Blower Motor Runs Then Shuts Off Later Comes on Again

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05-04-2010, 05:56 PM

ii posts, read 87,142 times Reputation: xix

My home A/C blower motor runs for a few hours, and so will not first again after reaching set temperature. I tin can turn the A/C switch off at the thermostat and expect a while (near an hour, and then turn information technology on again and the blower will work again. When the blower motor is non working and I plow the temperature downwards at the thermostat, I can hear buzzing at the breaker panel as if the motor is pulling power but doesn't start. Would this exist the blower motor starting to become bad?

05-04-2010, 10:24 PM

21,340 posts, read 63,727,794 times Reputation: 41739

Could be, but it also could be ice building up on the coil and freezing the motor into position. That might mean something equally simple as adjusting the charge of refrigerant, or as bad as replacing the coil or more.

05-05-2010, 04:59 AM

Barking Spider Location: Knoxville iv,667 posts, read 23,821,005 times Reputation: 5899

Yous should probably have information technology checked out past a professional, since no i on this forum tin can really tell y'all whats wrong without seeing it in performance. Its all just guesswork. That said, there are a few things yous can do to maybe go an idea of what could be incorrect. 1. When it is running, the air coming out of the top should be warm to hot. That will tell you lot that at that place is something going on. 2. If the exterior unit coils are icing up, then its probably depression on refrigerant and you need a professional to re-charge it. iii. Y'all tin can go a rough idea on how well its running by feeling the refrigerant lines afterward its been running 20 minutes or so. If you look at the bottom of the outside a/c unit of measurement, you will run across 2 copper pipes. One is 3/4" diameter and is usually covered with black foam insulation, the other pipe is much smaller, well-nigh 3/8" diameter and not covered with the black insulation. Feel the large pipage while the unit is running and it should be very cold and perchance fifty-fifty a little moist. The smaller pipe will be much warmer and might even be hot to the impact. If the large pipe is NOT cold after the unit has been running about 20 minutes, and so you lot are probably low on refrigerant or have a problem with the compressor. In that location are lots of things that can crusade the loss of refrigerant. In my area a/c units concluding about 12 - 14 years, and so if the unit is adequately old, it may just be worn out. Whatever you may find out on your own, you will nonetheless need a professional to gear up it. Y'all might as well just call them at present.

05-05-2010, 05:09 PM

two posts, read 87,142 times Reputation: 19

I'd like to thanks both for your advice! Information technology is not the outside unit blower fan that is stopping, information technology is the inside unit blower fan that turns off (air handler). The starter capacitor is new - I only changed it during the winter. Practise you think it could be the air handler blower motor?

05-05-2010, 09:55 PM

21,340 posts, read 63,727,794 times Reputation: 41739

"Do you retrieve it could be the air handler blower motor?" Non being smartazz, but my response is the same. Could be, but it also could be water ice building upwards on the coil and freezing the motor into position. That might mean something every bit simple as adjusting the accuse of refrigerant, or as bad as replacing the coil or more.

05-06-2010, 04:51 AM

Barking Spider Location: Knoxville 4,667 posts, read 23,821,005 times Reputation: 5899

Breaker in electrical panel buzzing???? Might be a bad breaker. If yous plough the thermostat to FAN - ON instead of AUTO, will the fan proceed to run without stopping? If it does, only so quits when you turn it back to car (and running a/c), so it could be.... 1. Stuff we talked about earlier 2. Thermostat and or wiring, or controls

eleven-01-2010, 09:56 AM

herdingcats 1 posts, read 42,738 times Reputation: xi

I have the EXACT aforementioned problem and the experts have been out iii times so far and haven't been able to correct the trouble. The terminal fourth dimension they came out, the unit was iced over. So far, nosotros've replaced the thermostat, the blower fan motor and a time delay module and the problem still persists. How can I locate someone who knows how to properly troubleshoot the organisation without just guessing and replacing parts? Besides the unit of measurement is but 6 months old....... If we are able to get to the lesser of the issue, I will post the findings.

07-30-2011, x:50 AM

Sarahlaine i posts, read 42,049 times Reputation: 11

I have the exact same upshot. First time out, our guy replaced the capacitor considering when he saw it it looked like information technology was about to explode. Side by side time out, we take a make new unit outside b/c our compressor was going bad. Then, it even so would kick on and run, simply once information technology got to temp it would shut off then never come up dorsum on again. And then, we left information technology in the on position. So, everything would run fine and virtually 4am the fan would kick on and off multiple times within a minute, finally to shut off and not come up back on at all. The compressor outside would withal run though. Nosotros replaced the thermostat yesterday and again, about 2am, information technology close off and turned on multiple times and and then finally shut off. The compressor ran all night and when I went down to check this morning time, it was iced over exterior and inside (nosotros have one small portion that the insulation is not covering). This happens b/c blower isn't blowing warm air over it to continue the A coil from icing over. Whatsoever ideas?

09-02-2011, 08:36 PM

microdisney 1 posts, read 41,806 times Reputation: 12

A quick fashion to dominion out the windings. I had this same outcome where my upstairs air handler blower would run fine for similar two+ hours, cool to desired temp and so afterwards shutting off, the next fourth dimension it would cycle off and on every few minutes. The compressor would stay on and so I constantly had to monitor the blower and manually shut information technology off at the t-stat. At first I idea it was the control board, and then I swapped it out with the downstairs unit but still the same behavior. I then turned the manual fan to on without cool and it ran directly with no problems so then I idea it might be the high speed windings. Sure plenty it was. Most command boards will accept terminal markings that say cool, heat, park etc. I switched the loftier speed wire with the parked medium speed wire and it works like a charm. I'll replace the motor when it gets a little cooler and I can bargain with not having upstairs air-conditioning for a few days. Btw, the manual fan without any temp is usually the boring speed which is used past the heater.

04-23-2013, 03:43 PM

usher68 2 posts, read 41,309 times Reputation: 11

I HAVE the verbal aforementioned problem..while mine is running it lags at times..I am looking into the resister.if that goes out.information technology disrupts the thespeed.ofthe motor.if you havehad any success plz let me know.thx) Quote: Originally Posted by RC_0852 My home A/C blower motor runs for a few hours, and so will non outset again after reaching set temperature. I can turn the A/C switch off at the thermostat and wait a while (about an 60 minutes, then turn information technology on once again and the blower volition work once again. When the blower motor is not working and I turn the temperature downwardly at the thermostat, I tin can hear buzzing at the breaker panel as if the motor is pulling power only doesn't start. Would this be the blower motor starting to go bad?

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