Safety first: Unplug before pulling the bucket, washing a filter or inspecting drain hardware. Keep water off electrical outlets. Refrigerant-sealed refrigeration work and internal mains/PCB repairs require authorized service.
Model and version covered
Midea MAD50C1AWS 50-pint EasyDry, the no-built-in-pump version. Do not apply drain-pump hose, Eb or pump-flashing procedures intended for MAD50P1AWS.
Version check: MAD50C1AWS is the non-pump variant. Do not use the drain-pump repair instructions for pump-equipped models.
DIAGNOSE THE CAUSE · APPLY THE FIX · CONFIRM THE RESULT
Find the cause and fix it
Jump to your symptom: 01 · AS appears and air humidity control stops02 · AS returns on a clear, dry, correctly powered unit
01
AS appears and air humidity control stops
HOW TO CHECK & CORRECT THIS CAUSE
- AS identifies a humidity sensor fault in the MAD50C1AWS manual.
- Unplug once and reconnect after a safe pause, then operate at a humidity target below room humidity to check if sensor reporting returns.
How to tell it is fixed: AS disappears and humidity control operates normally.
02
AS returns on a clear, dry, correctly powered unit
HOW TO CHECK & CORRECT THIS CAUSE
- A faulty humidity-sensing harness/module is not repaired by changing the water bucket.
- Obtain the exact matched sensor/control service diagnosis instead of guessing thermistor resistance.
How to tell it is fixed: Replacement of the confirmed faulty unit restores plausible RH reading with no AS.
Source and model restrictions
Technical baseline: Manufacturer guide or model manual ↗