Chamberlain K001D8395 - Control Station Commands Ignored

36
C
Mechanical Operators
Symptoms And Solutions
SYMPTOM: Door Drifts After The Operator Is Shut Off
POSSIBLE CAUSE: SOLUTION:
Brake needs adjusting (if present) Check and adjust brake.
Door poorly balanced Check and adjust door/springs.
SYMPTOM: Door Travels Down And Then Stops And Reverses
POSSIBLE CAUSE: SOLUTION:
A sensing device is being activated Check wiring of the sensing device.
Radio receiver may be sending a long signal
to the operator; this can cause the operator
to travel down off the open limit, then reverse
again
Try disconnecting the receiver. If the problem disappears, use a
LiftMaster Brand Receiver
SYMPTOM: Door Opens And Then Stops Short Of The Full Open Position
POSSIBLE CAUSE: SOLUTION:
Limit nut not set correctly Adjust limit nut.
An obstruction may be preventing the proper
operation of the door
Check door for obstruction.
The clutch may need adjustment Check the sensitivity of the clutch.
Defective limit switch activating prematurely Check limit switch; replace if necessary.
SYMPTOM: Operator Does Not Open Or Close In Response To Command From 3-Button Control Station
POSSIBLE CAUSE: SOLUTION:
Bad wire to 3-button control station Recheck wiring.
Circuit breaker has tripped Reset circuit breaker.
Damaged transformer Check transformer and circuit for 24V.
If equipped with electric interlock, there may
be a poor contact to the interlock switch
Verify all interlock switches are working correctly and wiring is
making good contact.
Blown fuse Replace fuse.
SYMPTOM: The Door Will Not Close Completely
POSSIBLE CAUSE: SOLUTION:
The limit assembly depression plate is not
properly engaged with nylon limit nut
Check and adjust if necessary.
The door is binding or meeting an obstruction Look for obstruction.
Loose drive or limit chain can cause the chain
to “jump” the sprocket teeth
Check the chain as necessary. The limit chain can be adjusted/
tensioned at the electrical box assembly via two mounting screws.
SYMPTOM: Motor Runs In Wrong Direction
POSSIBLE CAUSE: SOLUTION:
Operator is upside down For MJ, install operator with motor toward the ceiling. For MT,
the electrical box and motor should be toward the floor. Correct if
necessary.
Motor is wired incorrectly Check and correct wiring.
Three-phase wires are in the wrong order Rearrange any two incoming three-phase power legs on the
terminal strip.