Error code reference

Aprilaire HVAC Error Code E1

Internal RH/Temperature Sensor open or shorted: the User Interface Assembly is not receiving a good signal from the temperature/RH sensor.

SourceAprilaire Dehumidifier - Service Manual: Models 1830 & 1850p. 2

Aprilaire codes Aprilaire hvac codes

Diagnostic procedure

The full E1 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 off power, remove User Interface Assembly, check connection between sensor board and control board; if connection is okay, replace the RH Sensor board (5460).

SourceAprilaire Dehumidifier - Service Manual: Models 1830 & 1850p. 2

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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

3 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 E1 procedure

Where this code is documented

Models covered by the manuals that document this code

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