate automatically.
Indoor Temperature Sensor Fault
E2
Aprilaire whole-home dehumidifier displays E2, and it will not run.
Supply Air Temperature Sensor Fault
E3
Aprilaire dehumidifier displays E3 and shuts down.
Refrigeration System High Temperature / Coil Overheat Fault
E3
Aprilaire digital humidifier control displays E3, and the humidifier will not run in automatic mode.
Relative Humidity Sensor Fault
E4
Aprilaire dehumidifier displays E4, and it will not start the compressor.
Low Temperature / Coil Freeze Protection Fault
E4
Aprilaire digital humidifier control shows E4, and the humidifier does not respond to a call for humidity.
Control Internal Fault / EEPROM Error
E5
Aprilaire dehumidifier displays E5 and stops running.
Float Switch / Condensate Overflow Fault
E5
Aprilaire digital humidifier control displays E5, and the humidifier will not energize the solenoid valve.
Humidifier Output Circuit Fault
E6
Aprilaire dehumidifier displays E6 and will not respond to the wall control.
Communication Error Between Dehumidifier and Remote Wall Control
E6
Aprilaire digital humidifier control displays E6, and the humidifier does not run when the furnace is on.
Furnace Interlock / Airflow Proving Fault
E7
Aprilaire dehumidifier shows E7 and shuts down.
Internal Control Board Fault
E7
Aprilaire digital humidifier control displays E7, and the humidifier runs erratically or not at all.
Water Panel / Service Interval Lockout (Some Models)
F1
Aprilaire dehumidifier displays F1 and will not start the compressor.
High Refrigerant Pressure / High Head Pressure Fault
F2
Aprilaire dehumidifier shows F2 and cycles off quickly.
Low Refrigerant Pressure / Low Suction Pressure Fault
HI
Aprilaire dehumidifier display shows HI and runs continuously.
High Humidity Indication / Sensor at Upper Limit
LO
Aprilaire dehumidifier display shows LO, and the unit does not dehumidify.
Low Ambient Temperature Lockout
Symptom
Aprilaire bypass humidifier does not produce any moisture even though the furnace is running.
No Water Flow to Humidifier
Symptom
Aprilaire dehumidifier coils freeze up during operation.
Evaporator Coil Icing
Symptom
Aprilaire dehumidifier display is blank, but the outlet has power.
Control Power Failure.
Symptom
Aprilaire dehumidifier does not drain properly when connected to a condensate pump.
Improper Condensate Pump Integration
Symptom
Aprilaire dehumidifier fan runs but the compressor never starts.
Compressor Start Circuit Failure.
Symptom
Aprilaire dehumidifier is very loud or vibrating excessively.
Mechanical Vibration / Mounting Issue.
Symptom
Aprilaire dehumidifier runs but does not remove moisture (air feels unchanged, bucket or drain is dry).
Loss of Dehumidification Capacity.
Symptom
Aprilaire dehumidifier short cycles (turns on and off frequently).
Short Cycling Control or Refrigeration Issue.
Symptom
Aprilaire dehumidifier trips the circuit breaker or blows a fuse when starting.
Electrical Overload / Short Circuit.
Symptom
Aprilaire humidifier bypass duct is sweating or dripping water.
Condensation on Bypass Duct
Symptom
Aprilaire humidifier causes condensation on windows and walls.
Over-Humidification / Control Misadjustment.
Symptom
Aprilaire humidifier continues running even when the humidity setpoint is reached.
Humidistat Stuck Closed or Miscalibrated.
Symptom
Aprilaire humidifier does not turn on at all (no click, no water, no fan).
No Power to Humidifier Control Circuit.
Symptom
Aprilaire humidifier fan (on fan-powered models) is noisy, rattling, or squealing.
Humidifier Fan Motor or Wheel Failure
Symptom
Aprilaire humidifier makes a loud banging or water hammer noise when turning on or off.
Water Hammer in Supply Line
Symptom
Aprilaire humidifier runs, but home humidity stays low.
Insufficient Humidification Capacity
Symptom
Aprilaire humidifier water panel scales up very quickly (within weeks).
Excessive Mineral Deposition
Symptom
Musty or moldy odor coming from Aprilaire dehumidifier or humidifier.
Biological Growth in Water or Condensate System.
Symptom
Water leaking from the Aprilaire humidifier onto the furnace or floor.
