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Billy I'm ***** ***** - my heat/Air unit is humming and no…

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Hi Billy I'm *****...

Hi Billy I'm ***** ***** - my heat/Air unit is humming and no air is coming thru the vent even though the fan is running out side. This is an inside unit...

Contractor's Assistant: Thanks. Can you give me any more details about your issue?

I'm not sure how to reset it and what other detail would you like.

Submitted: 2 years ago.Category: HVAC
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Answered in 28 minutes by:
1/23/2016
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,387
Experience: 20yrs in the HVAC industry with certificates and degrees.
Verified

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.

If the fan is running the A coil may be iced up can you check that?

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Customer reply replied 2 years ago
I live in Florida? where is the A coil at?
Customer reply replied 2 years ago
HVAC Guru Are you here?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

In the furnace plenum or airhandler it is the coil that coils and heats.....it may be iced over

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Customer reply replied 2 years ago
This unit is just humming, the fan is running out side and not air (hot or cold) is coming thru the vents.
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

OK well then the airhandler is not running, that could be a lot of things, can you get at the airhandler unit to see if any error codes are flashing on the board?

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Customer reply replied 2 years ago
Where can I find the airhandler unit (make believe am a novice).
Customer reply replied 2 years ago
The unit is humming again and the thermostat is off.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,024
Experience: Furnace, A/C and heat pump specialist.
Verified

Can you locate your indoor unit for me and tell me if it is a gas furnace or an electric air handler? If electric there should be a label on front listing model number.get me that number and we will go from there.

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Customer reply replied 2 years ago
Model # ***** Fan Coil Unit
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Excellent.Thanks for that information.Let me see if I have a manual so I can help with accurate information.I do not want to throw out a guess or just tell you it could be many things.I want to help you find the problem.

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Customer reply replied 2 years ago
Thank you... It's an electric unit.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

While I am looking for a manual. there should be 2 panels on front. One will be where the cooling coil is (you will see the copper lines ). The other,usually top is where blower is. Our first step is to open that top panel and turn thermostat to heat or coil and see if the indoor blower runs.Also see if there is any ice on the copper pipes or coil.

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Customer reply replied 2 years ago
No - the blower wheel is not turning and the unit is humming.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK. Next let me know if you have a multi meter for troubleshooting?

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Customer reply replied 2 years ago
Ok - let me get it.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am suspecting we either have a bad fan motor or a bad capacitor, but throwing out a guess without troubleshooting properly would be less than professional and not much of an expert.. With unit calling for heat or cool we want to check between FAN COM and FAN SPEED terminals on the air handler control board to see if motor is getting 230 volts.See drawing below

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Customer reply replied 2 years ago
Ok - I have the multi meter - can you help me follow your diagram.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Absolutely.Let me know if you see the control board and the terminals marked FAN COM and FAN SPEED. That is where we want to check for voltage.

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Customer reply replied 2 years ago
my husband says he sees both of them
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Remind him we are working with high voltage, then with thermostat calling for cool or heat check between those terminals by putting one lead on each and meter set to AC Voltage lowest scale above 240 (Probably will be 600V on meter)

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Customer reply replied 2 years ago
meter only takes 400v
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Excellent set to 400v and check for 230 to 240 between FAN COM and FAN SPEED

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Customer reply replied 2 years ago
Do I need to pull the wire out to test or should I stick the tester in the wires? Difficulty reaching... Also could it be the fuse?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

1. You can pull wires out of you want. Remember to turn power off first and when wires can not touch metal, turn back on and check between wires (not terminals on board).

2. Lets's check this first.Fuse is a possibility but not as likely since you have a hummimg.

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Customer reply replied 2 years ago
Ok - I change the fuse and it good. When I tested the wires I only got 2.8 reading.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

LOL. My bad. I told you to check wires, We need to check terminals since wires are unplugged.

