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MODEL OVERVIEW
About this model: Midea MRT12B2AST
MRT12B2AST is Midea's 11.5-cu-ft Canadian top-freezer refrigerator with a separate freezer dial and three documented two-LED fault patterns.
Identify this narrow top-freezer model
MRT12B2AST is Midea Canada's 24-inch-wide, top-mounted-freezer refrigerator with 11.5 cubic feet total capacity. The exact product specifications divide that into 8.4 cubic feet of fresh-food storage and 3.1 of freezer space. Its listed cabinet measures 24 inches wide, 28.9 deep and 59.8 high. Midea describes adjustable and spill-proof glass shelves, a produce crisper, gallon-sized door bins and automatic defrost. The linked owner PDF names MRT12B2AST beside the white MRT12B2AWW on the cover, so the instructions clearly cover this stainless-finish variant. The component diagram also separates the freezer temperature dial from the fresh-food display panel. That division matters: this is not a single thermostat governing both spaces, and the displayed LED combinations must be read using this model's actual manual rather than a refrigerator code list for a different control layout.
Install and level before loading food
The owner guide calls for a freestanding position on a flat, sturdy floor in a ventilated indoor location. It specifies more than 100 mm clearance from each neighboring wall and a 115 V, 60 Hz grounded supply. Leave the cabinet standing half an hour before first connection; after plugging it in, the guide says to operate it for two to three hours before putting food inside, longer in hot summer conditions. Level the feet so the front is slightly higher than the rear, which helps the two doors close. Keep the ventilation openings at the base, sides and rear unobstructed. These simple steps affect temperature stability and energy use. If food is warm or the door gasket cannot seal because the cabinet rocks, the refrigerator may run longer without any sensor fault. Confirm the doors close before changing control settings or interpreting a fault pattern.
Understand two different temperature controls
The refrigerator compartment has a five-step LED coldness control. On initial power-up the guide says it starts at setting 3. Its setting button moves from LED1 marked Cold toward LED5 marked Colder; once chosen, the setting takes effect after a short delay. The freezer has its own mechanical temperature dial. Turning that dial toward MAX cools the freezer further, but the manual warns that less cooling capacity then reaches the refrigerator compartment. If the fresh section feels warm while the freezer seems very cold, consider this trade-off before guessing that a sensor has failed. A normal display shows the selected temperature level, whereas a failure causes a combination of LEDs in a cycling display. The single illuminated level on the fresh-food panel is therefore not the same observation as two fault lamps together.
Protect airflow and handle interruptions
Make room for cold air to circulate. The manual tells owners to cool warm food before loading it and to keep containers away from the rear refrigerator wall, where they might freeze. It describes automatic defrosting, but this does not replace gasket checks or clear ventilation. During a power interruption, open the doors less often and do not add new food; the guide says stored food may last several hours, but its condition still needs judgment after power returns. Keep the produce crisper and shelves arranged so packages do not force a door ajar. A light change in compressor run time during hot weather can be tied to placement and loading. These are usage and installation factors to inspect before calling a normal change in cooling an electronics failure. The LED fault table should be reserved for the documented paired-light indications.
Read paired LED faults accurately
On the rendered owner-PDF page 14, three faults share LED1 but differ by the second lit indicator. LED1 with LED2 identifies the refrigerator temperature-sensor circuit. LED1 with LED3 identifies the freezer defrost sensor. LED1 with LED4 identifies the ambient-temperature sensor. The manual says cooling or freezing can continue even while these warnings are shown, yet instructs the owner to contact a maintenance specialist. Record both lights and whether the display cycles through them; writing down only 'LED1' loses the diagnosis. Also note MRT12B2AST, current fresh-food setting, freezer-dial position and whether the cabinet is still cooling. Avoid equating LED1 as an ordinary Cold setpoint with LED1 plus a second fault light. Those distinctions make the report to a technician useful and prevent parts being chosen from an unrelated numeric-code table.
Verified model details
11.5 cu ft total: 8.4 fresh, 3.1 frozen
Source for this detail24-inch-wide top-freezer cabinet
Source for this detailSeparate five-level fresh-food panel and freezer dial
Source for this detailLED1+LED2, LED1+LED3 and LED1+LED4 confirmed on PDF page 14
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Manufacturer source
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11.5 Cu. Ft. 24" Top Mount Freezer Refrigerator MRT12B2AST
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.