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Ruud A/C condensor unit won't come on

The Condensor unit won't come on except if you push down the contactor manually. Over the winter the inside heater and air handling part of the split system was replaced with a Goodman unit. The outside part of the split system was not touched. It worked well last year. Any ideas?

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It sounds to me that the wire going to y2 on the furnance coming from the thermostat was not wired back up this is the wire that supplies control voltage to the contactor on the condensing unit. I would call the installer who changed the furnace out back to remedy this problem.

Posted on Jun 02, 2008

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1 Answer

Wiring diagram RUUD UAPA-036JAZ


the condensor gets 240 volts a-c and 24 volts a-c to control contactor. pretty straight forward on this 3 ton unit. the 240 volts comes off breaker box and the 24 volts comes off thermostat and common of transformer.

Jun 10, 2014 | Ruud Heating & Cooling

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I have a Ruud gas furnace. We just replaced the transformer and the capacitor in our ac unit. The heater now works but the ac does not. The compressor doesn't turn on at all. Everything worked last...


Go to your outdoor coil (condensor) and remove the cover where the electrical cord goes into the unit. You will see a cont actor with two smaller wires and at least two larger wires. Take an INSULATED screwdriver and push in on the contactor. Does the AC start when you do this? If so you have a 24VAC control circuit problem. Your T-stat closes that contactor when you call for "cool". Let me know what you find.

Aug 03, 2011 | Ruud Heating & Cooling

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Ruud heat pump wont kick off


If you have your thermostst in the off position and the outdoor unit is still running, your condensor contactor has welded shut.

Oct 30, 2010 | Ruud Central System Air Conditioner

1 Answer

I am trying to find a parts list for a RUUD UAKA-030JAZ air conditioning unit (specifically the compressor/condensor contactor).


RUUD will only sell there factory parts to certified contractors. My advice to you is to find a local HVAC parts distibutor that will sell you generaric parts which will work just as good as the factory parts.

Jun 23, 2010 | Ruud UAKA030 Air Conditioner

1 Answer

Fan works but condenser does not kick on


You air handler and condensor run off of two seperate circuit breakers. They share the same control voltage source. With the air handler responding to the thermostat setting, we know you have control voltage. You either have a problem with the line voltage at your condensor or something is happening in the control. Check your circuit breakers and/or fuses to your outdoor unit. Also, look for a red button near the area where the refrigeration pipes enter your condensing unit. Push the red button. If it starts to run, your unit went out on High Head Pressure. A dirty air filter this time of year can cause head pressure problems in the heat cycle (assuming this is a heat pump). Also check for cleanliness of the condensor coil and ensure proper operation of the outdoor fan motor.
There are a couple of components inside the condensor that could prevent it from running. One is the contactor. If the contacts are pitted or if a bug crawled in between them, it will prevent the unit from running. Another component is the Dual Run Capacitor. If this fails, it could prevent operation of your outdoor fan and compressor. Don't forget to check all your wires and connections. Always shut off all power prior to reaching into the electrical compartment.
I hope you find this to be very helpful moving forward. :-)
Testing Run Capacitors

Failed Compressor Contactor



Apr 03, 2010 | Ruud Central System Air Conditioner

1 Answer

Outside unit runs continuously, even when system is off.


On A/C units, there is a low voltage line that leads to a contactor, which engages to close the high voltage circuit to the condensor unit. Over time, the accual contacts in the contactor can weld themselves together. Try shutting off your furnace breaker but leaving on the one for the outside condensor unit. If it still runs, your contactor probably needs replaced. Contact a licensed electrician or HVAC contractor and tell them you think your contactor is in need of replacement. Is a fairly simple and quick replace, but the contactor itself is not cheap.

Oct 10, 2009 | Ruud Central System Air Conditioner

1 Answer

RUUD Air Conditioner not turning on


Need to check the breaker to the unit at the electrical breaker box. You should have a dual 60 amp breaker that runs the unit. Also if you removed the front of the furnance on the inside the system will not work unless the front of the furnance is on. There is a safety switch that will not allow the system to run with the door off. There could be the problem if the breaker is on and electricity is supplied to the unit that switch may be out and need replacing. The furnance is operated on 110 volts the condensor (outside section) operates on 240v you need to insure that the proper voltage is supplied to both.
Since both units work together yet operate seperately if the furnance comes on and the condensor doesn't then there is an electrical problem at the condensor (more than likely the contactor switch) if the condensor comes on and not the furnance then there to is an electrical problem (either 110 volts not supplied) or the switch to the safety cut off is bad. Now if neither furnance nor condensor comes on there could be improper power to both or a bad thermostat since the thermostat activates both furnance and condensor. Good Luck on repairs

Dave

Sep 04, 2009 | Ruud UBHC Air Conditioner

1 Answer

Evaporator comes on, but the condensor unit does'nt.


Have u checked at the compressor unit. There is a contactor than energizes the compressor is this contactor getting supply when u turn on the evaporator this contactor get energized see if this happens. If this is energized and you are getting supply to the compressor and compressor doesn't turn on 1.) compressor has thermal protection this might be faulty 2.) or the compressor has too much freon 3.) check if the windings of the compressor motor are not short to ground

Jul 24, 2009 | Mitsubishi MXZ30TN Air Conditioner

1 Answer

I have a weatherking 13AJA60A01 Ac unit and the condensor fan is not moving, I can hear a sound assuming electricity goes through the system but the condensor fan not working. The unit is just 1 year old...


Weatherking has five year parts on there equipment. You may just have a breaker kicked or tripped float switch. Check for stopped up drain Shop vac **** out stoppage from the outside drain line for unit. Check breaker. The sound you here maybe the contactor. It energizes from the tsat inside. If the contactor energizes. You have a high voltage problem. Your warranty covers aprts not labor. So call a Rheem ,Ruud or Weatherking dealer. Any of these dealers can handle warranty parts. Rusty Feadback please.

Jun 13, 2009 | Weather King 10AJA3601AH Air Conditioner

1 Answer

High pressure cut out control module is locking out the restart of condensor, if you hit reset button, condensor will start up, changed air filter.system is a ruud 12 seer heat pump with scroll inside


You need to pull the condenser shroud and hose down the outside unit really, really well and I can't stress that enough. The pressure switch helps protect the outdoor unit. There are only two things that will cause this to trip.....dirty condenser coils and a blockage in the high side of the unit. On a Ruud, to clean it good, you have to remove the shroud.

Mar 23, 2009 | Ruud Central System Air Conditioner

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