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AC compressor running but fan not spinning

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AC compressor running but fan not spinning

Posted On: April 18, 2023

AC compressor running but fan not spinning

Hello everyone,


It's about AC season where I live and I did a trial run of the AC to check everything is working ok and the compressor is running but not the fan in the AC unit outside.


2 or 3 years ago this happened and giving the fan a push helped it running (the push was needed occasionally, most of the time the fan was running on its own).


It happened again a year ago and decided to investigate more and I ended up installing a new capacitor.


After that, it ran all season without any issues.


This year it happened again, I haven't tried much but thinking if the capacitor got discharged, it is draining, or do I definitely need a major overhaul/new AC?


Any help and pointers are appreciated.


I'm handy and can do most work on my own unless it requires special tools or considerable repairs.


Question from user chill-a-killer at AirConditioners at reddit.


Answer:


If the compressor is running but the fan is not, it could be due to a fault in the capacitor, motor, or wiring.


Based on your previous experience, it's possible that the capacitor is faulty again and needs to be replaced.


Capacitors can discharge over time, and if it is not holding the charge properly, it can cause the fan motor to fail.


Before replacing the capacitor, make sure to turn off the power to the unit and discharge the capacitor by shorting the terminals with an insulated screwdriver.


Then, remove the capacitor and test it with a multimeter to check its capacitance and voltage rating.


If it's not within the specified range, you may need to replace it.


If the capacitor is fine, then you may need to check the wiring and the motor.


Check if the motor is receiving power and if there is continuity between the motor windings.


If there is no power, check the wiring connections and fuses.


If there is no continuity, then the motor may need to be replaced.


In any case, it's worth investigating the issue before considering a major overhaul or replacing the AC unit.


However, if you are not comfortable working with electricity or do not have the necessary tools, it's best to call a professional to diagnose and fix the issue.


Answer from user BrysonCPA at AirConditioners at reddit.



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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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