LiftMaster lists the 81602 as a DC battery-backup chain-drive Wi-Fi opener with integrated Bluetooth, myQ smartphone control and myQ Diagnostics. The official product page lists 893LM, 882LMW and 878MAX as compatible accessories.
Confirm this is the opener you have
Use several source-backed clues together. The motor-unit label remains the strongest identity clue.
Use the full motor-unit label for model identity; do not identify from opener case shape alone.
Use this as a cross-check, not as a substitute for the model label.
This changes power-outage diagnosis and helps separate nearby models.
Keep network/connectivity diagnosis separate from physical door movement.
Model specifications that matter for troubleshooting
Remote / accessory evidence tied to this model
These rows come from the verified compatibility dataset. An added external receiver can still change the active radio path.
Exact-model compatible-accessory baseline: 893LM remote, 882LMW wall control and 878MAX keyless entry are listed by LiftMaster
Use the exact 81602 model first. If an external receiver is installed, preserve that receiver separately before choosing the remote.
Wall-control compatibility for this model
Wired controls follow the opener logic/control interface. Wireless wall consoles follow the active radio receiver.
Wi-Fi Multi-Function Control Panel
Wired logic path. The verified 81602 model record lists 882LMW as the wall control. Keep wall-control compatibility separate from handheld-radio compatibility.
The exact model gives a stronger accessory starting point than appearance
LiftMaster's 81602 product page names 893LM, 882LMW and 878MAX in the compatible-accessory section. Preserve that exact-model evidence before using a generic Learn-button chart.
If an external receiver has been added, record its model separately because the active receiver can change the remote path without changing the opener shell.
Battery, network and door-motion faults are separate branches
The 81602 includes battery backup and myQ connectivity, but neither feature proves the physical door system is healthy. A battery state, Wi-Fi problem and travel/sensor diagnostic should be recorded independently.
Use the exact myQ/UP-DOWN diagnostic code when available rather than repeatedly resetting the opener.
Common troubleshooting paths for this model
Route from the observed symptom or code. Do not use model identity by itself as proof of the failed part.
Remote or keypad replacement
Start from the exact 81602 model and listed accessory family, then verify the live compatibility row before purchase.
Open the exact troubleshooting path →Door will not close
Read the safety-sensor LEDs and any diagnostic code before changing travel or force.
Open the exact troubleshooting path →Power outage / beeping
Because this model has battery backup, distinguish loss of AC power from a battery condition first.
Open the exact troubleshooting path →Problems owners report with the 81602
Model-aware starting points. The first step is a safe check, not a repair; follow the linked guide for the full decision tree.
The opener beeps and the light flashes after a power cut
Usually: the battery backup is running the opener, or the backup battery is low or near end of life
First step: confirm the wall outlet actually has power (check the breaker and any GFCI), then note whether the beeping stops once AC power returns — a beep that continues on mains power points to the battery.
Open the full guide →The door will not close and the opener light flashes
Usually: the safety-sensor circuit is not satisfied — obstruction, misalignment or a wiring fault
First step: read both sensor LEDs: a steady amber sender and a steady green receiver is normal. Clear the beam path near the floor and re-aim the green eye until it is steady.
Open the full guide →A remote stopped working but the wall control still runs the door
Usually: a weak remote battery, lost remote programming, or a full receiver memory
First step: fit a fresh remote battery and retest from a normal distance before reprogramming anything.
Open the full guide →myQ shows the 81602 offline
Usually: the 2.4 GHz Wi-Fi network changed (new router, name or password) or the signal is weak at the ceiling
First step: confirm another 2.4 GHz device works in the garage, then re-add the opener in the myQ app rather than resetting the opener.
Open the full guide →The door reverses right after it touches the floor
Usually: the down-travel limit is set too far, or the door meets resistance near closed
First step: check the door is not binding in the last foot of travel, then adjust the down limit with the model procedure and run the safety-reversal test.
Open the full guide →Nearby LiftMaster models to rule out
Only verified fields are compared. Missing evidence is never converted into a “No.”
2420L
- Smart: Built-in Wi-Fi + myQ vs myQ + myQ Diagnostics
4690L
- Drive / mount: DC chain drive vs DC chain
- Smart: Built-in Wi-Fi + myQ vs myQ family
81650
- Drive / mount: DC chain drive vs Chain drive
- Battery: Yes vs No
- Smart: Built-in Wi-Fi + myQ vs Yes / myQ
Capture these facts before you order or escalate
A clean handoff preserves the evidence that separates opener identity, receiver compatibility and the actual failure symptom.
Motor-unit label
Photograph the full label showing 81602 and any SKU suffix. Use that label for manuals and model-specific parts.
Active receiver / Learn control
Record the Learn-button color or external receiver model separately. A replaced receiver can change remote compatibility without changing the opener model.
Exact symptom or signal
Write down the code, blink count, sensor LED pair, direction of travel and where the door stops or reverses before changing settings.
Door-system boundary
If the door is crooked, off-track, unusually heavy, or has damaged spring/cable hardware, stop opener troubleshooting and hand off the mechanical door problem.
Model-specific guardrails
- DC chain-drive parts should be selected from the 81602 parts diagram, not from a similar belt-drive model.
- Use exact-model plus active-receiver evidence for accessories.
- Stop opener troubleshooting if the door is heavy, off-track or has damaged springs/cables.
Never use opener force or a safety-system bypass to compensate for a heavy, damaged, off-track or unbalanced garage door.
LiftMaster 81602 common questions
Does LiftMaster 81602 have battery backup?
Yes. LiftMaster lists battery backup as a standard feature.
Does 81602 support myQ Diagnostics?
Yes. The product page lists myQ Diagnostics and real-time health/error-code reporting.
Which remote is listed as compatible?
LiftMaster lists the 893LM 3-button remote among compatible accessories.
Verified model sources used
These manufacturer, manual and official parts/support sources are the factual baseline for the model identification and specifications above. Current manufacturer documentation supersedes older copies found elsewhere.