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MODEL OVERVIEW
About this model: Midea MAW18R2BWT
Midea MAW18R2BWT 18,000-BTU window AC: large-unit installation and two unqualified owner-PDF codes.
Identify the large, cooling-only cabinet
MAW18R2BWT is Midea's 18,000-BTU DOE window conditioner recommended for spaces up to 1,000 square feet. Its own product specifications say Cool, Dehumidify and Ventilate, with no heat and no smart control. They give a 117.07-pound weight and a body 23.62 inches deep, 25.39 wide and 17.91 high. The exact linked owner PDF names this SKU and MAW25R2BWT on the cover, then lists 18,000/17,700 BTU per hour, no heating capacity and a 230/208-volt supply for this row. Do not substitute the 25,000-BTU sibling's figures or an illustrated remote feature when assessing an existing installation. The product page now says unavailable, but the owner manual remains accessible. The model plate and electrical rating should be confirmed by a qualified installer before removal or replacement.
Check the structure before discussing performance
The manual's 15,000-to-28,500-BTU installation section applies to a unit of this size and recommends two people. The window wood and frame must be sound enough to hold its fasteners. A supported cabinet, side filler panels, sill brackets and outward three-to-four-degree slope are part of the cooling system: they keep the heavy appliance stable and direct condensate away. The chassis slides into the mounted cabinet; the guide warns against pressing the controls or finned coils during that lift. Because the body weighs over 117 pounds, an improvised one-person removal creates a real injury and property risk. If water reaches the inside sill, first check the outward pitch and drainage slots. If air feels weak, check that curtains, furniture or exterior shrubs do not block airflow before blaming the refrigerant circuit.
Separate normal controls from faults
The exact product page advertises a programmable timer and reusable washable filter, but the family manual shows several possible control faces. It explicitly warns that buttons, Heat and wireless features can differ; this SKU's page says no heat and no smart control. In Dry mode the fan is automatically low, and Fan Only does not maintain a temperature setpoint. A compressor that pauses after a rapid change can be following the manual's three-minute protection rather than failing. The Check Filter lamp comes after 250 hours and should be cleared after cleaning, not treated as a sensor code. The timer can advance in half-hours to ten hours, then whole hours to twenty-four, so a scheduled stop may also be intentional. HI or LO in Fan mode can describe room temperature beyond the display range.
Use only the two unqualified diagnostic strings
The rendered PDF page 34 lists AS for the room-temperature sensor and ES for the evaporator-temperature sensor without model qualifiers. It also prints HS for an electric heater, plus CS, OS and E7, each marked 'on some models'. HS cannot be transferred to this explicitly cooling-only product, and the exact listing does not establish the other optional diagnostics. Consequently this model index presents AS and ES as the verified code pair and leaves the optional rows out. If either string actually appears, write it down, unplug and reconnect once, then seek service if it repeats. Midea's reset instruction is not a reason to expose electrical parts or remove the chassis. Report the full MAW18R2BWT suffix, display and selected mode so service does not confuse this machine with MAW25R2BWT.
Diagnose weak cooling with model-specific checks
A large room can still overtax the 1,000-square-foot recommendation if it opens into other spaces, receives substantial sun or admits hot outdoor air around the sash. First confirm Cool is selected, the target is below room temperature, the filter is clean and the unit has had its three-minute compressor delay. Check both inside and outside airflow and the window seal. An interval from the programmable timer or a Fan Only selection can make the system appear idle while no code is displayed. Do not mistake the owner's manual diagrams of heat or wireless panels for this model's equipment. If AS or ES recurs after the prescribed single restart, or cooling remains poor after airflow and installation checks, arrange qualified service with the exact electrical and capacity details from the model plate. The manufacturer PDF is the source for full installation steps.
Verified model details
Exact 18,000-BTU cooling-only SKU on manual cover
Source for this detail117.07-lb, 230/208-V large-window unit
Source for this detailAS and ES have no optional qualifier
Source for this detailHeater/smart and optional codes excluded
Source for this detail
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Midea 18,000 BTU DOE Window Air Conditioner MAW18R2BWT
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.