Jump to content


Use this Search Box to Find Appliance Repair Help Now
Need help finding your model number?
365-day return policy on all parts purchased here, even electrical parts that have been installed!


FAQs | Store | Memberships | Repair Videos | Newsletter | Beer Fund | Contact


Welcome to Appliantology.org, the Web's Premiere Appliance Repair Resource for DIYers!

The world-famous Samurai Appliance Repair Forums


You can post a question and get repair help for FREE! Click here to get started.


Already a member of the Appliantology Academy? Just sign in with your username and password in the upper right-hand corner of the screen.

 


Photo

Need help with AC unit wont turn on


  • Please log in to reply
10 replies to this topic

#1 sonik

sonik

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 17 May 2006 - 09:50 AM

After buying our house i noticed that a dog had chewed up some wires going to the outside AC unit (two wires, very thin) and when using some spare wires i had to hook them up the ac unit would click as if turning on and after flipping the huge fuse on the outside wall next to it the ac would work.  If the outside fuse is off it still clicks when the wires are touched (if AC is turned on from inside).  I soldered the wires together and now for some reason it wont turn on.  I made sure thermostat was set to cool and it was set very low to make sure it should turn it on but no go.  I checked the fuse outside and it seems to be ok, its just a huge plug in fuse.  Since there is no click im assuming whatever is sending power via those two wires is not sending a signal or whatever was clicking before is now broken?  please help im not too good with ac units

Use the Appliantology Parts Search Box to Find What You Need!
Enter your model number, part number, type of appliance, brand, or even a part description.
365-day return policy on all parts purchased here, even electrical parts that have been installed!

#2 Northern-Tech

Northern-Tech

    Yamabushi

  • Master Appliantologist
  • PipPip
  • 82 posts

Posted 17 May 2006 - 07:35 PM

You have to verify wiring between AC unit and thermostat. Im assuming these are the small thermostat leads.

Turn off power.    Find out where the 2 leads connect up, or terminate in AC unit.

Remove these wires ( make a note pls ), and install small jumper wire. Turn on power. Did unit start ?? If so, problem is wiring between AC unit and thermostat, or thermostat itself.

To verify this........shut off power, and put wires back where they were. Go to thermostat, and remove cover. Jumper between 2 leads in back plate. Turn on power. If unit starts, the problem is the thermostat..............if not, then the wiring is defective between thermostat and Ac unit.            Good Luck !!


#3 sonik

sonik

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 19 May 2006 - 09:12 AM

thanks for the info.. im not the best at this stuff but i can usually figure things out. yes they are two small copper wires and i had it working fine when i just connected the wires up but as soon as i soldered the wires on it stopped working, i definately agree its from the ac unit to the thermostat on these two wires but when turning the ac unit to cold and turning thermostat down no power is going on these two wires i check it, can you pleaes be more descriptive on checking the thermostat is this on the back of the termperature control panel in my house, what am i looking for.  I apreciate your help

#4 Northern-Tech

Northern-Tech

    Yamabushi

  • Master Appliantologist
  • PipPip
  • 82 posts

Posted 19 May 2006 - 06:20 PM

Hey Sonik,

   Glad to assist. On the thermostat in the house, there is only the cooling mode...right ?? Im assuming its not a heat pump, but for cooling only. You should be able to remove the cover....it might be round, or square shape....low voltage thermostat. The cover should pry off easily enough. Then there should be a couple screws holding the thermostat onto the backplate. Remove these screws, and the thermostat should come off. Then you will see where the wires connect up.

You can either jumper the wires, or take the 2 wires off and twist them together. ).( This simulates the call for cold, and should start the system. Also  give it a couple minutes to act, in case there is a time delay in starting up . If it does not start the system, chances are the t- stat is ok, and you have a wiring problem.....which it sounds like to me. Maybe check the connections that you made soldering. Sometimes these fine wires can come apart, if the solder joint is not good, especially when taping them up. Good Luck!


#5 sonik

sonik

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 20 May 2006 - 11:07 AM

ok thanks, like i said it worked until i soldered the wires so maybe youre right as of now its like this for the wires

 

AC============================Control panel

 

the cpanel controls heat and the AC and has a Off, Heat, Cool setting so what i want to do is at the cpanel or even at the ac unit just touch the wires together?  I checked for voltage on them both and theres nothing at the ac unit


#6 Northern-Tech

Northern-Tech

    Yamabushi

  • Master Appliantologist
  • PipPip
  • 82 posts

Posted 20 May 2006 - 03:00 PM

  So your control panel has a heat function as well ? Is it also a heat pump, or just an AC unit ? I would think since it only has 2 wires , that possibly that controller may be a standard style that they used, and only the cool works??  ( Some of the newer thermostats have 2 wires for heat and cool, but use a battery for power, but I have not used any of these to date ).

