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A/c unit won't come on

The entire unit will not come on at all. The air compressor, fan, heat are not working. It does have power to it.

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Do you have a low voltage fuse in the Air Handler?
The fuse could have blown if there is a low voltage short in the system. The low voltage system powers the Thermostat.
If no fuse the transformer may be bad. Or the Thermostat may be bad. Or it could be a tripped float swith which means the drain line is plugged and overflowing the primary pan into the secondary pan. Nothing runs if the installer broke the red wire to the switch. It's always a good idea to keep the drain line clear. this can be done by finding the location to where it comes out on the outside of your house. use a wet and dry vac on the line or even back flush with a garden hose just make sure you use a very short count to 5 when flushing. You do not want to flood the primary pan you just want to cause a vaccume on the line with water.

Posted on May 17, 2008

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  • 149 Answers

If unit uses a manual switch to turn on suspect it faulty if a circuit board is used the main fuse blew out.

Posted on May 17, 2008

  • Alexander  Figueroa
    Alexander Figueroa May 17, 2008

    also try looking at the condition of the combination capacitor it can be faulty too

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22yooper
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SOURCE: my a/c unit will not come on

If you have a digital thermostat check the battery. After you change the battery switch the fan to the on position. The fan should come on. If it does not the transformer that supplies the voltage for the control circuit could be bad. Check the fuse at the air handler and the off/on switch also to make sure it is on at the air handler (Furnace).

Posted on May 17, 2008

co7196
  • 3433 Answers

SOURCE: Dometic AC that the fan shuts off but the compressor keeps running

call dometic dealer. I hear they have a bad circuit board that is replaced.

Posted on Jun 02, 2009

  • 3 Answers

SOURCE: split unit, I get heat but no cold

check for a signal on a demand for heating at the ondensor and thermosat

Posted on Oct 20, 2012

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1 Answer

Wiring diagram for dometic a/c model600312.331c


Assuming the fan has only one speed. Remove the two leads going to the fan and connect them directly to the incoming power to the entire unit on the switch side, that way soon as you turn on the unit the fan will also come on, but not go off until you shut down the unit. Just make sure the voltage required by the fan and the supply voltage to the unit is the same.

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My goodman unit (1994) makes the loud noise, like a buzzing noise. The unit works, the blower blows air into the house, the air is cold, but the outside fan that blows across the condenser piping isn'


you need to replace your condensing fan motor. the noise you are hearing is the compressor working against a lot of pressure because the heat is building up in you condensing unit. Prolonged operation without an operating condensing fan motor will cause your compressor to burn up, and then you will have the cost of a compressor changeout to the cost of a condensing fan motor.

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Indoor fan barely turning


the three post capacitor has c for line voltage in, the f or fan is for the outdoor motor,and com or comp goes to start winding compressor.youll have to follow wires from indoor motor to find capacitor. to find wires to outdoor motor to capacitor you have line voltage and capacitor wires .look for schematic it would help or send colors of wires from both motors and compressor common,start .run.

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1 Answer

Pro Standard Fan mount


Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.

Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.

Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade. MORE DETAILS

Nov 13, 2012 | Air Conditioners

1 Answer

My 4 year old Ruud home a/c compressor stopped working. inside fan blows but compressor won't turn on...what can I do prior to calling the gas company who installed the unit...


Ruud parts warranty from factory is 5 years, the capacitor has possible gone out, it will be in the contol compartment on the out side unit and is a dual run capacitor that controls the compressor and fan motor. Recommend if capacitor is bad to replace entire capacitor. As Stated above the parts are under warranty if under five years old. To verify age the date code is in the serial number after the "F" **** week/year of manufacture. Also outside unit has independent power supply so check fuses if any and circuit breaker.

Aug 21, 2011 | Ruud UBHC Air Conditioner

2 Answers

My down stairs unit is blowing out warm air. the fan outside is blowing cool air....


Hi,
Your unit is running in heat pump mode...hope you knew that you had a heat pump...
Anyway the problem would either be the thermostat or the reversing valve...
It will take some detective work to figure out exactly which is causing your problems...

heatman101

Aug 16, 2010 | Ruud UBHC Air Conditioner

1 Answer

Neither A/C compressor or fan coming on in ouside unit.


The bulge is a telltale sign of a defective capacitor along with the tripped breaker. Replace it and cross your fingers.

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1 Answer

A/c unit not working


So only fan is running, the compressor not running okay check the voltage going to the compressor. The connection is coming from Thermostat or temperature controller, if there is supply going to A/c Comp. check the safety thermostat relay above the compressor.

Jun 01, 2009 | Air Conditioners

3 Answers

Split unit, I get heat but no cold


I have run into this with the LG brand systems. try shutting power off to the outdoor unit to reset all units. If problem persists, it could have to do with a charge level of refrigerant (freon) or possibly a failed control board.

May 16, 2009 | Fujitsu 24R1 Air Conditioner

1 Answer

My a/c unit will not come on


If you have a digital thermostat check the battery. After you change the battery switch the fan to the on position. The fan should come on. If it does not the transformer that supplies the voltage for the control circuit could be bad. Check the fuse at the air handler and the off/on switch also to make sure it is on at the air handler (Furnace).

May 17, 2008 | Air Conditioners

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