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A/c problem Unit won't come on in cooling mode..It comes on when you press the contactor....

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Re: a/c problem


Posted on Jan 09, 2008

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Re: a/c problem

Check down by the back of the unit where your electric and copper lines come in for a little red reset button. Push it, the unit may then start.

Posted on Dec 09, 2007

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2014 Dometic Brisk II 15,000 unit won't cool below 88 degrees

Check the unit to see if the outdoor fan and compressor are coming on. If not, check to see if power is reaching the contactor, both the high power contacts and the low voltage solenoid. Some contactors can be manually actuated, and a quick press (with a NON CONDUCTIVE ITEM) can show you if the contactor is engaging. If the solenoid is not working, check the wiring of your thermostat. When set to cool mode, there should be voltage on the solenoid of the primary contactor, sending power to the outdoor fan motor and compressor.

If the outdoor fan and compressor engage normally, then make certain the coils are free of debris and other blockages. If air flows freely and the compressor is running, feel the tubing for temperature changes. One side should grow cooler and the other warmer.

If the compressor runs but there is no temperature change, take your unit to a certified technician to check for leaks and system pressures. Roof top units typically use R22 refrigerant not R134a automotive refrigerant, which require EPA certification for purchase and dispensing.

Jun 25, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Indoor unit powers up indoor fan runs, has call for cooling outdoor unit will not run, has coms issue

Good. When it calls for cooling the wire conncets to a contactor in the outdoor.
Unscres the center of contactor and then check the contactor by pressing thr' ur screw driver maually. Just only for 5 seconds.
If it works, the contactor coil is defective.replace contactor

Feb 03, 2014 | Midea Air Conditioners

1 Answer

Outside AC unit not coming on but indoor fan is working, replaced the start/run 5/50 capacitor but still didnt fix it, let it set allday while came home tried it and it came on and worked great, but the...

Sounds like you are on the right track. The symptom of the contactor not pulling is your clue to the solution. When you turn the thermostat down lower than the room temperature and the thermostat calls for cooling, the outside unit should start immediately. There are a few exceptions to this but generally this is correct. So if you turn the system to cool and the thermostat is calling for cool then the contactor should pull in immediately. If it does not then check for 24 volts to the contactor. If you have 24 volts to the contactor then the contactor is the problem. If you do not have 24 volt power to the contactor coil then you will have to find where the break in voltage to the contactor is happening.
There are many reasons why you may not be getting 24 volts to the contactor, so check what i stated above before you go any further. Repost if this is the solution or you need further assistance.
Important tip....the yellow wire from the thermostat carries the 24 volt power from the thermostat to the contactor.

Sep 08, 2011 | Intertherm P3RA-036K Air Conditioner

2 Answers

Outside fan on heatpump not spinning

Are you cooling or heating? In the cooling mode the fan should run with the compressor. Shutdown, open up control section of unit, check Capacitor. Try to turn fan blades by hand. Does it spin freely? Do not touch capacitor terminals until you discharge it by shorting terminals to ground. If the capacitor looks swollen then it is bad.

Aug 08, 2011 | Air Conditioners

1 Answer

Outside unit won;t come on blower on furnace inside works central air unit is 5 yrs old

First check the disconnect/circuit breaker for the outside unit. Then set the thermostat to make the unit come on. Remove the cover on the outside unit where the power goes in so that you can see the contactor. Is the contactor pulled in? If it is, check for proper voltage on the load side of the contactor. If thats good then look at the capacitor. If it looks swollen then it is bad otherwise you can check it with a multimeter or have a heating and air supply check it for you. If the contactor isn't pulled in, remove the face of the thermostat and install a jumper between the R and Y terminals. If the contactor pulls in then, the thermostat is bad. Let me know what you find so I can give you more advice if this doesn't get you going.

Sep 12, 2010 | Goodman Air Conditioners

1 Answer

Goodman AC Unit with Heat Pump - Works great cooling when switched to heat the outside unit does not come on - inside comes on and uses emergency heat? What can I check? I first checked the contactor and...

Because the outdoor unit works in cooling, it sounds as though the contactor and other components outside are working correctly. The problem sounds as though it might be somewhere in your thermostat. Has the thermostat been replaced recently? If so, make sure it was wired correctly. If not, check all of the connections and contact points in your thermostat. In order for your outdoor unit to run, you must have 24vac at your "C" Common and "Y" connections. You must have this in COOL mode. Now it has to be determined why you don't have it in HEAT mode. Definitely a thermostat issue.

Hope this helps and good luck! :-)

Mar 05, 2010 | Goodman CKL60AR60 Air Conditioner

2 Answers

Duo therm roof air is stuck in the heat pump mode, it won,t cool

The control circuit board that controls the contactor for that unit is proboly damaged
If it is a heat pump. And not electric heat

Or the Yellow wire from the thermostat going to the unit that wont work in thecooling mode is broken,burned,or loose

May 26, 2009 | Air Conditioners

2 Answers

Ruud heat pump

Did you just install this heat pump? If so it sounds like you replace a regular a/c with a heat pump, which will require more wires for the reversing valve. First check to make sure you have 24v going to the condenser. Make sure you have a heat pump t-stat. You should have a orange t-stat wire for your reversing valve. At the t-stat you will have terminals R, Y, G, O, X or C or B, W1, and W2. R is half of your 24v circuit and is a red wire, Y is for cooling mode, G is the Fan green wire, O is for the reversing valve, orange wire, X or C or B is the other half of control circuit blue wire, W1 and W2 is the heat strips in the furnace tan and black wires. These are standard color code but remember electricity does not know colors and an installer may have used different colors. If all of this is correct possibly bad contactor.

Oct 30, 2008 | Ruud UAMB Air Conditioner

1 Answer

Ruud heat pump outside unit trips circuit breaker

Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.

Nov 20, 2007 | Ruud Central System Air Conditioner

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