24
B
Symptoms and Solutions
SYMPTOM: The Door Will Move About A Foot, Then Stop. After Stopping, Only Constant Pressure
Commands Will Move The Door
POSSIBLE CAUSE: SOLUTION:
RPM sensor is not connected properly or may need to
be replaced
a) Check the RPM assembly for loose connections. Check
the Interrupter Cup to ensure it turning when the
operator is running. Check for foreign matter blocking
the optical lens.
b) Replace RPM sensor.
SYMPTOM: The Door Will Move Most Of The Way Towards A Limit, Then Stop. An Extra Open Or Close
Command Is Able To Get Door To Complete Cycle
POSSIBLE CAUSE: SOLUTION:
The Maximum Run Timer is not set correctly Manually reprogram the Maximum Run Timer OR reset
to factory defaults.
SYMPTOM: The Door Will Open Partway And Stop. A Second Open Command Is Needed To Open The
Door Completely.
POSSIBLE CAUSE: SOLUTION:
There may be a Mid-Stop set Check to see if the Mid-Stop LED is on. Clear the Mid-
Stop by turning the selector dial to program. Press and
hold the Mid-Stop button for 5 seconds. Return dial to
desired wiring type.
SYMPTOM: The Door Will Open But Will Only Close After A Five Second Delay With Constant Pressure
On The Close Button
POSSIBLE CAUSE: SOLUTION:
The photoelectric sensor, sensing edge or other
entrapment protection device is obstructed or activated
If the on-board EYES LED is fl ashing, the photo-eyes are
misaligned or not connected. Remove any obstructions;
check the safety device wires for continuity or a short.
The logic board thinks the photoelectric sensors are
attached and blocked
Erase the LMEP device; turn the selector dial to DIAG,
push and hold the stop button until the MAS LED fl ashes.
If a LiftMaster entrapment protection device is not
connected the only modes of operation are C2, D1 or E2.
Failsafe switch set (L3 only) Slide switch to Non-Failsafe mode.
SYMPTOM: The Operator Will Not Respond To Any Commands
POSSIBLE CAUSE: SOLUTION:
Possible accessory malfunction Disconnect all devices; reattach one at a time testing for a
failure after each one is replaced.
Possible logic board failure Replace logic board.
Industrial Duty Logic Operators
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