Front air compressor on mh will not kick on hum only

I that AC unit hasn't been running for a while, try going up on roof, take a long stick or thin rod with you and and try poking it through the openings and turn the fan at the rear , a few complete rotations, then have someone inside, after you take stick or whatever out, try starting it in fan mode & see if fan runs. If it does, let it run for 5 minutes or so, and then try it with AC on. Sometimes the fan will get a dead spot from sitting, and this usually gets it going again. If not, take cover on roof off, (watch for bees & wasps) and give fan a good spin by hand. If it still won't go after that, you need a new fan start capacitor. Keep me posted. I"ve had about 10 units this year that did the same thing and 80% are fine after spinning the fan. Just make sure when you get it working again, to use it once in a while to keep everything working.

I that AC unit hasn't been running for a while, try going up on roof, take a long stick or thin rod with you and and try poking it through the openings and turn the fan at the rear , a few complete rotations, then have someone inside, after you take stick or whatever out, try starting it in fan mode & see if fan runs. If it does, let it run for 5 minutes or so, and then try it with AC on. Sometimes the fan will get a dead spot from sitting, and this usually gets it going again. If not, take cover on roof off, (watch for bees & wasps) and give fan a good spin by hand. If it still won't go after that, you need a new fan start capacitor. Keep me posted. I"ve had about 10 units this year that did the same thing and 80% are fine after spinning the fan. Just make sure when you get it working again, to use it once in a while to keep everything working.