Air Handler Blower Runs For 20 Seconds Then Stops For 3 Seconds - HVAC - DIY Chatroom Home Improvement Forum


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Old 09-27-2012, 06:47 PM   #1
John Ross
 
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


Tempstar Air Handler FXM4X4800A1 Installed 09/2010.Tempstar Heat Pump TXH548GKA100 Installed 09/2010A/C system controlled by Carrier Comfort Zone 4 Zone System installed in 1992.

When AC comes on the Air Handler Blower runs for about 20 seconds then stops for 3 seconds then runs for about 20 seconds. This happens the entire time the system is running.

I turned the thermostats Heat Switch Off & the Cool Switch Off and turned the fan Switch from AUTO to ON & the blower motor did the same thing, blower runs for about 20 seconds then stops for 3 seconds then runs for about 20 seconds.


NO burning or other smells coming from the AC unit.


I opened the air handler service panel and this unit has a ECM Motor.

The blower wheel (squirrel cage) spins freely and is quiet.


The evaporators metal housing has what appears to be rust on the side under each of the copper lines where it comes out of the evaporator and goes back in. Not sure if this is normal for a 24 month old unit?


The evaporator coils fins are clean.

Other than shutting off & turning back on problem the system runs fine & the house is cool.

All three filters have been replaced.

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Last edited by JohnRoss; 10-06-2012 at 07:46 PM.
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Old 09-27-2012, 08:00 PM   #2
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


So the blower dosent get a chance to even stop rotating ? how does it let you know its shuting down and restarting ?

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Old 09-28-2012, 03:33 AM   #3
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


So the blower doesn’t get a chance to even stop rotating?
Yes, blower never stops rotating.

How does it let you know its shutting down and restarting?
Air stops coming out of the vents.
All three returns stop pulling air.

Last edited by JohnRoss; 09-29-2012 at 11:57 AM.
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Old 09-28-2012, 09:17 AM   #4
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


The blower motor has a bad run capacitor.
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Old 09-28-2012, 10:58 PM   #5
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


if the blower dosent stop rotating , how does the air stop moving ?
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Old 09-29-2012, 10:03 AM   #6
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


The OP said it stops for 3 seconds so, the fan would slow down thereby lessening the air flow to a point that the flow would stop or not be noticeable at the supply registers.
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Old 09-29-2012, 11:36 AM   #7
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


Quote:
Originally Posted by Fairview View Post
The blower motor has a bad run capacitor.

I opened the air handler service panel and this unit DOES NOT have a run capacitor.
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Old 09-29-2012, 12:48 PM   #8
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


Find the blower's wires at the control board terminals, use a multi-meter to see if the power is cut off during those 3 seconds.
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Old 04-29-2013, 12:19 PM   #9
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


I just found a VERY Honest HVAC repair company that quickly diagnosed this problem today 04/29/13.

A component inside the X-13 blower assembly motor was bad. The technician told me Tempstar has had a lot of problems with the X-13 motor and he has replaced a lot of them.

AC is now up and running without shutting off every 20 seconds as it did before.

Last edited by JohnRoss; 04-29-2013 at 12:24 PM. Reason: Problem Correctly Diagnosed
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Old 04-30-2013, 08:18 AM   #10
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Air Handler Blower runs for 20 seconds then stops for 3 seconds


Its not just tempstar having trouble with the x-13.

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