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warning Aprilaire
Error Code Yellow Steam Light
Indicates humidifier is operating below expected capacity, often due to low water conductivity or installation in soft water.
? What Causes This
Use of softened water or systems with short operation cycles leading to slower mineral conductivity build-up affecting steam production.
✓ How to Fix It
Consider changing the water canister type; use blower activation features; install on higher conductivity supply if needed;
Source: page 27 of the official manual
From the manual
This error code appears in:
Aprilaire 800