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Side Discharge AC Not Cooling

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  • May 31st, 2020 2:03 pm
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[OP]
Jr. Member
Sep 10, 2006
124 posts
40 upvotes
Toronto

Side Discharge AC Not Cooling

Dear RFDers,

Our house has a side discharge / horizontal condenser AC unit and it is not cooling anymore.
Basically, the outside unit fan is running, and the indoor vents are blowing air just not cool air.
I also googled it, but for most "ac not cooling problems", the outside fan would not run.
Is it due to low in Freon? Its a bit hard for me to believe that as the unit is just 3 years old.
I also have a 3rd Gen Nest thermostat installed (already got rid of the old one) and not sure if it also can be the issue.

Any help will be greatly appreciated!

p.s. the unit looks like this
https://www.marsdelivers.com/item/CMA18 ... CONDENSER/
4 replies
Deal Addict
Oct 13, 2014
2148 posts
1384 upvotes
Just Moved To Somewh…
Check your circuit breaker and ensure it has a 240V breaker. It would not be the first time an installer used 120V, whereby the fan would run but not the compressor.
“Before one can have a Clue they must first accumulate 10 Inklings. That said, all it takes is one bad post and you erase all Inklings & Clues accumulated'"
[OP]
Jr. Member
Sep 10, 2006
124 posts
40 upvotes
Toronto
Thanks recmpvet! Not sure how to check the breaker but I think it should be installed correctly otherwise it will not pass the PDI...
I am just not sure if the Nest thermostat can be the issue as that is the only part I changed from last year.
Too bad that I already sold the old non-smart thermostat otherwise I can just put it back to test it...
rcmpvet wrote: Check your circuit breaker and ensure it has a 240V breaker. It would not be the first time an installer used 120V, whereby the fan would run but not the compressor.
Deal Fanatic
Jul 7, 2017
5698 posts
2510 upvotes
SW corner of the cou…
What s a side discharge unit? At any rate, I don't think any thermostat will turn on the compressor fan separately from the compressor. A single voltage contrl usually turns the compressor on or off (assuming it is a one-stage compressor). Compressor not starting could be as (relatively) simple as the contactor not engaging (culd be clogged with dirt, bug, corrosion, etc.) or perhaps the start/run capacitor gone InOp.
Cream rises to the top. So does scum.
[OP]
Jr. Member
Sep 10, 2006
124 posts
40 upvotes
Toronto
Thanks thriftshopper for the insight!
This is how my side discharge unit looks like... Its brand is called Comfort Aire. It looks like one of those mini split units but it is not ductless.
Thanks
thriftshopper wrote: What s a side discharge unit? At any rate, I don't think any thermostat will turn on the compressor fan separately from the compressor. A single voltage contrl usually turns the compressor on or off (assuming it is a one-stage compressor). Compressor not starting could be as (relatively) simple as the contactor not engaging (culd be clogged with dirt, bug, corrosion, etc.) or perhaps the start/run capacitor gone InOp.
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