My Genie garage door closes fine on all occasions but it won't open unless I hold the wall button down. This causes real hassle as I can't use my remote opener to open the door as well.
Here is what happening...
When it is fully open or close, left sensor - solid red, right sensor - solid green. If I block the sensors, left sensor blinks red, right sensor stays solid green.
If it is close and I press the wall button and let go, door would open an inch or so and stop. No flash on motor unit light bulb.
If the door is closing and I block the sensors, door stop immediately (does not bounce back up).
What could be the problem/s and how to fix? Thanks in advance.