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MODEL OVERVIEW
About this model: Midea MAT14H2ZWT
Midea MAT14H2ZWT 14,000-BTU wall AC with electric heat: seven exact PDF faults and mode checks.
Match the heater-equipped 14,000-BTU identity
The full MAT14H2ZWT lettering matters here: MAT14H2ZWT is Midea's 230-volt, 14,000-BTU through-wall air conditioner with electric heat. The manufacturer recommends it for heating and cooling up to 700 square feet and prints Cooling with Electric Heat in the exact product specifications. Its capacity line reads 14,000/13,600. The linked owner guide also lists MAT14R2ZWT, a cooling-only sibling, on the cover. Those two share general controls and a code page, but only this H model's product record confirms a heater. The 78.5-pound body is 24.21 inches deep, 20.28 wide and 14.35 high, figures that belong in a sleeve and support check before replacement. The product listing now marks this exact SKU as unavailable, yet its manual is still linked for owners.
Inspect mode and remote before diagnosing no heat
The shared controller steps through Auto, Cool, Dry, Heat and Fan. A warning that cooling-only models have no Heat mode is aimed at the R-suffix variants; the H-suffix model here is explicitly sold with electric heat. Select Heat on the actual unit and set a target above the current room reading before assuming the heater is silent. The general target span in the manual is 62 to 86 degrees Fahrenheit, while Fan Only displays current room temperature rather than a target. HI and LO may indicate that the room reading exceeds the display range. They are not substitutes for the printed HS sensor code. The remote guide also describes a controller version without a Heat key, so an unmatched or replacement remote is poor evidence that a heater does not exist.
Account for programmed changes and remote sensing
After a power interruption this wall unit can restore its recent settings automatically. A heat call after an outage might therefore come from a saved mode, not a spontaneous sensor fault. The timer schedules start or stop in 30-minute steps through ten hours and one-hour steps to 24 hours. Sleep adjusts the target in two early stages and holds its revised target for seven hours; Energy Saver continues the fan for three minutes after the compressor stops and later samples the air intermittently. Neither planned fan behavior nor a timer is by itself E3, which refers to fan stall. C-SENSE uses the remote's location as the temperature reference and exits if its signal is absent seven minutes. A remote behind furniture or in a different room may change comfort even though the wall unit's sensors are healthy.
Decode the seven printed faults precisely
The page-32 table gives AS for a room-temperature sensor, ES for the evaporator sensor, HS for the electric-heating sensor and CS for the condenser sensor. It labels oS as a room-temperature sensor error too; preserve its lower-case-looking first character rather than rewriting it as zero. E3 means the fan has stalled, and E0 means EEPROM parameter failure. Because this model actually has heat, HS is applicable here, unlike the cooling-only MAT14R2ZWT. For any displayed code Midea's owner instruction is to unplug and reconnect and to call service if it returns. The instruction does not authorize removing the wall cabinet or probing a powered heater. Report exact characters, mode, room condition and whether heat, cooling or airflow was missing. A code is stronger evidence than an inferred symptom.
Check maintenance and family-manual limits
The Check Filter light comes on after 250 operating hours; wash or clean the filter as directed and then clear the reminder. It is a maintenance notice rather than an eighth fault code. The family PDF uses a typical panel image and describes features that may vary, so compare the physical controls and installed label before applying a remote-button instruction. For weak cooling without a code, confirm Cool rather than Fan or Dry, note any Energy Saver interval and allow the appliance to respond to a sensible target. For weak heat, confirm Heat, power and the 230-volt installation with an appropriate professional, then note whether HS is actually shown. This larger model shares dimensions with other wall units, but it has its own capacity, mass and heater classification. Those exact specifications should travel with any service request.
Verified model details
Exact 14,000/13,600 heat-cool variant
Source for this detail700-square-foot rating, 78.5-lb weight
Source for this detailHS is applicable; cooling-only sibling differs
Source for this detailSeven faults rendered on owner PDF p32
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 14,000 BTU 230V In-Wall Air Conditioner with Heat MAT14H2ZWT
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.