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rickcusaf 06-08-2010 01:42 PM

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.

beenthere 06-08-2010 02:00 PM

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

rickcusaf 06-08-2010 02:04 PM

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.

beenthere 06-08-2010 02:20 PM

Your main electrical box for the house, is where the breaker is, or fuse if its a fuse panel box..

rickcusaf 06-08-2010 02:24 PM

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.

beenthere 06-08-2010 02:28 PM

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.

rickcusaf 06-08-2010 02:31 PM

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.

beenthere 06-08-2010 02:36 PM

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.

rickcusaf 06-08-2010 02:50 PM

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.

beenthere 06-08-2010 04:59 PM


Originally Posted by rickcusaf (Post 453051)
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.

rickcusaf 06-08-2010 05:13 PM

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.

beenthere 06-08-2010 05:29 PM

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.

rickcusaf 06-08-2010 05:31 PM

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.

beenthere 06-08-2010 05:42 PM

And you checked to see if you had 240 on either side of it?

rickcusaf 06-08-2010 05:43 PM

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

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