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Customer reply replied 2 years ago
No - I'm not get 230v or anything close to it.
Customer reply replied 2 years ago
No - I'm not getting anything close to 230v
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

What are e getting? Also check from each of those terminals to ground on cabinet

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Customer reply replied 2 years ago
I thought we weren't going to touch any metal?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Do not let wires touch metal when they have voltage on them. We are going to put a meter lead to metal ground and a meter lead to each of the FAN SPEED and FAN COM to see what we have on each leg.

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Customer reply replied 2 years ago
Ok - this is with the power off - correct.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

No power on and calling for heat every time

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Customer reply replied 2 years ago
FANCOM = 194 COMSPEED=44.5
Customer reply replied 2 years ago
FAN COM= 194.3 FAN SPEED = 44.5
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Something mot jiving there. The two terminals receive power from the two legs of a 230v double pole breaker.Are you sure meter is set correctly and good batteries? We should not be getting more than about 125 volts max from one leg od the breaker.(One terminal)

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Customer reply replied 2 years ago
That is correct!
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If meter is set correctly and good batteries lets do same thing at the actual breaker that supplies voltage to air handler.(In main power panel)

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Customer reply replied 2 years ago
I did not put a multi meter on it , I put an electric tester on it and it was live. The bulb lit up.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am not understanding . Where did you get the 194 and 44.5?

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Customer reply replied 2 years ago
From the multi meter testing
Customer reply replied 2 years ago
The main box reads 244.2 (multi-meter reading)
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am still confused. You said you put the multi meter on those terminals and then you said you did not put a muli meter on it but used a meter with a bulb.Help me understand.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Excellent now at breaker the 244 is good. Lets go each leg to ground in panel

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Customer reply replied 2 years ago
I used the multi meter for all testing except when I first test the main box. When I first tested the main box I used a regular electric tester to find out if there was any juice in it. Then I used the multi meter and got a reading of 244.2
Customer reply replied 2 years ago
I got 120.5 and 122.4
Customer reply replied 2 years ago
coming from the unit. between them 257. each leg to ground 230 & 240
Customer reply replied 2 years ago
Turned on unit again still humming & clicking but the fan is not spinning
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Not making good sense on our power. If we have 120.5 from a leg of breaker to ground at breaker, We should have that same 120.5 at unit on that leg

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Customer reply replied 2 years ago
the power was fluctuating or jumping.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

We should have steady power pretty much, maybe fluxuating a few volts, but no way we should have 230v to ground from a breaker that is sending 120.5 to ground.Wondering if there is an issue with meter.

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Customer reply replied 2 years ago
I'm not getting enough juice from the electric tester to light the bulb. The area where I'm testing has the yellow com and three different com speeds (low, med and hi) the yellow is in the com and the black was in low - I'm I in the right area?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Get rid of the light tester. If will not work for what we are doing.We want to be at the very first lugs where power comes to furnace and using the meter right now. Can you send pictures showing what you are doing?

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Customer reply replied 2 years ago
Having hard time sending pictures
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If you have a paper clip icon on your page you can attach using that link.Or

You can upload the pictures using the tiny pic site .

Here is a link to the site.

http://tinypic.com/

Click on Browse , select the file from your folder.then click UPLOAD NOW.

They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW

You will see your picture on right side of screen.

Then copy the link URL for email & IM

Paste that link here on the site.

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Customer reply replied 2 years ago
My pictures are not down load correctly tonight - is there another way.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am about to have to leave so I am going to open this to other experts so you do not have to wait.

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Customer reply replied 2 years ago
Thank you and thank you for your help!
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3,972
Experience: Experienced in all aspects of HVAC, both residential and commercial.
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Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. If you are not satisfied, I'd appreciate it if you'd tell me why before leaving a negative rating and allow me to continue to work with you until we are able to both agree on an outcome to follow. Thanks for your business!

You say the indoor unit is "humming". Can you open up blower panel, find the blower wheel, and try to spin it with power off. Let me know what you find.

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Phil
Phil
Phil, Mechanical Engineer
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