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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: 8 months ago.
Category: HVAC
Expert:  WCohn replied 8 months ago.

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

Expert:  WCohn replied 8 months ago.

What is it NOT doing?

Customer: replied 8 months ago.
The inside fan does not run as well as the outside.
Expert:  WCohn replied 8 months ago.

Okay, I assume the filters are clean?

Customer: replied 8 months ago.
sir
Expert:  WCohn replied 8 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 8 months ago.
After I replaced the capacitor, is there some kind of reset
Customer: replied 8 months ago.
Nothing at all
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
no air flow
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
Outside
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
Basement
Expert:  WCohn replied 8 months ago.

Okay is it also your furnace?

Customer: replied 8 months ago.
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
but not at the moment it is powered off
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
The air handler does not come on at all
Expert:  WCohn replied 8 months ago.

Okay is your furnace electric?

Customer: replied 8 months ago.
it is
Expert:  WCohn replied 8 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 8 months ago.
The one at the furnace is the type that u pull out. Yes they are both good
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
It will be a minute I need to take the cover off
Expert:  WCohn replied 8 months ago.

Do you have a multimeter?

Customer: replied 8 months ago.
I tried it several times it is making a humming sound
Customer: replied 8 months ago.
I have a multimeter
Expert:  WCohn replied 8 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 8 months ago.

Did the fan spin at all?

Customer: replied 8 months ago.
it spins
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
Nothing. It is still humming
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
OK I will start with the capacitor
Expert:  WCohn replied 8 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 8 months ago.
No I thank you
Expert:  WCohn replied 8 months ago.

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

Customer: replied 8 months ago.
If u can keep it open would be great. Is this capacitor hard to find
Expert:  WCohn replied 8 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 8 months ago.

I can still leave it open even after the rating

Customer: replied 8 months ago.
I'm talking about in the furnace
Expert:  WCohn replied 8 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 8 months ago.
Thanks
Expert:  WCohn replied 8 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 8 months ago.

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

Expert:  WCohn replied 8 months ago.

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

Expert:  WCohn replied 8 months ago.

how'd it work out for you?