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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876963
08/12/19 07:11 PM
08/12/19 07:11 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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outside coil probably dirty causing high pressure switch to trip or compressor thermal protection to throw go to a supply house get some sodium hydroxide condenser coil cleaner mix it about 1:4 and soak the outside coil down real good with a pump up sprayer the whole coil should be covered with foam inside and out once you get it on thick enough and rinse it off after 4 or 5 minutes make sure you rinse good its corrosive stuff. you said the fan shuts off and blows hot air so im assuming you mean the compressor quits running because a fan cant blow anything if its shut off. Will try this. Fins are definitely visibly dirty, not filthy but I can see a thin layer of stuff on them but there are a lot of bent up fins, too. What tool would yall recommend to straighten them out or just call someone to do it and pay them? a coil brush/rake about $8 at supply house it just some stiff wires laid out like a paint brush with a handle you run up and down the fins to straighten them out youll have to disassemble whatever type of material the unit has protecting the coil to do it its not hard just a few dozen screws usually
Last edited by GKelly; 08/12/19 07:15 PM.
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Re: AC fan keeps shutting off
[Re: strikeu]
#2876968
08/12/19 07:18 PM
08/12/19 07:18 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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one other thing we had happen...the sensor got an "over pressure" signal and shut off, had to be reset. I don't know jack chit about AC but they replaced the capacitor and cleared the over pressure alert. this was the second time I called Dallas Heating and Air...they're good folks by the way. this could also be the problem a weak capacitor will cause the fan to run slower and reject less heat causing the high pressure switch to throw id probably clean the coil and replace the capacitor all at the same time if i was servicing it just for insurance against a call back. assuming those are the 2 most likely causes is just an educated guess without actually putting gauges on it but are also extremely cheap DIY repairs id attempt if I was the OP before I pissed away a few hundred dollars to a service company. should be able to get coil cleaner and a capacitor for around $20-$25 make sure capacitor is the same microfarad as the old one and remember to put the common/fan/herm wires back on the right terminals. voltage rating on capacitors doesnt matter as long as its higher than the 240 service you have at the unit
Last edited by GKelly; 08/12/19 07:28 PM.
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876972
08/12/19 07:26 PM
08/12/19 07:26 PM
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Joined: Jun 2019
Posts: 3,496 Sylvania Alabama
Sandmtnslayer
10 point
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10 point
Joined: Jun 2019
Posts: 3,496
Sylvania Alabama
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Possibly fan getting hot kicking thermal overload then the compressor kicks itself out
Not all Indians were hunters some toted firewood
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Re: AC fan keeps shutting off
[Re: GKelly]
#2876973
08/12/19 07:27 PM
08/12/19 07:27 PM
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Joined: Dec 2012
Posts: 1,160 Opelika
noeyeddeer
OP
6 point
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OP
6 point
Joined: Dec 2012
Posts: 1,160
Opelika
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one other thing we had happen...the sensor got an "over pressure" signal and shut off, had to be reset. I don't know jack chit about AC but they replaced the capacitor and cleared the over pressure alert. this was the second time I called Dallas Heating and Air...they're good folks by the way. this could also be the problem a weak capacitor will cause the fan to run slower and reject less heat causing the high pressure switch to throw id probably clean the coil and replace the capacitor all at the same time if i was servicing it just for insurance against a call back. assuming those are the 2 most likely causes is just an educated guess without actually putting gauges on it but are also extremely cheap DIY repairs id attempt if I was the OP before I pissed away a few hundred dollars to a service company. should be able to get coil cleaner and a capacitor for around $20-$25 Thank you for this. How do I find what capacitor I need without removing the one on there? I looked at it but everything is so old it's hard to make heads or tails. Thanks for the replies!
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876980
08/12/19 07:31 PM
08/12/19 07:31 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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one other thing we had happen...the sensor got an "over pressure" signal and shut off, had to be reset. I don't know jack chit about AC but they replaced the capacitor and cleared the over pressure alert. this was the second time I called Dallas Heating and Air...they're good folks by the way. this could also be the problem a weak capacitor will cause the fan to run slower and reject less heat causing the high pressure switch to throw id probably clean the coil and replace the capacitor all at the same time if i was servicing it just for insurance against a call back. assuming those are the 2 most likely causes is just an educated guess without actually putting gauges on it but are also extremely cheap DIY repairs id attempt if I was the OP before I pissed away a few hundred dollars to a service company. should be able to get coil cleaner and a capacitor for around $20-$25 Thank you for this. How do I find what capacitor I need without removing the one on there? I looked at it but everything is so old it's hard to make heads or tails. Thanks for the replies! its printed on the old capacitor an is also usually printed on the compressor and the fan you will need the microfarad rating off each one because its more that likely a dual capacitor meaning it has a common terminal then one terminal for the fan and another for the compressor. the most common will be a 5/35 or 7.5/35 the lower number is the fan the higher number is the compressor marked Herm on the capacitor. the symbol you are looking for that tells you microfarad rating is μF dont worry about voltage rating as long as its rated over 240 the only thing that matters is the μF rating
Last edited by GKelly; 08/12/19 07:37 PM.
