Need help with AC unit wont turn on
Posted 17 May 2006 - 09:50 AM
Posted 17 May 2006 - 07:35 PM
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 !!
Posted 19 May 2006 - 09:12 AM
Posted 19 May 2006 - 06:20 PM
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!
Posted 20 May 2006 - 11:07 AM
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
Posted 20 May 2006 - 03:00 PM
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 ??
Posted 22 May 2006 - 10:04 AM
Posted 23 May 2006 - 12:56 PM
Posted 23 May 2006 - 01:06 PM
-old Irish saying
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Posted 23 May 2006 - 01:47 PM
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.
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