Question about Chamberlain 3/4-HP Power Drive Chain Drive Garage Access System

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My chamberlain whisper drive, 3/4 hp, motor hums with 5 flashes. Door works o.k.

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  • Chamberlain Master
  • 12,718 Answers

Something in the drive is jammed preventing the motor from spinning. Correct the problem lest you will burn out the motor if allowed to hum and overheat.

Posted on Nov 24, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Hi there. I have a Chamberlain Whisper Drive

I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

Posted on Dec 17, 2009

swolfinor
  • 504 Answers

SOURCE: door would not close all the way

DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

Posted on May 27, 2010

blanchettohd
  • 143 Answers

SOURCE: The belt on my Chamberlain Whisper Drive dipping

Where the belt attaches to the trolley carriage which attaches to the door there is a black adjustment nut with a spring on it. Tighten it up more by turning it clockwise until the belt tightens up. The belt will droop a little when the door is all the way shut normally but should not during operation. If you tighten it up too much the belt will slap on the rail during operation. Make sure the spring is set on the adjustment screw too. This holds the belt tight over time. Thanks BB

Posted on Oct 11, 2010

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1 Answer

Chamberlain whisper drive residential door opener model LW3500 stops after perhaps 2 seconds, lights flash and door will not open or close


Page 36 owners manual.

35
Operation
Diagnostic Chart
Your garage door opener is programmed with
self-diagnostic capabilities. The "Learn"
button/diagnostic LED will flash a number of times
then pause signifying it has found a potential issue.
Consult Diagnostic Chart below.
Installed
Safety Reversing
Sensor
"Learn"
Button
Safety Reversing
Sensor
Bell Wire
Diagnostics Located
on Motor Unit
LED or
Diagnostic
LED
1 Flash
Safetyreversing
sensorswire open
(broken or
disconnected).
OR
2 Flashes
Safetyreversing
sensorswire shorted
or black/white wire
reversed.
Symptom:
One orbothof the Indicatorlights onthe safety
reversingsensors donot glow steady.
l
Inspectsensor wiresfor a short(staple in wire),correctwiring
polarity(black/white wiresreversed),broken or disconnected
wires,replace/attach asneeded.
l
Disconnectall wiresfrombackofmotor unit.
l
Remove sensorsfrombracketsand shorten sensor wiresto
1-2 ft.(30-60 cm) frombackeach ofsensor.
l
Reattach sending eye to motor unitusing shortened wires.If
sending eye indicator lightglowssteadily,attach the receiving
eye.
l
Align sensors,ifthe indicator lightsglowreplace the wiresfor
the sensors.Ifthe sensor indicator lightsdo notlight,replace
the safetyreversing sensors.
3 Flashes
Door control or wire
shorted.
Symptom:
LEDis not lit ondoorcontrol.
l
Inspectdoor control/wiresfor a short(staple in wire),replace
asneeded.
l
Disconnectwiresatdoor control,touch wirestogether.If
motor unitactivates,replace door control.
l
Ifmotor unitdoesnotactivate,disconnectdoor control wires
frommotor unit.Momentarilyshortacrossred and white
terminalswith jumper wire.Ifmotor unitactivates,replace
door control wires.
4 Flashes
Safetyreversing
sensorsslightly
misaligned (dimor
flashing LED).
Symptom:
Sendingindicatorlight glows steadily,receiving
indicatorlight is dim orflashing.
l
Realign receiving eye sensor,clean lensand secure
brackets.
l
Verifydoor trackisfirmlysecured to wall and doesnotmove.
5 Flashes
Motor overheated or
possible RPMsensor
failure.Unplug to
reset.
Symptom:
Motorhas overheated; the motorunit does not
operate ortrolley is stuck onstopbolt =Motorunit hums briefly;
RPMSensor=Short travel6-8"(15-20 cm).
l
Unplug unitto reset.Tryto operate motor unit,check
diagnosticcode.
l
Ifitisstill flashing 5 timesand motor unitmoves6-8"(15-20
cm),replace RPMsensor.
l
Ifmotor unitdoesn'toperate,motor unitisoverheated.Wait
30 minutesand retry.Ifmotor unitstill will notoperate replace
logicboard.
6 Flashes
Motor CircuitFailure.
Replace Receiver
LogicBoard.
Symptom:
Motorunit doesn't operate.
l
Replace logicboard because motor rarelyfails. https://www.chamberlain.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A4252.pdf

Jun 30, 2017 | Building Materials

1 Answer

Chamberlain Whisper Drive 3/4 HPS Garage Door Opener beeping


Change battery , not change battery the unit will not operate if there is a power failure.backup operation. 5 years is a long time on a disposable battery.

May 11, 2017 | Chamberlain 3/4-HP Whisper Drive Plus...

1 Answer

Door goes 3/4 way down


The motor thinks there is an obstruction, Try greasing any moving parts, They are tricky to set up right and you may have to get the door adjusted and serviced.

Mar 08, 2012 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

I have a chamberlain whisper drive garage door opener. When I open the door and it reaches the top it starts making a loud noise. It's like the motor is still trying to pull the door up but it can't...


SOUNDS LIKE THE UP LIMIT IS EITHER OUT OF ADJUSTMENT OR NOT WORKING.

TURN IT ABOUT THREE TURNS COUNTER CLOCKWISE. THIS SHOULD BE ENOUGH TO MAKE IT NOT OPEN ALL THE WAY. THEN ADJUST IT 1/2 TURN AT A TIME THE OTHER WAY UNTIL IT GETS CLOSE THEN SMALLER ADJUSTMENTS TILL YOU ARE HAPPY WITH WHERE IT STOPS.

HOPE THIS HELPS

Nov 04, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

2 Answers

(Chamberlain 1/2 hp Whisper Drive garage door opener) the garage mounted opener will open the door, but none of the remotes now work. batteries have been changed already. Is there a way to reprogram the...


If the wall button will operate the door up but none of the devices do then look at the wall button. Find the lock button and push it for 2 seconds and then try the remotes again. This is your vacation lock. You can get a manual at chamberlain.com. Now if the door does not open or close with the remotes you can reprogram them. Press the colored learn button on the motor head and then press the button on the remote. Repeat for each remote. If they fail to program you will need a new logic board. Thanks BB

Aug 18, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

Door would not close all the way


DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

Jan 19, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

Hi there. I have a Chamberlain Whisper Drive


I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

Nov 07, 2009 | Chamberlain 1/2-HP Whisper Drive Belt...

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