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Started By
Message
AC unit's fan won't turn off
Posted on 3/28/16 at 9:41 am
Posted on 3/28/16 at 9:41 am
We had a power outage overnight and since the power came back on, the fan won't turn off on the AC. I have the unit turned off at the thermostat, and I've even flipped breakers off/on. Solution?
11
Posted on 3/28/16 at 9:42 am to High C
Call an AC guy or replace your thermostat.
Posted on 3/28/16 at 9:43 am to High C
I'm jealous. Love the sound of the AC fan
Posted on 3/28/16 at 9:48 am to High C
quote:
I have the unit turned off at the thermostat, and I've even flipped breakers off/on. Solution?
you obviously didn't flip the right one...
Posted on 3/28/16 at 9:52 am to High C
My bet is a bad transformer,sorry.
Posted on 3/28/16 at 9:55 am to High C
If all other operations are normal with the exception of the continuous fan and the evap motor is not ECM (variable speed) the fan relay on the AHU is the culprit.
That's assuming you are talking about your indoor fan.
That's assuming you are talking about your indoor fan.
This post was edited on 3/28/16 at 9:56 am
Posted on 3/28/16 at 10:15 am to Tiger inTampa
Yes, it's the indoor fan. Outdoor not moving. Unless the breakers are labeled wrong, I've turned all of them off (I have two units). Still it runs.
Posted on 3/28/16 at 10:20 am to High C
Your breakers are labelled wrong because you still have power to the AHU. Cycle through all your 208-230v breakers until you hear the AHU shut down.
Posted on 3/28/16 at 10:26 am to Tiger inTampa
Got it shut off. Breaker was labeled "air handler". Now what?
Posted on 3/28/16 at 10:30 am to Tiger inTampa
quote:
Your breakers are labelled wrong because you still have power to the AHU. Cycle through all your 208-230v breakers until you hear the AHU shut down.
Most likely the indoor blower fan is 120V, I did not understand the op fully earlier and thought it was just coming back on after t6he breaker flip. My money is still on transformer though, could be thermostat but I doubt it.
Posted on 3/28/16 at 10:32 am to High C
Bad capacitor
Posted on 3/28/16 at 10:34 am to NoHairDontCare
quote:
Bad capacitor
Not even sure how to reply to that but OK
Posted on 3/28/16 at 10:35 am to High C
stuck relay?
Posted on 3/28/16 at 10:36 am to High C
How old is your unit?
My handler/furnace was old. The evaporator coil pan was leaking and affected the fan relay switch which was doing what yours is. The fan wouldn't shut off. In your situation, maybe a surge did something.
My handler/furnace was old. The evaporator coil pan was leaking and affected the fan relay switch which was doing what yours is. The fan wouldn't shut off. In your situation, maybe a surge did something.
This post was edited on 3/28/16 at 10:38 am
Posted on 3/28/16 at 10:39 am to High C
Bad capacitor.
Posted on 3/28/16 at 10:40 am to Gevans17
quote:yes. And to the idiot that said bad capacitor.
stuck relay?
Where do you people come from?
Posted on 3/28/16 at 10:41 am to LSUwag
quote:
Bad capacitor.
Posted on 3/28/16 at 10:43 am to High C
My vote is the fan relay got fried in the on position when power was restored.
$10 part at the HVAC supply house.
It can even be tested if you have some basic electrical knowledge and a multi-meter.
$10 part at the HVAC supply house.
It can even be tested if you have some basic electrical knowledge and a multi-meter.
Posted on 3/28/16 at 10:45 am to cave canem
quote:
My bet is a bad transformer,sorry.
fricking Decepticons.
EDIT: Put me in with the stuck relay/contactor camp. I guess it could also be a problem with other things in the control loop. But, failure of the control system would likely result in "not running" instead of "constantly running". My guess is that the control system is trying to de-energize the relay/contactor so that its spring can open the connection and break power to the fan. But, the physical connection that carries power to the fan was welded together by an arc at some point. So, even though the control system is de-energizing the relay to stop the fan, the spring in the relay isn't strong enough to break the weld and physically open the switch. So, the fan just runs. Start simple and work your way up from there.
This post was edited on 3/28/16 at 10:53 am
Posted on 3/28/16 at 10:45 am to Cdawg
Mine is ten years old. Something else that is the power company's fault, and I'm gonna have to pay for it.
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