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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a XL 16si Unit that all of a sudden quit so a friend

Customer Question

I have a XL 16si Unit that all of a sudden quit so a friend of mine checked the capacitor with a multimeter and said it was bad. I replaced it and that did not fix it.
Submitted: 10 months ago.
Category: HVAC
Expert:  WCohn replied 10 months ago.

Hello, my name is ***** ***** I look forward to helping you!

Expert:  WCohn replied 10 months ago.

What is it NOT doing?

Customer: replied 10 months ago.
The inside fan does not run as well as the outside.
Expert:  WCohn replied 10 months ago.

Okay, I assume the filters are clean?

Customer: replied 10 months ago.
sir
Expert:  WCohn replied 10 months ago.

Lets be clear. The outside fan is not what blows air through your ducts. That being said are you feeling less air through the vents than usual?

Customer: replied 10 months ago.
After I replaced the capacitor, is there some kind of reset
Customer: replied 10 months ago.
Nothing at all
Expert:  WCohn replied 10 months ago.

No, the capacitor just helps the fan to get going. So you are getting ZERO airflow through the vents?

Customer: replied 10 months ago.
no air flow
Expert:  WCohn replied 10 months ago.

Where did you replace the capacitor? Indoor unit or outdoor?

Customer: replied 10 months ago.
Outside
Expert:  WCohn replied 10 months ago.

Well that only helps the outdoor fan, which isn't the issue. Is your indoor unit in the garage.

Customer: replied 10 months ago.
Basement
Expert:  WCohn replied 10 months ago.

Okay is it also your furnace?

Customer: replied 10 months ago.
Expert:  WCohn replied 10 months ago.

Does your thermostat call for a/c by saying "cool" on display?

Customer: replied 10 months ago.
but not at the moment it is powered off
Expert:  WCohn replied 10 months ago.

Okay make it call for "cool" then go into the basement and see iff fan is blowing at all.

Customer: replied 10 months ago.
The air handler does not come on at all
Expert:  WCohn replied 10 months ago.

Okay is your furnace electric?

Customer: replied 10 months ago.
it is
Expert:  WCohn replied 10 months ago.

Sorry for the delay, you should have two breakers for the furnace one at the furnace and one at the breaker panel. Check them both.

Customer: replied 10 months ago.
The one at the furnace is the type that u pull out. Yes they are both good
Expert:  WCohn replied 10 months ago.

Can you spin the squirrel cage style fan in the air handler? Spin it hard!

Customer: replied 10 months ago.
It will be a minute I need to take the cover off
Expert:  WCohn replied 10 months ago.

Do you have a multimeter?

Customer: replied 10 months ago.
I tried it several times it is making a humming sound
Customer: replied 10 months ago.
I have a multimeter
Expert:  WCohn replied 10 months ago.

Okay then I think you have a bad start capacitor on that fan motor. The humming is because its not getting enough of a boost. It could be a bad fan motor, but I'd start with the capacitor. They are much cheaper.

Expert:  WCohn replied 10 months ago.

Did the fan spin at all?

Customer: replied 10 months ago.
it spins
Expert:  WCohn replied 10 months ago.

Put the cover back on and see if it'll work now.

Customer: replied 10 months ago.
Nothing. It is still humming
Expert:  WCohn replied 10 months ago.

Well, its got power. If it isn't moving its the motor or the start capacitor.

Customer: replied 10 months ago.
OK I will start with the capacitor
Expert:  WCohn replied 10 months ago.

If the windings in the motor were bad it would trip the breaker, so I'd lean towards the capacitor.

Any other questions?

Customer: replied 10 months ago.
No I thank you
Expert:  WCohn replied 10 months ago.

Are you satisfied with my service? Or shall I keep this question open?

Customer: replied 10 months ago.
If u can keep it open would be great. Is this capacitor hard to find
Expert:  WCohn replied 10 months ago.

Take it to the local hvac supply like a Johnstone supply. They should have one. Let me know when you are willing to rate me and I'll activate it. It is the only way I get credit for my time.

Expert:  WCohn replied 10 months ago.

I can still leave it open even after the rating

Customer: replied 10 months ago.
I'm talking about in the furnace
Expert:  WCohn replied 10 months ago.

Follow the wires from the fan motor to the capacitor. Some motors have them on the motor themselves. I'll load a picture of each

Customer: replied 10 months ago.
Thanks
Expert:  WCohn replied 10 months ago.

Here it is on the motor under the case indicated by the arrow. (not common in fan motors but do exist)

Expert:  WCohn replied 10 months ago.

here's the more common style. He's pointing at the capacitor

Expert:  WCohn replied 10 months ago.

I've got to head to bed. Good Luck!

Expert:  WCohn replied 10 months ago.

how'd it work out for you?