Condensor fan will not stop. Need help ! Thanks

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Old 07-21-14, 08:11 AM
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Cool Condensor fan will not stop. Need help ! Thanks

New here, 1st post. I'm Retired so I'd like to save money & doitmyself
I've just read through many of these threads and tried what was recommended, but nothing worked.
The outside condenser fan will not stop after AC reaches desired temp.
If I set the control on the thermostat to OFF from COOL, it still runs.
I have to turn off the breaker to shut the system down to stop the condenser fan from running.
The outside system worked fine at the start of the season a few months ago, but started to do this a couple of days ago.
I just changed the thermostat with an old one, hoping that would be the problem, but it still did the same thing,
so its not the thermostat.
No one has serviced or touched the outside unit for several years.
I checked the wires on the connector and they all appeared to be fine.
I am going back out now to make sure a rodent didn't chew a wire to short it out or something, but a first look last night didn't show anything.
Can the Connector ever go bad & would it be worth replacing ?
Is there some kind of a switch on the fan that might have gone bad?
Thanks in advance for any advice !
 
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Old 07-21-14, 08:34 AM
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Sometimes a stuck relay can cause it to continue running though I most often see it with the air handler blower. Gently taping on the relay that controls the fan with the plastic handle of a screwdriver can sometimes make it turn off and helps narrow down the cause.

Also, post the brand and model number of your unit so the pro's can provide more help.
 
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Old 07-21-14, 09:42 AM
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Is it just the condenser fan that's running, or the compressor & fan (whole outside unit)? If it's both, then it could be a bad contactor. The contactor is a relay that switches the 240VAC for the compressor and condenser fan. The contactor is controlled by the 24VAC sent from the thermostat. When the thermostat calls for cooling, a relay in the thermostat gets energized which sends 24VAC to the contactor coil, energizing it and pulling the contacts in, completing the 240VAC circuit. Sometimes the contacts "stick" and even when the thermostat stops calling for cooling (no 24VAC present at contactor coil), the contactor stays closed. However, if this is the case, both the compressor and condenser fan would be running (they're wired in parallel).
 
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Old 07-21-14, 09:47 AM
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If the fan and compresser keep running then the contactor may be stuck. I would go ahead and change the contactor.
 
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Old 07-21-14, 11:29 AM
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Thanks a million for the quick feedback.
Only the fan continues to run. The compressor shuts off.

I will try to tap on the fan relay as suggested & let you know if that helps.
Its an Amana, and is pretty old. I will also get the model number.
(I take pretty good care of it. It was installed in 1990, so its 24 years old.)
Finishing lunch now will post results in about 1 hour.
Again Thanks a Million for all of your help !
 
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Old 07-21-14, 11:36 AM
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The contactor controls both the compressor and fan at the same exact time. So if your compressor is shutting off but the fan continues to run it's not a contactor problem.

That sounds to me like a defective motor. One of the windings may have a short in it..... so that combined with a single pole contactor could keep the fan running.
 
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Old 07-21-14, 01:47 PM
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OK, I went outside , and excuse my ignorance, but I couldn't locate a Fan Relay ?? In the electric compartment I see the connector & the capacitor.
I attached a photo.

Then What I just did was:
1.) Push down on all of the connections to make sure they were tight.
2.) Then for the 3 wires that run into the fan motor, I grabbed them about
3 inches from where they enter the fan, and pushed them into the fan motor.

Now the damned thing seems to be working OK !!
The fan now cycles off when the thermostat temperature setting is reached & the compressor stops. Go figure.

I will have to keep an eye on it.

The Make is an AMANA, and the MFG number is P1197908G (G or C ?) , didn't see a model number.

( I live in northern Ohio near lake Erie, and have trees around my house so the AC usually only comes on June through Aug for a few sort times later in the day. So it does not labor all day, so that's why its lasted this long )
 
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Old 07-21-14, 01:57 PM
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That is the single pole contactor in your picture. There is no fan relay.
 
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Old 07-21-14, 02:19 PM
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<That sounds to me like a defective motor. One of the windings may have a short in it..... so that combined with a single pole contactor could keep the fan running. >

PJmax, thanks for all of your help. Really appreciated ! Looks like the fan motor is the problem.

" Mighty Mouse will save the day ! "


And thanks to everyone else for your help too. Hope I can return the favor someday !
 
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