Chamberlain 1/2hp won't open/close and learn LED flashes 5 times
My Chamerlain 1/2hp opener won't open or close, and the motor hums for a few seconds when I try to activate it. It actually sounds as if the motor tries to move in one direction then the other before it stops. Also, the LED light next to the transmitter button flashes 5 times, pauses for three seconds, then repeats the 5-flash cycle. Any ideas?
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5 flashes of the LED is the code for "RPM sensor or motor overload." You can try unplugging the opener for about 15 minutes to see if it resets itself. Normally if it is the RPM sensor the motor will run for a few seconds and then turn off. Is the door not opening or not closing? Just checking to make sure.
That is not a reset button it is the smart/learn button and is used to program remotes. If you mess with that button you can erase the memory and none of your remotes will work.
The code you are seeing with the 5 flashes of that small LED is "RPM sensor or motor overload". Your RPM sensor could be going bad but you should try increasing the down force first. The down force is a control in the same area as the smart/learn button. Increase this a bit.
If your main light flashes 10 times and the door reverses to the open position when you use your remote it is a door sensor problem. It is sometimes very hard to see if one of the sensor lights is flickering.
If the main light does not flash then you can try increasing the down force just a little. This control is on the rear of the motor unit near where all those white wires go.
Check the small LED near the smart/learn button. If it is flashing a code of 5 blinks then a pause and 5 blinks it is the RPM sensor. This is a small printed circuit board just in front of the motor.
The unit is flashing the code for 'motor overheated or RPM sensor failure'. If the door is stuck in the open position it could be because the trolley is jammed against the bolt just in front of the motor unit. Remove the bolt and run the opener until the door is closed. Now on the side of the motor unit you will find the 'up limit' adjustment. Turn this 2 full turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.
Look at the LED light next to the
SMART/LEARN button on rear of the motor unit. You may need to remove
a light lens cover in order to see it. If the light is flashing
rapidly this means you have a stuck button on one of your remote
controls. Take the batteries out of each remote control. When you
remove the batteries from the bad remote, the light will stop
flashing. This remote needs to be replaced.
If one of your neighbors remote
controls is inadvertently programmed into your receiver, you door
will open when their remote is activated. If this happens you will
need to clear out your receiver and reprogram your remote controls.
Press and hold the smart/learn button for 6 seconds or until you see
the small LED light near the button turn itself off. If the above
steps have been followed and the symptoms continue, there may be an
electronic short in either the wall control button or the receiver
logic board. In this case, remove the wall control wires from
terminals 1 and 2 on the motor unit. Should the symptoms persist
after the wires are removed, replace the receiver logic board. If the
symptoms stop with the wall control wires removed from the motor
unit, replace the wall control button, and the wires leading to the
wall control button.