Question about Heating & Cooling

1 Answer

Armstrong A/C it is not kicking on or cooling??

The unit is not working at all but looks like it has power.. when you push the contactor in it works.?? HELP

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 57 Answers

Does the indoor fan run in on? If yes then you have 24 volts on the control system.
Do you have a float switch on the Air Handler?
If your Air Handler is in your attic the secondary pan can be full tripping the float switch.
also If red is broke on the float switch nothing runs.
If the drain line plugs up the float switch shuts the condenser off to prevent flooding.

Posted on May 20, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a Arctic King through wall AC model MWW-12ERN1-MI0 and the compressor will not engage to cool the air. Can anyone help me diagnose and fix this problem?

On the ac unit electric section, check for power at Y1, should have power, possibly to x or c ( common terminal).
Check for power across the compressor contactor, should have power or something is open such as a pressure switch or compressor protection. If there is control power at compressor contactor solenoid ( 24 volts control), then check for supply power on line side of contactor, then on load side of contactor (supply voltage e. g. 230 volts. If all voltages are present, then check the compressor for opens and electric continuity.
CAUTION: electricity is dangerous, can kill and/ or cause fires. Do not attempt if not aware of safety procedures.

Aug 08, 2017 | Heating & Cooling

1 Answer

Need a wiring diagram for and armstrong SCU10A30A-3A AC unit specifically from the control board to the out side unit. not 24V to the contactors

Looks like all you have from inside unit to outside unit is the hot and common for the compressor contactor. What seems to be the problem?

Apr 12, 2017 | Heating & Cooling

1 Answer

Compressor want come on

Here is what to do . Pull out or turn off Electrical disconnect behind unit . Carefully remove panel covering controls in unit . Note most units have a flat panel with a few screws, but some GE units have a welded metal box on top of unit which needs to be removed. After exposing controls. replace or turn on disconnect. Then take a plastic handled screwdriver and push in on center of contactor (boxlike part with a lot of wires hooked ) If the compressor now comes on release contactor , and check for 24 Volts AC at base of contactor where thermostat (small wires that run on outside of black refrigerant line ) with thermostat on and calling for cool you should measure 24 to 28 volts . If voltage is present replace contactor after disconnecting from power. If no voltage go inside , remove cover from thermostat, and check for 24 volts between red ( R) and yellow (Y ) terminals on thermostat , If voltage is present , replace thermostat , no voltage check voltage in heater / air handler if you have voltage at air handler , replace thermostat wire from heater to thermostat / if no voltage check for blown fuse in heater , this should be either an inline fuse or an automotive type fuse plugged into circuit board (with power to heater disconnected check broken wire or black mark in fuse when held up to light. If fuse good turn on power to heater and check for 230v to one side of transformer, if you get voltage to Primary (incoming side ) of transformer, check output side of transformer for 24 - 28 volts. If transformer shows input but no output replace transformer after turning power off. If you heard a buzzing or grinding noise , when pushing in contactor , but compressor didn't start look at run capacitor (this is round or oval shaped object with wires going to contactor and compressor ) Looking at area where wires plug this should be a flat surface , if it looks domed shaped or bulging out , it is blown and needs replaced , use same mfd rating and 440 Volts to be on safe side. / If there was no noise from compressor when contactor was pushed in , put your hand on top of compressor (black object in center of unit ) If hot , allow to cool for at least three hours with power to unit turned off and retest . If compressor comes on after cooling , check for bad fan motor in outside unit (it may make a squealing or wining noise and stop runing for a while , also check for / clean outdoor coils
Hope this helps .

Oct 04, 2014 | Carrier Comfort 3.0 Ton 13 Seer Ac Only...

