MODEL PROFILE
Signal or code
Error codes and display signals
The official manual linked for this model documents these messages. Some indicators apply only to variants that display them; each entry is labeled as a code, indicator, or status.
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Model and error-code facts may be shown in the language of the original source.
Official PDF manual
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MODEL OVERVIEW
About this model: Midea MAT08H1ZWT
The MAT08H1ZWT manual identifies seven display faults and separates ordinary filter and timer indications.
Identify the exact heating and cooling unit
Midea lists MAT08H1ZWT as an 8,000 BTU, 115 V in-wall air conditioner with electric heat for rooms up to 350 square feet. The exact product page also mentions a remote control and automatic restart using recent settings after power returns. Its published body measurements are 20.28 inches wide, 24.21 inches deep, and 14.35 inches high; the listed product weight is 66.6 pounds. Those are useful for confirming the unit, but measure the actual wall sleeve and available clearance before any installation. The owner PDF names MAT08H1ZWT among several related models on its cover. Match the entire rating-label number before using the diagnostic table, because a similar-looking cooling-only family member can have a different set of applicable functions.
Inspect installation and electrical safety
The manual treats sleeve fit, grounding and grille arrangement as installation work, not an error-code reset. It says the wall sleeve must be structurally sound and firmly secured; a rear grille or flange must also restrain the unit. The installer is directed to connect the grounding wire and maintain the required rearward slope. The R32 refrigerant warning instructs readers not to pierce or burn the appliance and reserves refrigerant work for trained personnel. Owners can check that the visible grille is unobstructed and that the unit sits securely without taking apart the electrical or sealed cooling system. If the sleeve, cord, ground or refrigerant circuit looks damaged, stop using the air conditioner and arrange qualified help before trying to interpret a display fault.
Read controls before calling a status a fault
MAT08H1ZWT has heating as well as cooling, but its shared manual cautions that illustrated panels may include functions absent from some family models. The air-direction louvers can direct flow up or horizontally and left or right. A Check Filter lamp is a maintenance reminder after 250 operating hours; clean the filter and press its button to clear the reminder. The Sleep feature changes the selected temperature in two half-hour stages and later returns to the original setting. The timer uses half-hour increments through ten hours, then one-hour increments to twenty-four hours. On fan-only operation the display can show room temperature, while HI or LO describes an out-of-range reading. These statuses should not be confused with the seven fault strings on the next page.
Interpret the seven codes shown in the PDF
The rendered display section identifies AS as a room-temperature sensor error and ES as an evaporator-temperature sensor error. HS concerns the electric-heating sensor, while CS names the outdoor condenser sensor. The same table also calls oS a room-temperature sensor error, so do not invent a more specific distinction between AS and oS than the manual provides. E3 is a fan-stall error, and E0 indicates a failure of an EEPROM parameter. Case matters: the printed oS begins with a lowercase letter o, and E0 ends with a zero. Photograph the characters before a restart, since they may disappear when power is removed. This manual is the evidence for these labels; it does not authorize replacing sensors or opening the controller as an owner procedure.
Use a limited reset and recognize normal delay
For each listed code, Midea directs the user to unplug the unit and plug it back in, then call for service if the error repeats. Follow that narrow sequence only when the plug is safely accessible and the appliance shows no physical damage. A compressor that waits roughly three minutes after a quick off-and-on cycle is following the documented protective delay, not necessarily reporting E3. The manual also describes ordinary rushing-air, refrigerant gurgling and water-drop sounds; an insecure sleeve can create vibration. These observations help describe the problem accurately, but they do not override a persistent code. Record MAT08H1ZWT, the displayed characters, what mode was running, and whether the message returned after the recommended reset when contacting service.
Verified model details
Exact 8,000 BTU electric-heat wall unit
Source for this detailSleeve and grounding checks before operation
Source for this detailSeven sourced display faults
Source for this detailSafe restart and service boundary
Source for this detail
This description summarizes the linked source documents; check each cited source for your exact model and region.
Manufacturer source
Open official source
Midea 8,000 BTU 115V In-Wall Air Conditioner with Heat MAT08H1ZWT
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.