AUX E5 Error Code: Tech Tips You Need to Know!

Published: 10 February 2026
on channel: AUX AIR USA

3,269

Seeing an E5 error code on an AUX system? That usually means the indoor and outdoor units aren’t communicating properly. And most of the time, the issue comes down to the signal line.

Josh Locker walks through the step-by-step troubleshooting process—what to check, where problems typically show up, and how to get communication back on track without guesswork.

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