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Old 06-08-2010, 02:42 PM   #1
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HVAC Outside Fan won't turn on


Contactor pulls in like it should, but the outside fan does not turn on at all.

I checked the voltage going from the box to the unit and it's reading 0v.

I should also add that during the replacement of the contactor the two 220v wires accidently touched when the duct tape I had holding them apart got humid and came up.

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Old 06-08-2010, 03:00 PM   #2
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HVAC Outside Fan won't turn on


Probably tripped the breaker in the panel box if you didn't have power turned off.

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Old 06-08-2010, 03:04 PM   #3
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HVAC Outside Fan won't turn on


You're correct. The power was on at the time and I heard a loud pop at which point I immediately turned off the power. Where do I find the breaker in the panel box? When I lift up the lid all I see are four wires. Two coming into the box from the house and two coming from the box to the outside unit.
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Old 06-08-2010, 03:20 PM   #4
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HVAC Outside Fan won't turn on


Your main electrical box for the house, is where the breaker is, or fuse if its a fuse panel box..
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Old 06-08-2010, 03:24 PM   #5
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HVAC Outside Fan won't turn on


There wasn't one labeled for the hosue so I reset them all. No power to outside unit still other than low voltage to the contactor.
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Old 06-08-2010, 03:28 PM   #6
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HVAC Outside Fan won't turn on


Trace the wire from the condenser back to the panel box. Check for voltage at any junctions. Make have damaged the breaker that it doesn't reset.
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Old 06-08-2010, 03:31 PM   #7
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HVAC Outside Fan won't turn on


I'm reading 26v at the low-voltage terminals, but nothing on the 220v wires. I may be measuing the voltage at the wrong spot. I was under the impression that if I had no power coming to the outside unit then the contactor wouldn't pull in either, but I the contactor closes just fine.
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Old 06-08-2010, 03:36 PM   #8
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HVAC Outside Fan won't turn on


The contactor gets its power to close from the furnace*the yellow and brown wires on the contactor) hence the reason the furnace needs a transformer.

However, the compressor and the condenser fan need 240 volt to run. And that is the electric you appear not to have.
You'll need to trace the wires back to the panel box. And if you find any junctions, check that they are ok.

The area you turned the power off at when you heard the pop. Does it have votlage coming to it.
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Old 06-08-2010, 03:50 PM   #9
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HVAC Outside Fan won't turn on


I have no voltage coming from the house to the power box of my outside unit. I also don't have anything listed on my circuit breaker that says it goes to my outside unit. Where else would the wire lead?

Is there any chance it leads directly to my meter outside?

I did some checking in my attic and found the line that leads to my breaker box. There are no junctions in between the two. Just one solid line.

Maybe I'm measuring the voltage in the wrong spot. Where should I place the probes to check the voltage coming to the contactor? I even took the panel off the breaker box to see if anything looked out of place or burnt and everything looked ok.
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Old 06-08-2010, 05:59 PM   #10
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HVAC Outside Fan won't turn on


Quote:
Originally Posted by rickcusaf View Post
Is there any chance it leads directly to my meter outside?
NO. Connecting directly to your meter would be a major code violation.

You would set your meter to 240 or 300 or what ever your high voltage setting is on that meter. And read both of the hot feeds at the same time. Then do the same to the breaker in the panel box.
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Old 06-08-2010, 06:13 PM   #11
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HVAC Outside Fan won't turn on


I checked outside and measuring that way still shows 0v.

When I take the panel off the breaker box where should I stick the probes? I don't want to shock myself.
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Old 06-08-2010, 06:29 PM   #12
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HVAC Outside Fan won't turn on


On the terminals of the breakers.

Trace the wire back to the panel box, so you know which breaker it is.

Does your outside disconnect have fuses in it? If so, did you check them.


At this point. You may want to consider calling either an HVAC service tech, or an electrician to check out your electrical problem, if you aren't comfortable inside a panel box.

Working inside a hot panel box. has a risk of getting shocked. And there is a possibility of a more then just a little pain from it.
Death can occur.
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Old 06-08-2010, 06:31 PM   #13
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HVAC Outside Fan won't turn on


I'll have to check each one individually, because the way my wires are setup it's impossible for me to tell which one on the circuit breaker goes to my outside unit.

There are no fuses just a lever that goes from On to Off.
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Old 06-08-2010, 06:42 PM   #14
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HVAC Outside Fan won't turn on


And you checked to see if you had 240 on either side of it?
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Old 06-08-2010, 06:43 PM   #15
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HVAC Outside Fan won't turn on


I just checked each terminal on my circuit breaker and all of them are reading 119.6-120.5v.

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