my garagedoor will go up but i press the button to go down the door will start to go down but then the light on the garage door will blink and the door will stop or start to go down and return to the up position
the door is free from obstructions and the infra red is clear.if i let the door down manually and resetthe control it will then open the door but then it will not close again.
Hello and welcome to Just Answer.
Sounds like a sensor problem. Try holding down the wall button to close the door. If if closes then the sensors are the problem because holding the wall button overrides the sensors.
If you need further help or clarification on this answer, please do not hesitate to reply to this post.
I have tried holding down the button but the door will still not go down
I would say that your sensors are fine then.
Sounds like the RPM sensor is most likely defective and needs to be replaced.The RPM sensor is a little circuit board located at the door end of the motor shaft, inside the motor unit. They are relatively easy to purchase and install. The RPM sensor is what causes the door to reverse when it hits something. When the door hits something the logic board doesn't receive the pulses sent by the sensor and it reverses. When this sensor goes bad the door will start down and the logic board will not receive the electronic pulses and it will reverse, just like yours is doing. Take the cover off the unit and you will see a black cap on the end of the shaft that rotates between infrared sensors. That small circuit board is the RPM sensor.