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Model reference

Aprilaire 1850

HVAC

2 documents9 error codes3 service modes

Available documentation

Service Manual

  • Aprilaire Dehumidifier Troubleshooting Manual18 pg
    Covers this model
  • Aprilaire Dehumidifier Troubleshooting Manual23 pg
    Covers this model
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Error codes (9)

CodeMeaning
E1Internal RH/Temperature Sensor open or shortedE2High Refrigeration PressureE3Model 76 Remote Control Communication LossE4Insufficient CapacityE5High Temperature Sensor Thermistor FailureE6Low Temperature Sensor (Frost Sensor) Thermistor FailureE7Float Switch OpenE8Inlet Air Temperature or Dew Point Out of RangeE9Outdoor Temperature Sensor open or shorted

Service modes (3)

  • Diagnostic Data Display["With the dehumidifier running, press and hold the MODE and UP buttons for 3 seconds then…
  • Diagnostic Data Display (Inlet/Suction Readings)["While the unit is running (fan or compressor on), press and hold the MODE and UP buttons for 3…
  • Installer Test Mode["Use the ON/OFF button on the User Interface Assembly to turn the mode to OFF.","Flip the ON/OFF…

Full entry steps, exit procedures, and test sequences are available in Max.

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