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A-1 Tech
A-1 Tech, Service Manager
Category: HVAC
Satisfied Customers: 512
Experience:  I have been in the HVAC business for over 40 years.
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My outdoor AC unit wont turn on. Only the attic furnace slash

Customer Question

My outdoor AC unit won't turn on. Only the attic furnace slash fan is blowing.
Submitted: 2 years ago.
Category: HVAC
Expert:  A-1 Tech replied 2 years ago.

A-1 Tech :

Hello, my name is XXXXX XXXXX I will assist you today


 

A-1 Tech :

The first thing to do is check your breakers to the outside unit.


 

Customer:

they were never off, I flipped them off then back on.

A-1 Tech :

If the cooling coil is above a ceiling, you should have a safety drain pan that would be visible, it mounts under the cooling coil. This pan may have water in it and a float switch cuts the unit off.


 

Customer:

The outside unit is on the ground.

A-1 Tech :

the cooling coil should be by the indoor fan


 

Customer:

checking

A-1 Tech :

do you have gas or electric heat?


 

Customer:

the drain pan is dry, the heat is gas.

A-1 Tech :

okay


 

A-1 Tech :

we can take the cover off the outside unit and check the contactor if you would like


 

Customer:

It's a Trane XR13, is it the corner panel that has the tubing running in and out?

A-1 Tech :

yes, it should be just above the tubing. I will put picture up of a contactor for you


 

Customer:

ok

A-1 Tech :

Full Size Image


 

A-1 Tech :

note hte divider in the middle with a plastic piece on each side.


 

A-1 Tech :

these are the contacts, they are spring loaded, low volts to this contactor pulls these contacts down to turn the unit on.


 

A-1 Tech :

you may have only 1 contact points instead of 2, thats ok


 

A-1 Tech :

if they are not pulld down or in, with a screw driver you can push down on this piece of plastic.


 

A-1 Tech :

the unit should come on


 

A-1 Tech :

If they are already down, there is another electrical problem inside the unit.


 

A-1 Tech :

if they are already pulled down, there is another electrical problem inside the unit.


 

A-1 Tech :

Be careful, this is 230 volts


 

A-1 Tech :

please advise of what you find.


 

Customer:

i think they are down.

A-1 Tech :

you can push on them and it wont hurt anything if you need to.

A-1 Tech :
A-1 Tech :

Can you look around inside that compartment and see if any wires look burned?


 

A-1 Tech :

Also look at the capacitor, does it look burned or swollen?/


 

A-1 Tech :

Full Size Image


 

A-1 Tech :

capacitors


 

Customer:

everything looks good in the area, the arms are definitely down

A-1 Tech :

okay, nothing out there runs?


 

Customer:

nothing

A-1 Tech :

then I am thinking either the capacitor is bad or we don't have 220/230 volts to the unit.


 

A-1 Tech :

a capacitor can fail without swelling.


 

A-1 Tech :

would you happen to have a volt meter?


 

Customer:

no

A-1 Tech :

then please double check the breakers. It will be a double breaker. turn them hard to the off position and then turn back on


 

A-1 Tech :

It is probably a 30 or 40 amp breaker


 

Customer:

there is a small hum and vibration coming from the AC after flipping them, but its not turning on.

A-1 Tech :

that could be the compressor running without the motor coming on


 

A-1 Tech :

the contactor also has a slight humm sometimes also


 

A-1 Tech :

lets turn the breaker on and see if you can feel heat coming from the unit.


 

A-1 Tech, Service Manager
Category: HVAC
Satisfied Customers: 512
Experience: I have been in the HVAC business for over 40 years.
A-1 Tech and 4 other HVAC Specialists are ready to help you
Expert:  A-1 Tech replied 2 years ago.

If you need further assistance, please let me know, Ron

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A-1 Tech
A-1 Tech
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I have been in the HVAC business for over 40 years.