Home & Garden

Air Conditioning not working

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  • Sep 23rd, 2021 11:06 pm
[OP]
Deal Addict
Aug 22, 2009
1712 posts
1237 upvotes

Air Conditioning not working

We had a rather large storm last night that knocked the power out.

Since then the house has been heating up

I went outside and the A/C seems to be running, but in the house there is no air coming from the vents.

I checked the A/C and furnace breakers and turned them both off then on.

Any ideas?

I’m assuming there is a fan involved that isn’t moving the air, but not sure how to trouble shoot it
17 replies
Penalty Box
Aug 21, 2010
1432 posts
702 upvotes
toronto
my guess its the capacitor on the air conditioning unit..see if its bulged
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Deal Addict
Sep 22, 2009
3210 posts
2016 upvotes
Markham
Easto wrote: We had a rather large storm last night that knocked the power out.

Since then the house has been heating up

I went outside and the A/C seems to be running, but in the house there is no air coming from the vents.

I checked the A/C and furnace breakers and turned them both off then on.

Any ideas?

I’m assuming there is a fan involved that isn’t moving the air, but not sure how to trouble shoot it
It sounds like the blower (inside your furnace) is not running.
Sr. Member
Jun 23, 2019
509 posts
346 upvotes
Check the furnace control board fuse first.
Deal Addict
Jun 16, 2009
3685 posts
2165 upvotes
Woodbridge
Either the below OR you might have a leak in refrigeration lines which causes A coil to freeze up. When A coil above the furnace freezes up, you don’t get any air flow either.
It is not uncommon for the board on the furnace to be fried after the major power surge.
You can do basic troubleshooting. First step would be to check if your blower on the AC is working. Try setting the fan ON from your thermostat. You should feel some air from the vents.
BDSL wrote: It sounds like the blower (inside your furnace) is not running.
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Deal Guru
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Mar 13, 2004
12915 posts
4519 upvotes
Ontario
I would be leaning toward a blown fuse on the furnace or capacitor on the blower motor in the furnace due to the power going out (ideally one of these) Or the board or something got fried because of it. As others have said you can check for fuses and such and maybe you will get lucky but if not you will need to reach out to an HVAC Company to investigate more. If you are in the GTA reach out to @newlyborn Hes one of the highly recommended HVAC companies here on RFD & will give you honest advice and not just try to sell you a new system.

Good luck
Easto wrote: We had a rather large storm last night that knocked the power out.

Since then the house has been heating up

I went outside and the A/C seems to be running, but in the house there is no air coming from the vents.

I checked the A/C and furnace breakers and turned them both off then on.

Any ideas?

I’m assuming there is a fan involved that isn’t moving the air, but not sure how to trouble shoot it
Deal Addict
User avatar
Sep 27, 2006
4871 posts
1761 upvotes
Not so easy there Ma…
It likely isn't a fuse or breaker issue if the thermostat has power.
[OP]
Deal Addict
Aug 22, 2009
1712 posts
1237 upvotes
Basically, I had someone come check it out.

He unplugged a couple wires and plugged them back it.

Wiggled a few things

Tested it and the blower fan came on.

He honestly didn’t know what he did to make it work.

So….. who knows
Deal Addict
Jun 16, 2009
3685 posts
2165 upvotes
Woodbridge
All is well that ends well. If it happens again when your AC runs for extended period, it will mean that blower motor is over heating. Not sure if your technician took measurement on amps drawn which reveals potential issues.

Easto wrote: Basically, I had someone come check it out.

He unplugged a couple wires and plugged them back it.

Wiggled a few things

Tested it and the blower fan came on.

He honestly didn’t know what he did to make it work.

So….. who knows
HVAC Pro-Committed to customer, not brand. Past RFD Reviews
2022 Central Air Conditioner & Furnace Group Buy
Deal Addict
Feb 25, 2007
2993 posts
725 upvotes
Easto wrote: Basically, I had someone come check it out.

