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MODEL OVERVIEW
About this model: Midea MRU21B6ASL
For MRU21B6ASL, three two-LED flashes identify separate sensor faults in a convertible 21-cu.-ft. cabinet.
Confirm the large convertible cabinet
Midea Canada identifies MRU21B6ASL as a 21-cubic-foot stainless upright freezer that can instead operate as a refrigerator. This is one convertible compartment, not simultaneous fresh and frozen zones. Its product dimensions are about 29.72 inches wide, 32.68 deep and 66.61 high; four glass shelves and four door shelves make its storage layout different from the smaller MRU14 series. The product calls its three-sensor system Smart+ Cooling and lists a reversible door. The owner PDF cover explicitly pairs MRU21B6ASL with white MRU21F6AWW, and the exact steel product embeds the documentation API that links that file. Match the entire cabinet label before interpreting its lights, since the manual warns the illustrated panel can vary. The product's garage-ready ambient limits also differ by fridge or freezer mode; an outdoor location is not implied.
Choose one operating mode deliberately
The shared guide says the full panel illuminates for three seconds on first power and then begins at COLDER / FRZ. Each tap of Setting steps through Cold, Colder and Coldest; a changed target takes effect after about 15 seconds. With the control unlocked, a three-second hold turns the freezer icon off and converts the whole chamber to refrigerator operation. Another three-second hold lights the freezer icon and returns it to freezing. Before moving vulnerable food, check which mode is actually selected and allow the cabinet to reach a measured temperature. A steady light that simply marks Cold or FRZ is an operating state. The guide describes a failure differently: the corresponding lamps blink, while the normal display shows the temperature setting. Record the mode and a full flash cycle rather than relying on one still photograph.
Place and power the cabinet safely
Although the listing promotes garage use in tested ambient conditions, the installation instructions call for a sturdy, ventilated indoor position and a freestanding cabinet, not a recessed build-in. Keep air paths open and match a grounded 115-volt, 60-hertz individual receptacle to the rating plate. Level the feet so the front is a little higher than the rear, helping the tall door close. The door can be reversed, but this manual specifically asks users to contact Midea's after-sales team for that work; its hinge and wiring instructions are not a casual troubleshooting step. For first use, allow two to three hours of operation before loading food, with more time in summer. When moving, remove contents and secure shelves, keep the cabinet upright and limit tilt to 45 degrees. These setup checks help separate a warm cabinet from an electronics warning.
Read the three real indicator codes
On rendered physical page 13, LED3 and LED4 flashing together indicate a refrigerator temperature sensor fault. LED2 with LED4 flashing is described in the source as “Freezing frost sensor faults”; preserve that odd plural wording rather than calling it a specific replacement part. LED1 with LED4 flashing indicates an ambient temperature sensor fault. All three include LED4, so LED4 alone cannot identify which row applies. Nor are these E1, E2 and E3 strings: the manual prints positions and flashing behavior. Watch whether the two lamps blink together, document the whole panel and note whether the single chamber is currently in fridge or freezer mode. A code points service toward a sensor circuit, not to an owner-permitted repair or proof that food is safe. Protect the contents first when cooling is uncertain.
Rule out visible causes and preserve contents
When the cabinet does not run, the troubleshooting chapter starts with plug contact, supply voltage, an outage or a tripped circuit. If the door is blocked, remove packages and check the level. A hot room, large new food load and frequent opening can make the compressor run longer without creating one of the paired flashes. In refrigerator mode, avoid warm food, uncovered liquids and containers against the rear wall; in either mode, the guide describes automatic defrost and mild noncorrosive cleaning. During a power failure, open the door less often and add no fresh food. The outer housing can feel warm as the condenser releases heat, and high humidity can leave normal surface condensation. If a verified pair keeps flashing, move food to safe storage and give qualified service MRU21B6ASL, both lamp numbers, mode and observed temperature. Leave sensor and LED replacement to trained personnel.
Verified model details
Exact steel Canadian upright model
Source for this detailMode conversion changes the entire chamber
Source for this detailThree verified flashes on PDF page 13
Source for this detailSafe checks and food protection
Source for this detail
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21 Cu. Ft. Convertible Upright Freezer Steel | Midea CA
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.