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I have a 19yr old Ruud Achieva 9.I have no AC at all. I have checked large barrel fuses - they are ok. Contactor clicks and you can see a spark at the contacts. Fan works. I don't hear a spin up of compressor. compressor is really warm though... seems higher than ambiant temp. I don't see any bulging or leaking of the start capacitor. I don't think the compressor is running. I, earlier, checked the filter at the squirrel cage because I had low flow. Cleaned it thinking insufficient flow = frozen condenser. I don't see a push-button switch or anything on ''high side'' to press. How can I check the start capacitor?

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You need a capacitor checker or with an anolog meter on ohms first turn off power remove capacitor short capacitor out with a screw driver test it a bad capacitor needle wont move good one needle will read resistance then go back down to 0 if the condenser fan is running some thing up with the start components becarfull good luck to make sure condenser and evaporator are clean Tom

Posted on Jul 02, 2009


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I have a Ruud Model UAFD-036JAS Air Achiever 9 split system, when i try to turn on the a/c, nothing happens. I've replaced the contactor, run cap., put in a starter cap for the compressor, replaced...

If you push the contactor and it runs why replace all that stuff??? You have to figure out where your 24 volts stops on its way to the condenser contactor. wire red green and yellow together at tstat, this should bring on indoor fan and condenser. if idf runs but cu does not you have an issue either going outside or a pressure switch is tripped. if nothing runs you have no 24, either a blown fuse, tripped float or bad transformer.

Oct 03, 2017 | Ruud UBHC Air Conditioner

1 Answer

Why is my AC not turning on in the outside unit??

1st off check the breaker for the unit outside,
reset it off and then back to on, it should positively click,
if crunchy or anything other than a crisp click,replacement is indicated.
If that is not the issue, go to the electric disconnect at or near the unit.
It may be on the wall with a cord going to the AC unit.
Open the lid and see if there is a fuse block/plug that has a metal handle, remove and test/ohm the fuses for continuity, if no tester is available
a battery and a light will work with wire, just use the fuse in the circuit
to see if the light works.Odds are the fuses, Time delay type fuses
(important) are blown/bad.Always buy time delay fuses! the non delays will fail, its a good idea to replace these every other summer.
If this is not the issue then the "contactor", a 24 volt electromagnetically actuated relay is what controls the high voltage to the fan and compressor
in the AC unit. You will need a meter to check for power,
24 volts at the coils terminals on the contactor and 220-240v
at the contactors terminals.Carefully depress the contactors top part that moves with contactor energization with an insulated screwdriver, this will simulate the contactor operating normally,and if that works you know the issue is not the compressor or fan.As always with power unless familiar with it, I dont suggest to try the testing beyond the fuses.

Sep 09, 2011 | Ruud UBHC Air Conditioner

1 Answer

Compressor on Ruud Unit UAMA-042JAZ and its fan won't run. Electric comany said low voltage circuitboard problem. Suggested replacing the fuse on the circuitboard. I could not find a fuse, where...

The units has what you call a contactor which is actually a relay but it does not look like a relay. You can get a none conducting material to depress it. and the compressor should run and the fan. Be very careful since that contactor has exposed parts and it has 220 volts running through it. That contactor coils is energized by low voltage current usually around 12 to 24 volts and it is supplied by a small transformer near the evaporator in the attic. There is a contact and when the contactor is energized magnetic field pulls it in so the contact on the 220 volts touches and the AC unit runs. Another word of caution, do not turn the unit manually one after another. this may damaged the compressor. Wait a few minutes each time you manually push the contactor to see the problem. Good luck.

May 28, 2011 | Ruud UBHC Air Conditioner

1 Answer

I have a 20 year old RUDD Heat Pump, model UPFB-036JAS. The outside unit does not come on. I changd the contactor, but that did not fix the problem. I have a multi meter now and the contactor does not have...

Can you trace the voltage from the main, thru the fuses, and to the top of the contactor?
If you have voltage at the bottom of the fuses, (Usually indicating the fuses are OK)-- where is the voltage interrupted, before it gets to the input of the contactor?

To be sure the fuses are good, have you measured them (removed!) with your Ohm Meter?-- are they less than 1 ohm resistance? (Open fuses will be Infinite ohm).

Tell us more about the Voltages, and your tracing them out.

Mack B

Dec 27, 2010 | Ruud UBHC Air Conditioner

1 Answer

My downstairs Ruud AC will not blow any cold air. The fan in the outside unit does run.

Is the compressor running in the outside unit? If it is then check the capacitor for the fan and replace if necessary. If it's good then check the fan motor. If the compressor is not running also, check the circuit breakers or fuses and the contactor in the outside unit. Let me know what you find or if this helps, please rate it.

Aug 04, 2010 | Ruud UBHC Air Conditioner

1 Answer

How do you tell with a voltmeter if the contactor coil is bad?

Check for 24 volts AC at the coil. If you do not have 24 volts at the coil (with AC turned on at your thermostat), then your problem is not with your contactor, but rather a control problem. If you have 24 volts at the coil, check for 240 volts on the LINE side (commonly marked L1 & L2) of your contactor. If you do not have 240 volts, check for open fuse or tripped or bad circuit breaker. If you have 240 volts, check for 240 volts at the LOAD side of your contactor (Commonly marked T1 & T2). With 24 volts on your coil and 240 volts on the LINE side, you should have 240 volts on the LOAD side. If not, the contactor is not making contact.

You can also perform a continuity test as shown in this video:

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Headlights won't come on. Fuse ok. 1995 Olds Achieva


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The outside unit on our Ruud heat pump won't turn on. The inside fan blows but the unit outside sits idle - no fan turning, nothing. It was cooling earlier today, but when I came home from shopping, the...

first look for red button neer the copper line set if has one push it second inspect thermostat wires for weed eater damage check disconnect for fuses check breaker at main panel pull disconect and remove cover check stat wire connections look at the capacitor if swelled up on top bad if all look ok put disconect in using insulated object manually push in contactor if unit comes on check for 24 volt ac on yellow stat wire to common if none stat wire could be loose at indoor unit or stat bad hope this helps you

Jun 05, 2009 | Ruud UPMC036 Air Conditioner

1 Answer


contactors are just a switch l is the power t is the load (check the coil voltage see that its the same) dan

Jul 17, 2008 | Ruud Central System Air Conditioner

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