DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > AC compressor fan comes on for a couple seconds then shuts down.




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Old 05-26-2010, 07:32 PM  
tpeerson
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Default AC compressor fan comes on for a couple seconds then shuts down.

Looking for insight please to a possible cause of this problem.

When the contactor engages the compressor fan comes on for 1, maybe 2 seconds and then the contactor disengages, turning off the fan. The fan isn't on long enought to get up to speed. Press on the contactor (with an insullated screwdriver) and the fan will come up to speed. Remove the screwdriver and the contactor disengages.

Thanks!



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Old 06-04-2010, 03:32 PM  
kok328
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check for constant 24VAC to the coil on the contactor. That's what engages the contactor. You may have a low pressure switch that is cutting power to the coil.



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Old 06-26-2014, 09:15 AM  
thegoodguy
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i have a trane package unit. 3 ton compressor. the contactor closes but only for about 10 minutes or so. then makes clicking noises like if it opens and closes really fast. changed compressor,relay,lockout relay, tranformer,contactor,capacitor. ? any idea what it could be ?

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Old 06-26-2014, 09:20 AM  
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how many low pressure switching would be in this unit? and how do i test to see if there good?

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Old 06-26-2014, 10:14 AM  
Wuzzat?
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Quote:
Originally Posted by thegoodguy View Post
for about 10 minutes or so. then makes clicking noises like if it opens and closes really fast.
I'd look for a bad connection to account for this oscillation, just like dirty battery terminals will make your starter relay click rapidly.
This connection might take 10 minutes to heat up and become flaky and it will probably feel hot in the final minutes. And, the 240v measured at your unit on an analog meter will have the needle waving back and forth.


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