Humidifier Drainage Failure / Overflow
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CL |
Aprilaire dehumidifier control displays CL, and the unit will not dehumidify.
|
Control Lockout / Child Lock Enabled | View Details |
| E1 |
Aprilaire digital humidifier control displays E1, and the humidifier will not run.
|
Outdoor Temperature Sensor Open or Shorted | View Details |
| E1 |
Aprilaire whole-home dehumidifier (e.g., models 1830, 1850, 1870) displays E1 on the onboard control.
|
Return Air Temperature Sensor Fault | View Details |
| E2 |
Aprilaire digital humidifier control shows E2, and the humidifier does not operate automatically.
|
Indoor Temperature Sensor Fault | View Details |
| E2 |
Aprilaire whole-home dehumidifier displays E2, and it will not run.
|
Supply Air Temperature Sensor Fault | View Details |
| E3 |
Aprilaire dehumidifier displays E3 and shuts down.
|
Refrigeration System High Temperature / Coil Overheat Fault | View Details |
| E3 |
Aprilaire digital humidifier control displays E3, and the humidifier will not run in automatic mode.
|
Relative Humidity Sensor Fault | View Details |
| E4 |
Aprilaire dehumidifier displays E4, and it will not start the compressor.
|
Low Temperature / Coil Freeze Protection Fault | View Details |
| E4 |
Aprilaire digital humidifier control shows E4, and the humidifier does not respond to a call for humidity.
|
Control Internal Fault / EEPROM Error | View Details |
| E5 |
Aprilaire dehumidifier displays E5 and stops running.
|
Float Switch / Condensate Overflow Fault | View Details |
| E5 |
Aprilaire digital humidifier control displays E5, and the humidifier will not energize the solenoid valve.
|
Humidifier Output Circuit Fault | View Details |
| E6 |
Aprilaire dehumidifier displays E6 and will not respond to the wall control.
|
Communication Error Between Dehumidifier and Remote Wall Control | View Details |
| E6 |
Aprilaire digital humidifier control displays E6, and the humidifier does not run when the furnace is on.
|
Furnace Interlock / Airflow Proving Fault | View Details |
| E7 |
Aprilaire dehumidifier shows E7 and shuts down.
|
Internal Control Board Fault | View Details |
| E7 |
Aprilaire digital humidifier control displays E7, and the humidifier runs erratically or not at all.
|
Water Panel / Service Interval Lockout (Some Models) | View Details |
| F1 |
Aprilaire dehumidifier displays F1 and will not start the compressor.
|
High Refrigerant Pressure / High Head Pressure Fault | View Details |
| F2 |
Aprilaire dehumidifier shows F2 and cycles off quickly.
|
Low Refrigerant Pressure / Low Suction Pressure Fault | View Details |
| HI |
Aprilaire dehumidifier display shows HI and runs continuously.
|
High Humidity Indication / Sensor at Upper Limit | View Details |
| LO |
Aprilaire dehumidifier display shows LO, and the unit does not dehumidify.
|
Low Ambient Temperature Lockout | View Details |
| – |
Aprilaire bypass humidifier does not produce any moisture even though the furnace is running.
|
No Water Flow to Humidifier | View Details |
| – |
Aprilaire dehumidifier coils freeze up during operation.
|
Evaporator Coil Icing | View Details |
| – |
Aprilaire dehumidifier display is blank, but the outlet has power.
|
Control Power Failure. | View Details |
| – |
Aprilaire dehumidifier does not drain properly when connected to a condensate pump.
|
Improper Condensate Pump Integration | View Details |
| – |
Aprilaire dehumidifier fan runs but the compressor never starts.
|
Compressor Start Circuit Failure. | View Details |
| – |
Aprilaire dehumidifier is very loud or vibrating excessively.
|
Mechanical Vibration / Mounting Issue. | View Details |
| – |
Aprilaire dehumidifier runs but does not remove moisture (air feels unchanged, bucket or drain is dry).
|
Loss of Dehumidification Capacity. | View Details |
| – |
Aprilaire dehumidifier short cycles (turns on and off frequently).
|
Short Cycling Control or Refrigeration Issue. | View Details |
| – |
Aprilaire dehumidifier trips the circuit breaker or blows a fuse when starting.
|
Electrical Overload / Short Circuit. | View Details |
| – |
Aprilaire humidifier bypass duct is sweating or dripping water.
|
Condensation on Bypass Duct | View Details |
| – |
Aprilaire humidifier causes condensation on windows and walls.
|
Over-Humidification / Control Misadjustment. | View Details |
| – |
Aprilaire humidifier continues running even when the humidity setpoint is reached.
|
Humidistat Stuck Closed or Miscalibrated. | View Details |
| – |
Aprilaire humidifier does not turn on at all (no click, no water, no fan).
|
No Power to Humidifier Control Circuit. | View Details |
| – |
Aprilaire humidifier fan (on fan-powered models) is noisy, rattling, or squealing.
|
Humidifier Fan Motor or Wheel Failure | View Details |
| – |
Aprilaire humidifier makes a loud banging or water hammer noise when turning on or off.
|
Water Hammer in Supply Line | View Details |
| – |
Aprilaire humidifier runs, but home humidity stays low.
|
Insufficient Humidification Capacity | View Details |
| – |
Aprilaire humidifier water panel scales up very quickly (within weeks).
|
Excessive Mineral Deposition | View Details |
| – |
Musty or moldy odor coming from Aprilaire dehumidifier or humidifier.
|
Biological Growth in Water or Condensate System. | View Details |
| – |
Water leaking from the Aprilaire humidifier onto the furnace or floor.
|
Humidifier Drainage Failure / Overflow | View Details |
No matching codes found
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