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Ruud upnl troubleshooting

My HVAC's fan keeps blowing even when the unit isn't blowing cold air into the home. How do I get it to shut off?

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  • stan mccune
    stan mccune Oct 16, 2013

    I should have specified that I have adjusted those settings and it's not the problem. The fan outside is running even when no air is blowing inside the house. The fan is set to auto, and it doesn't matter whether I change to any other setting for that or for the air or heat. It never shuts off.

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  • 56 Answers

There are usually two fan switch positions.. AUTO and ON. make sure it is on AUTO.

Posted on Oct 16, 2013

  • 4 more comments 
  • stan mccune
    stan mccune Oct 16, 2013

    It is on auto. I've tried to change every setting on the thermostat and have had no luck. The fan is just running constantly on the unit even when no air is blowing inside the house.

  • Jambam Oct 16, 2013

    Is the compressor also runing or just the outside fan. If the compressor is also running then the contactor is likely stuck on.. the contacts of the contactor sometimes fuse together due to heat build up. Need to replace the contactor. You will need to make sure you discconnect power to the compressor.. whould be a disconnect switch near the unit.

  • stan mccune
    stan mccune Oct 18, 2013

    The compressor only works when it should (i.e., when it's cooling things down inside) but the fan runs 24/7 regardless of the compressor. And it's not blowing into the house (again, unless it is cooling things off). It is simply running but not blowing most of the time.

  • Jambam Oct 18, 2013

    very strange. is the fan wired to a seperate relay and not the contactor ? What make/model unit is this ?

  • stan mccune
    stan mccune Oct 18, 2013

    I'm not sure about the wiring - that's something I'd have to check. The model is Ruud UPNL - 037JAZ.

  • Jambam Oct 18, 2013

    could be the condensor fan relay on the defrost board. it is supposed to turn on when calling for heat or cooling but shut off when defrost is occuring. Maybe the contacts on that relay are fused together.

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Oh, the compressor motor's borked or overworked and overheating, or its capacitor failed short (perhaps the motor is shutting off from thermal shutdown...but you get to find out whether that's so. Be safe.) Alternately the temperature sensors have gone touchy on you. Once you gently vacuum it clean, try keeping incandecent bulbs in series with the compressor to get an idea of how loaded that thing is as it runs for those 5 minutes or so; the load might change more than you expect, just pay attention.
Hopefully you won't have to replace the compressor or motor; but it's doable if you're a certified technician with like equipment (so you can handle the refrigerant decently.) Most shops will streamline a bunch of similar jobs together to cut the waste and setup time.
Bigger conditioners are so much more efficient than little ones...syndicate the A/C?

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SOURCE: comp shuts off

Coils could be dirty. Compressor could be getting too hot and cutting off. Will have one fan motor that turns condenser fan and evaporator blower.

Posted on Jun 08, 2008

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SOURCE: Daily reset of outside unit

I have the same unit and was having the same problem. My brother works on A/C's and told me that the coils most likely needed cleaning from the inside out because when they are clogged with a lot of debris the system will overheat and cause that switch to trip and so far it has worked. What you need to do is turn the main breaker off to the outside unit first then take the four screws out of the top of the unit, use a flat head screwdriver and lift the fan it's self up out of the carefully taking caution of the wires going to the fan, then take the garden hose with a spray nozzle and wash the coils from the inside spraying through the coil to the outside and then wash the louvers off of all the debris and this should help.

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stat or low battery in tstat

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SOURCE: Ruud heating/ac unit blowing only cold air in heating mode

Do you have gas or electric heat. If you have gas then you do not have a heat pump. You should in most cases have a red,yellow, white, and green wires coming to the thermostat. R should go to rc/rh G should go to green Y should go to Y and w should go to W. Also the switches on back should be switched to non heat pump and gas rather than electric. Hope this helps.

Posted on Feb 16, 2009

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