Safety first: Unplug before removing the bucket/filter and cleaning coils. Do not bend refrigerant tubing or use sharp tools on fins. Move the unit upright, and never repair refrigerant lines yourself.
Confirm exact model and variant
Midea MAD50C1AWS (check full data plate); do not confuse it with a similar MAD50 pump-equipped suffix. The cited document distinguishes pump and no-pump protection codes.
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 · Ice forms during low room temperatures02 · Airflow over evaporator is blocked03 · Ice rapidly reforms in a warm room with filter clear
01
Ice forms during low room temperatures
HOW TO CHECK & CORRECT THIS CAUSE
- Stop cooling, let coil thaw naturally, move to the manual's approved operating temperature range and keep doors/windows closed while the room recovers.
How to tell it is fixed: Frost clears and does not reform rapidly under normal conditions.
02
Airflow over evaporator is blocked
HOW TO CHECK & CORRECT THIS CAUSE
- Unplug, remove the filter, wash/dry it as specified, clear blocked inlet and outlet space, then reinstall before running.
How to tell it is fixed: Uniform intake airflow returns and coil remains frost-free.
03
Ice rapidly reforms in a warm room with filter clear
HOW TO CHECK & CORRECT THIS CAUSE
- Stop continuous operation and investigate evaporator temperature sensor, refrigeration charge and fan by trained service.
- Do not scrape the coil or use a heater to force defrost.
How to tell it is fixed: Coil remains ice-free after component repair at normal room RH.
Model source and method basis
Reference: Read corresponding manufacturer/manual source ↗
The fault definitions, named controls and any published specifications follow the linked documentation. Ordered isolation tests are conservative explanatory procedures, not a claim that all checks are verbatim factory service instructions. If the stated manual does not establish a measurement or part compatibility, this guide deliberately does not invent it.