2 Answers

Ac not running

Your not very clear about your problem. You say it has "juice" but no power. Juice is power so exactly what are you saying? If you mean that there is power going to the unit but the unit is dead then you need to check if the thermostat and it's wiring are supplying power to the contactor (relay) If not then you could have a bad contactor or thermostat or an open in the wires that go from your theromostat to the transformer (which could also be bad) to the contactor itself. The contactor is what passes power to the unit when the theromostat demands cooling. If any part of that circuit is bad then the contactor will not close and even though there is power the unit will not work because the contactor points are left in their open position not able to pass the power onto the unit.

There is a simple test that you can do but you have to be very careful because your working with live wires. First make sure that the thermostat is set for cooling then go up to the unit and get an insulated tool like a screwdriver with a plastic handle and gently push the plastic part of the controller downward just for a few swconds. If the unit comes on then your problem is with the thermostat, or it's wiring, or the transformer or the contactor itself.

Good luck,


Jun 18, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

10 seer weatherking contactor switch stuck.have been using astick lol but serious had to wedge stick all summer to push in switch .now all of a suddon it stuck. asking why i ha to push in switch and why it...

The contactor is supposed to turn the condensing unit on when everything else is right and the thermostat calls for cooling. There are various sensors that can keep the contactor from activating. If you are low on freon, if the inside coil is iced over, if the freon pressure is too high or alternatively too low, if there is no air flow to the inside coils and when the thermostat says it is cool enough, the contactor will kick the unit off. The contactor works off of low voltage signals sent from various sensors. When all sensors say ok the contactor pulls in the 220 volts. Because you are pushing the button in manually, you are over-riding all the sensors. It is something you are not supposed to do. To determine the exact cause, you would need to follow the wiring diagram to each sensor to see which one is showing a fault. Manually holding the contactor in can cause severe damage to your unit, if it hasn't already done so. As to why it is stuck on, there is an electromagnetic coil that pulls the main contact points together. The contacts may have overheated and welded together, or the magnetic coil may have burned out and swelled up enough to prevent the rod mechanism to back out of the coil. I would strongly suggest you have a good AC technician trace out your system to find the fault.

Sep 13, 2010 | Weather King 10AJA3001AH Air Conditioner

3 Answers

I have an Armstrong Air Concept 1000 AC unit won't turn on

Neither of the above solutions are correct. You need to replace the capacitor 35/5 uhf 370 vac the cost should be $15 or less at a local HVAC retailer. Make sure you have the breakers off plus pull the contacts out which are inside the big box connected to your house. Make sure you pay attention to where the wires go. The red wire goes to common, the yellow to compressor (herm) brownish to the fan. The capacitor will be oval not round <!-- from fixya rte -->

Jul 10, 2010 | Heating & Cooling

2 Answers

AC not blowing cold air

Remove the outside fuse from the unit that is not cooling... remove all the sheet metal from around the outside unit.. see if there is a lot of grass/weeds/ bird nests, or other material in the coils.. if there is... use a high pressure hose to clean the coils completely!!!!! (I had this done to mine...worked much better!!)..if this doesn't help,, I am afraid it might be time for some freon... and yes..its $$$$...

Aug 11, 2017 | Amana Heating & Cooling

1 Answer

Out door unit on a armstrong heat pump will not come on unit # SHP10B30A-2A using the thermostat, unit will come on by pressing in on the contactor.

Have a look at the low volatage tranformer,should show 115 volts in and 24 volts out,when unit is calling for ac.There may be a small overload button on the side of the transformer,check that its pushed in.

You need low voltage to pull in the contactor.

Jun 06, 2010 | Heating & Cooling

1 Answer

I have an armstrong concept 10 a/c. the thermostat shows its cooling however it just runs the indoor blower motor, the outside unit does not come on even though i checked to make sure it is getting power...

Check float switch. Underneath unit or in front. Stopped up drain causes them to trip. Find outside drain and use a shop vac to **** out stoppage. You may have Tsta problem or a broke wire to outside. See if you can here your contactor energize. Its in the outside unit. You can here it when it energizes

Jun 10, 2009 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

195 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2900 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides