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MODEL OVERVIEW
About this model: Midea MRB19B7AST
The MRB19B7AST bottom-freezer manual maps five paired panel indicators to sensor and communication faults.
Confirm the bottom-freezer identity
Midea Canada lists MRB19B7AST as the stainless, 18.7-cubic-foot bottom-mount refrigerator, 29.5 inches wide. Its fresh-food section is 13.07 cubic feet and its lower freezer 5.62; two humidity-controlled crispers and adjustable glass shelves give it a layout unlike the French-door MRF18B4AST. The freezer is ice-maker ready, which is not a claim that an accessory is installed. The official PDF cover names MRB19B7AST next to white MRB19B7AWW and shows the older version-A family manual. The exact Canadian product embeds the documentation API that links this file. Compare the full model label and the panel before using the chart. The manual warns that photos may not depict every covered variant; its five fault rows, however, are printed for the named family. This model has a normal pair of lit settings at startup, so a photograph helps distinguish steady lights from flashing faults.
Give the sealed system time after transport
The installation warning is more specific than a generic two-hour rule. If the refrigerator has been horizontal for any period, it says wait 24 hours upright before plugging it in; while moving, do not tilt it beyond 45 degrees. For ordinary upright handling, the Before Use page asks it to stand roughly two hours before connection. Remove shipping foam around the condenser and cabinet, but do not puncture refrigerant tubing. Use a grounded three-prong outlet without adapter or extension. Once connected, the guide suggests a half-hour initial check that it operates; its troubleshooting page allows four hours for full cooling before food is added after disconnection. A cabinet recently moved, warm-loaded or opened repeatedly may need time before its temperature tells a useful story. These delays do not explain a repeated flashing sensor pair, but prevent calling normal stabilization a fault.
Read the six-light control as a whole
On first power, the display lights fully for three seconds. With no failure, LED2 and LED5 illuminate as the medium default, and later the panel shows the current temperature setting. The fridge scale uses LEDs 6, 5 and 4 from cool toward coolest; the freezer uses 3, 2 and 1 from cold toward coldest. Each temperature-key press advances a level and the new setting takes effect after about 25 seconds. A steady LED2 with LED5 is therefore normal, not an error row. Holding the control for three seconds enters standby, stopping the compressor while its indicator remains on; a brief press resumes. Check standby and household power if the appliance seems silent. Photograph the complete six-position panel and whether each lamp is steady or flashing before changing a setting. The failure table concerns paired indicator positions, not an alphanumeric E-code.
Assign the five actual fault pairs
The rendered physical PDF page 21 associates LED1 with LED2 with a refrigerator temperature sensor fault. LED1 plus LED5 concerns the freezer temperature sensor; LED1 plus LED3, the freezer defrost sensor. LED2 with LED4 denotes communication fault, distinct from those measurements. The final printed code cell reads “LED 1 indicator and LED 4 Ambient,” a typesetting oddity; the description column clearly gives ambient temperature sensor fault. Record it as the LED1/LED4 pair, without inventing a missing word in the code cell. LED1 appears in four fault rows and alone cannot identify a cause. On the normal panel LED2 and LED5 can also be lit together, so confirm the fault sequence is flashing as the controls section says. A code table identifies a service topic, not a do-it-yourself sensor replacement.
Check accessible causes while protecting food
The manual's troubleshooting table asks whether a powerless unit is plugged in or a household breaker has tripped. For a door that will not close, rearrange packages, clean the gasket and level the cabinet. A hotter room, a recent large load or frequent opening can make the compressor cycle more without an electronics fault. Do not line shelves with foil or paper, which blocks air circulation; wrap food and dry containers to reduce frost. If fresh food is warm, the guide allows four hours of cooling after disconnection before reloading. Cleaning requires unplugging and a nonflammable mild solution; keep the gasket pliable. If a specific LED pair repeatedly flashes after these checks, move perishables as needed and give qualified service MRB19B7AST, the pair, compartment temperatures, recent movement and a photograph. Leave refrigerant tubing and controls closed.
Verified model details
Exact 18.7-cu.-ft. bottom-mount model
Source for this detailNormal LED2/LED5 startup versus faults
Source for this detailFive verified indicator pairs on PDF page 21
Source for this detailTransport, food and service checks
Source for this detail
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18.7 Cu. Ft. 30" Bottom Mount Freezer Steel | Midea CA
Open official sourceIf there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.