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My a/c unit will not come on

The entire a/c unit will not come on at all. The air compressor, fan, heat none of it will come on. It is getting power to it. What could be the problem? It mearly just stopped working with no obvious reason.

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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

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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.

Aug 20, 2014 | Dometic Rooftop RV Air Conditioner

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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 | Heating & Cooling

2 Answers

Outside surface gets hot to touch


The most likely problem is a dirty or clogged up condenser grill (under your unit). When the condenser grill is dirty it can get rid of the system heat build up, so it transfers the heat to the cabinet.

Remove the front grill and vacuum it the best you can, a small brush would help loosen up the dirt. Then move the unit away from the wall and remove the rear panel and use an air compressor to blow it out.

Make sure that the condenser fan is operating or that could also be the problem.

If none of this remedies the problem then your unit could need to be charged with freon. Because if the freon is low the compressor has to work harder to cool.

Aug 07, 2011 | Kenmore Top Freezer Refrigerator

1 Answer

I have air energy 2 heat pump there is power from 30 amp breaker to 30 amp disconnect to panel on pump. When compressor kicks on 30 amp breaker blows. ????


Does compressor run at all? If not, could be shorted or grounded. Might aslo check connections to compressor. Make sure none are worn and making contact with any metal on unit.

Jul 26, 2011 | Jandy Air Energy Heat Pump - 100,000 Btus

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I have a Rheem heat pump/air handler; it draws 2.9amps with only the fan running, 13amps when the heat pump is running and 38amps with the heat strips on. My question is why the unit draws that many amps...


Sounds like it must be about a 2.5- 3 ton system. The 13amps has to be the compressor draw -normal. and 38 on the strips- normal. 2.9 fan -normal.

You may want to check your wiring to see where the outside unit gets its power. Theres nothing inside that can draw 13 amps. That almost has to be the compressor power wire.

Jan 27, 2011 | Heating & Cooling

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My Rheem Air conditioning unit is not cooling.


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Hi,

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool…

Air Conditioner Trouble - Review the Possibilities

heatman101

Sep 03, 2010 | Heating & Cooling

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.

Jun 21, 2010 | Carrier 38CKC036 Air Conditioner

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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

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High Pressure cutoff


YOUR OUTDOOR FAN MOTOR SHOULD NEVER SHUT OFF IN THE AC MODE. IT IS SUPPOSED TO SHUT OFF IN THE HEAT MODE WHEN ITS IN DEFROST. IF THE UNIT IS RUNNING IN COOL AND THE OUTSIDE MOTOR QUITS ,THE COMPRESSOR WILL QUIT SOON AFTER. EITHER THE RUN CAPACITOR FOR THE FAN IS BAD OR THE FAN MOTOR ITSELF IS BAD, IF CAP IS GOOD THEN THE MOTOR IS At FAULT. THE OUTDOOR PRESSURE SWITCH CAN ALSO OPEN IF THE INDOOR FAN MOTOR FAILS IN HEAT OR THE FILTER IS PLUM NASTY in heat OR THE INDOOR COIL IS PLUGGED UP in heat.. THE PRESSURE SWITCH USUALLY TRIPS AT 400 TO 425 SO ITS WORKING CORRECTLY. YOU MAY BE CONFUSING THE ISSUE SAYING THAT THE AIR IS HOT AND COLD INSIDE. IT IS COLD WHEN AC IS RUNNING HOT WHEN HEAT PUMP IS RUNNING IN HEAT BUT ESSENTIALLY not cold or hot if compressor isn't running, but a lot of folks describe the lack of cold air as hot when the compressor isnt running. but it basically is warm or house air temp.you test the capacitor with a capacitor tester or take it to motor shop and let them test it. odds are its a 5 , 7.5 or a 10. it should test within 10 % of rated value . ask for a RESCUE brand replacement motor. they are great ,reversable etc.carefully oil and sand the motor shaft and note exactly where the blade was located in relation to the grill so you get it back just the same. usually they wire up black to a leg of 220 power. white to the other leg of 220 power. brown and brown with white stripe to the capacitor.you can also pull whole fan shroud assembly on some units and take whole thing to motor shop and let them test motor cap, replace and all you do is return to unit and connect two power leads,

Oct 26, 2008 | Heating & Cooling

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