⚠
warning Aprilaire
Error Code 3 blinks
Overheating warning, likely due to blocked ventilation or fan failure.
? What Causes This
Blockage around humidifier vents preventing adequate cooling of equipment core components.
✓ How to Fix It
Turn system off to allow it cool; remove any obstructive debris from around vents. Proceed with caution if error persists by contacting service team.
Source: page 27 of the official manual
From the manual
This error code appears in:
Aprilaire 800