Error code reference

Aprilaire HVAC Error Code E3

Model 76 Remote Control Communication Loss: A Model 76 control wired to the Remote terminals had communication but has now stopped communicating.

SourceAprilaire Dehumidifier - Service Manual: Models 1830, 1850, 1870p. 3

Aprilaire codes Aprilaire hvac codes

Diagnostic procedure

The full E3 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

Use the color of the wire connected to the A, B, + and-terminals on both the Model 76 base and the dehumidifier User Interface Assembly to verify correct wiring and tight terminal screws.

SourceAprilaire Dehumidifier - Service Manual: Models 1830, 1850, 1870p. 3

Unlock with pass

More steps, wiring diagram references, and verified part numbers

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

Unlock E3 procedure $9.95

Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.

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

75,000+ service documents · 20,000+ error codes · 100+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax

The full E3 procedure

Where this code is documented

Models covered by the manuals that document this code

Related Aprilaire hvac error codes