Error code reference

Aprilaire HVAC Error Code E8

Inlet Air Temperature Out of Range: The incoming air temperature is less than 50°F or higher than 104°F, or the dew point is below 40°F when the compressor is attempting to start. This code is self-correcting.

SourceAprilaire Dehumidifier - Service Manual: Models 1830, 1850, 1870p. 8

Aprilaire codes Aprilaire hvac codes

Diagnostic procedure

The full E8 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Turn the ON/OFF toggle switch OFF to reset the diagnostic code, then inspect ductwork for leaks and verify the dehumidifier is not ducted to the supply side of the HVAC system.

SourceAprilaire Dehumidifier - Service Manual: Models 1830, 1850, 1870p. 8

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

2 manuals in the MyPros+ library document this code for Aprilaire hvac.

Models covered by the manuals that document this code

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The full E8 procedure

Where this code is documented

Models covered by the manuals that document this code

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