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876983
08/12/19 07:36 PM
08/12/19 07:36 PM
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Joined: Dec 2018
Posts: 2,070 Alabama
strikeu
8 point
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8 point
Joined: Dec 2018
Posts: 2,070
Alabama
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one other thing we had happen...the sensor got an "over pressure" signal and shut off, had to be reset. I don't know jack chit about AC but they replaced the capacitor and cleared the over pressure alert. this was the second time I called Dallas Heating and Air...they're good folks by the way. this could also be the problem a weak capacitor will cause the fan to run slower and reject less heat causing the high pressure switch to throw id probably clean the coil and replace the capacitor all at the same time if i was servicing it just for insurance against a call back. assuming those are the 2 most likely causes is just an educated guess without actually putting gauges on it but are also extremely cheap DIY repairs id attempt if I was the OP before I pissed away a few hundred dollars to a service company. should be able to get coil cleaner and a capacitor for around $20-$25 Thank you for this. How do I find what capacitor I need without removing the one on there? I looked at it but everything is so old it's hard to make heads or tails. Thanks for the replies! when you pull the main cover off the unit there's probably a wiring diagram inside it. mine was faded but those boys had magnifying glasses from planet Zirfuse add read the wiring scheme...but he said he already knew by looking at it...my suggestion is call a service guy. there are some things I have to admit I am just not good at...LOL
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Re: AC fan keeps shutting off
[Re: strikeu]
#2876986
08/12/19 07:40 PM
08/12/19 07:40 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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one other thing we had happen...the sensor got an "over pressure" signal and shut off, had to be reset. I don't know jack chit about AC but they replaced the capacitor and cleared the over pressure alert. this was the second time I called Dallas Heating and Air...they're good folks by the way. this could also be the problem a weak capacitor will cause the fan to run slower and reject less heat causing the high pressure switch to throw id probably clean the coil and replace the capacitor all at the same time if i was servicing it just for insurance against a call back. assuming those are the 2 most likely causes is just an educated guess without actually putting gauges on it but are also extremely cheap DIY repairs id attempt if I was the OP before I pissed away a few hundred dollars to a service company. should be able to get coil cleaner and a capacitor for around $20-$25 Thank you for this. How do I find what capacitor I need without removing the one on there? I looked at it but everything is so old it's hard to make heads or tails. Thanks for the replies! when you pull the main cover off the unit there's probably a wiring diagram inside it. mine was faded but those boys had magnifying glasses from planet Zirfuse add read the wiring scheme...but he said he already knew by looking at it...my suggestion is call a service guy. there are some things I have to admit I am just not good at...LOL diagram wont tell you μF ratings or resistance or much on anything except where the wires go i havent had to look at a diagram in years and you usually cant read them anyway on an old unit
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876992
08/12/19 07:50 PM
08/12/19 07:50 PM
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Joined: Jan 2014
Posts: 10,467 Scottsboro, Al
jbatey1
Lucky Bastage
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Lucky Bastage
Joined: Jan 2014
Posts: 10,467
Scottsboro, Al
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Nevermind. I read through the posts.
Last edited by jbatey1; 08/12/19 07:53 PM.
The fool tells me his reasons; the wise man persuades me with my own.
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2876995
08/12/19 07:51 PM
08/12/19 07:51 PM
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Joined: Jun 2019
Posts: 3,496 Sylvania Alabama
Sandmtnslayer
10 point
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10 point
Joined: Jun 2019
Posts: 3,496
Sylvania Alabama
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I personally don't think it's a cap if it was it wouldn't start up but give me model number and serial number and I will look up what cap u need
Not all Indians were hunters some toted firewood
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2877000
08/12/19 07:54 PM
08/12/19 07:54 PM
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Joined: Aug 2012
Posts: 644 Enterprise
stuball
4 point
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4 point
Joined: Aug 2012
Posts: 644
Enterprise
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Sound like what happened to me, ended up fan motor itself would get to hot and stop. Run water on it to cool it down then would start working again. Nothing else would be wrong except blow hot air.
Do the hard right verses the easy wrong
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Re: AC fan keeps shutting off
[Re: Stob]
#2877006
08/12/19 07:58 PM
08/12/19 07:58 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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You got ants in your contacts. Lol No lie, this actually happened to ours once. this is actually a really really common problem but is not the OPs problem or nothing outside would run I recomend people put ant killer around their units regularly i keep a bag with me to put out if i ever have to replace a contactor due to ants.
Last edited by GKelly; 08/12/19 08:00 PM.
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Re: AC fan keeps shutting off
[Re: noeyeddeer]
#2877060
08/12/19 08:29 PM
08/12/19 08:29 PM
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Joined: Dec 2007
Posts: 4,319 alabama
BigEd
10 point
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10 point
Joined: Dec 2007
Posts: 4,319
alabama
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Amazon for the capacitor. Supply houses have got where they won't sell to a guy unless he is an AC tech. This is what I found for the capacitor and that model #. 45/5
Last edited by BigEd; 08/12/19 08:31 PM. Reason: added capacitor info
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Re: AC fan keeps shutting off
[Re: Sandmtnslayer]
#2877061
08/12/19 08:29 PM
08/12/19 08:29 PM
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Joined: Apr 2017
Posts: 4,597 Elmore county
GKelly
10 point
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10 point
Joined: Apr 2017
Posts: 4,597
Elmore county
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I personally don't think it's a cap if it was it wouldn't start up but give me model number and serial number and I will look up what cap u need assuming no one has ever replaced the fan motor with a different rating best thing to do is replace the capacitor with exactly what you took out
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