Just want to make sure you are not using a " solenoid " type of meter,( it has a bar which moves in the meter, which snaps up and down when measuring voltage ) which will only trigger at about 70 volts ac / dc. Just want to make sure that we have the proper meter. Control voltage on t- stat should be 24 v   ac.

Lets start at the beginning. Shut off power. Pull fuse ( s ) and check for continuity with a multi meter on ohms. ( Touch the leads together first to see if the meter works fine...........just to be sure ) . If ok, put fuse back in, turn on power.

Let see how we make out with this, before going on.

Is there a pic of the wiring schematic  you could post ??

 

 


#7 sonik

sonik

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 22 May 2006 - 10:04 AM

sure was hot this weekend..  i took off the control panel and there are 4 wires but i can see the red wire and white wire which lead to my AC unit so these are the ones that control the ac.  I actually bought a new control panel and hooked it all up and still no go.  I almost think that one of the wires between control panel and the ac unit has been broken or something its just too weird.  I was gonna run two wires from the pins on the back of the control panel right out the window down to the AC unit to see if it would work that way but i didnt have any long enough.

#8 Dan Webster

Dan Webster

    Paw Paw

  • Academy Fellow
  • PipPipPipPipPip
  • 1,320 posts
  • Location: USA
  • Flavorite Brew:Busch

Posted 23 May 2006 - 12:54 PM

you should be getting at last 24 volts ac to them 2 small wires going to the contactor what 2 wires did you solder together?

"May the hinges of our friendship never grow rusty"
-old Irish saying

Buy me a Beer: http://web.me.com/ze...man18007260692/


#9 sonik

sonik

    Samanera

  • Grasshoppah
  • Pip
  • 5 posts

Posted 23 May 2006 - 12:56 PM

at all times? I measured them and theres nothing..put in a new thermostat and nothing.. whats the coil looking thing mounted on the air conditioner? i soldered the two wires from the ac unit to the wires coming from the thermostat. 

#10 Dan Webster

Dan Webster

    Paw Paw

  • Academy Fellow
  • PipPipPipPipPip
  • 1,320 posts
  • Location: USA
  • Flavorite Brew:Busch

Posted 23 May 2006 - 01:06 PM

the contactor is a small black bx with large wires going in and out of it this controled by those 2 small wres when you turn on the wall stat the two little wire power up the coil in this box called a contactor this snatches down the contacts and makes the fan and compressor come on . if you are a brave man you can take an insulated screwdriver and mash down on this contactor and see if the unit will fire up. be caredul though because its dangerous you could be electrocuted . If its a 2 pole open contactor you can usually push down on the top of it and see if the ac unit will fire off just for testing purposes but be careful you dont get shocked:yikes:

"May the hinges of our friendship never grow rusty"
-old Irish saying

Buy me a Beer: http://web.me.com/ze...man18007260692/


#11 Northern-Tech

Northern-Tech

    Yamabushi

  • Master Appliantologist
  • PipPip
  • 82 posts

Posted 23 May 2006 - 01:47 PM

1 - is your meter capable of measuring 24 volts ac? Dont mean to sound repetitive, but we have to ensure this.

2 - You should have 24 volts on the 2 wires, providing the thermostat is open. Once it is closed, you would have nothing since you are powering up both lines, so to speak.

3 - Like appliance man suggested, power the unit down, and see if the contactor will push in manually. It should spring back out, when you let it go. The front part of the contactor should move in, and out.

4 - Do as I suggested earlier on, and see if twisting the 2 wires ( red & white ) will start the unit. I would not start buying parts at this stage of the game. You may not be able to return them if they are not the problem. As well, finding and sourcing out the problem is a learned skill......which is what we are doing. Keep us posted.:)

 





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users


FAQs | Store | Memberships | Repair Videos | Newsletter | Beer Fund | Contact


Use the Appliantology Parts Finder to Get What You Need!
Enter a model number, part number, type of appliance, brand, or even a part description.
365-day return policy on all parts purchased here, even electrical parts that have been installed!

Your Sometimes-Lucid Host:
Samurai Appliance Repair Man
"If I can't help you fix your appliance and make you 100% satisfied, I will come to your home and slice open my belly,
spilling my steaming entrails onto your floor."

The Appliance Guru | AppliancePartsResource.com | Samurai's Blog

Real Time Analytics