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critical Aprilaire
Error Code Red Service Light
Indicates that service is urgently required due to high electrical demand and can only be resolved by cleaning/rinsing unit/canister.
? What Causes This
Humidifier detects excessive current draw despite multiple drainage attempts, indicative of severe mineral blockage in electrodes or water pathway system.
✓ How to Fix It
Shut down humidifier, clean the interior components including removal/replacement of steam canister; consult service if not resolved manually;
Source: page 27 of the official manual
From the manual
This error code appears in:
Aprilaire 800