He unplugged a couple wires and plugged them back it.

Wiggled a few things

Tested it and the blower fan came on.

He honestly didn’t know what he did to make it work.

So….. who knows
hope he honestly didn't know what to charge you also?
[OP]
Deal Addict
Aug 22, 2009
1712 posts
1237 upvotes
$120 something

I was trying to sleep on nights, so my wife dealt with it. But if it goes again I’m not too sure what I’ll do.

11 year old builder grade furnace. Not too sure how long this thing has left
Deal Addict
Jun 16, 2009
3685 posts
2165 upvotes
Woodbridge
That’s a very reasonable amount he charged you.
Not always a reason can be found even when super techs are involved. There are intermittent faults which are impossible sometimes to detect.
Don’t lose your sleep over such a minor issue.
Depending upon make and model besides the condition there should be enough life left in furnace.

Easto wrote: $120 something

I was trying to sleep on nights, so my wife dealt with it. But if it goes again I’m not too sure what I’ll do.

11 year old builder grade furnace. Not too sure how long this thing has left
HVAC Pro-Committed to customer, not brand. Past RFD Reviews
2022 Central Air Conditioner & Furnace Group Buy
Deal Fanatic
User avatar
Mar 5, 2006
6322 posts
578 upvotes
Murica
For us same thing happened and it turned out to be furnace fan transformer
[OP]
Deal Addict
Aug 22, 2009
1712 posts
1237 upvotes
The house was 27 degrees and trying to sleep for a night shift was brutal.

Was charged a service call, but it got it working so that’s a win.

The tech said if a repair costs $1,000 we are better off getting a new furnace.

It’s a Lennox G43UF
Deal Addict
Jun 1, 2010
1094 posts
321 upvotes
Easto wrote: $120 something

I was trying to sleep on nights, so my wife dealt with it. But if it goes again I’m not too sure what I’ll do.

11 year old builder grade furnace. Not too sure how long this thing has left
I would run the furnace till it stops heating. If its a minor fix it may be worth it to repair vs replace if its a failed heat exchanger or blower motor you may be best to replace especially if a builder grade quality. 10-14 years is the lifespan of a builder grade furnace from our experience.
Last edited by fourseasoncomfort on Sep 19th, 2021 8:54 pm, edited 1 time in total.
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Deal Addict
Jun 16, 2009
3685 posts
2165 upvotes
Woodbridge
If the blower motor is PSC motor, it can be replaced under 450 but if the motor is ECM then it is much more expensive to replace. An average ECM motor cost is 1200 $ VS new furnace with an average cost of 3600$. Many factors MUST BE considered before taking a decision either way.
Failed blower motor should not warrant replacing a furnace at least IMHO.
fourseasoncomfort wrote: I would run the furnace till it stops heating. If its a minor fix it may be worth it to repair vs replace if its a failed heat exchanger or blower motor you may be best to replace. 10-14 years is the lifespan of a builder grade furnace from our experience.
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Oct 2, 2018
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Toronto
Lucky you got an honest repair person, not all have been so fortunate.

Enjoy the AC for the next month then well be into turning the heat back on.
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Deal Addict
Oct 19, 2020
1048 posts
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GTA
Generic ecm motors are far cheaper than oem, but don't have universal compatibility.
Easto wrote: $120 something

I was trying to sleep on nights, so my wife dealt with it. But if it goes again I’m not too sure what I’ll do.

11 year old builder grade furnace. Not too sure how long this thing has left
Furnaces can last over 20 years, but no guarantees.
Just a question of how much money you want to spend on it. A matter is personal preference.
Before spending money on major repairs, visual heat exchanger inspection is essential and it can take a camera to inspect when a/c coil is installed right above.

Imo $500 and less repairs are worth it at this stage.
Above that, considering it is a more basic builder's style unit, need to really weigh replacement with repair.
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