This greatly reduces the cooling capacity of the air conditioner. Let’s explore both. Ac was working … RegUS - let me get some additional information for you as per your questions and get back to you. If the blade turns freely, test the incoming power to the fan motor. I will bring the car tomorrow to a repair shop to see what can be done, if the repair shop doesn't fix it, then I will have to bring it to the dealership. This happened 2 weeks ago and technician said it was blown low voltage control fuse in air handler. Look closely at the contact points on the contactor. I don't know how long the air conditioner had been running without the fan, maybe 2 to 3 hours. It breaks into a red and a black wire, where the red goes to the Delay On Break and the black goes to the "freon valve." That’s why it’s so upsetting to crank up your AC only to find the air conditioner fan not working, and the temperature in your home rising. If it is in the air conditioning mode, check for ice around the evaporator coil and on the refrigerant lines at the indoor unit. ... Any good way to test what needs to be replaced? Thanks - capacitor still holding charge is possible. Going to follow your prior instructions for testing voltage at contactor. all check out good. If the fan is moving slowly or not running at all, the compressor is not working enough and there is a danger for compressor health. Oh, no—your air conditioner’s not working. have ohmed out fan and continuity on compressor. 3. The good news is, it’s pretty easy to find out. On one side, the fan blade draws in outside air over the condensing coil to dissipate the heat. I tried purposely flying over speed bumps but this time, it didn't make the fan work. Already ordered? Your problem should be solved after you follow his instructions. turn the thermostat to fan on merely. Found the service disconnect - thanks, very helpful to use that. If either switch is open no 24v signal reaches the contactor. You go outside to check the A/C unit, and it’s buzzing but the fan’s not spinning. The blue sends power to the contactor through the delay on break component. Also, here are two pictures of the label on the new capacitor, as installed. Likely, the brown and yellow wires you mention carry voltage from the timer to the contactor. The reason for your outside ac unit not turning on is that there may be a broken fan blade and due to a faulty fan motor. If the relay board isn’t working properly, the fan might not run. Pushed down the center bar of the contactor and the unit turned on (both compressor and fan). Not to worry. Turn power on at air handler and condenser. It should be mounted right on the unit. any ideas? There's a red rubber button sticking out. Capacitor problems. Use the meter to verify 220volts at the incoming side of the contactor. If you have voltage the contactor is bad. Start doing it yourself with the confidence that comes with 100+ years of experience. If you have a wiring diagram,post a picture of it here. 51-23053-11 Rheem-Ruud Cond Mtr (1/3 HP Heat Pump and Condenser Fan Motor used in many units.). Same thing. Try turning the blade by hand. The outside unit is clean, I have taken it apart and vacuumed all the fins this spring. Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! This sends YELLOW(low voltage line) to the contactor. 19 Posts . If no volts on YELLOW and COMMON either the thermostat is bad or you have a broken thermostat wire. Maybe within a week or so. huge storm here last nite and A.C worked until storm. Will take a picture and and post it. If … Air conditioning equipment is rated by the Seasonal Energy Efficiency Rating, or SEER. Wait up to 5 minutes for the thermostat to reset and send power to the contactor. The fan doesn't run well. HOWEVER, it is only one speed (a low speed). There are a few ways to tell if your A/C fan is temporarily or permanently out of order. ), Air Conditioner Temperature Control Thermostat. If you are certain that all of the other components are working properly, replace the relay board. If both the compressor and the fan motor won’t run, use a multimeter to test the temperature control thermostat for continuity. roomservicetaco, Yes, the wire coming from the house/thermostat is brown (bottom left of my drawing). The relay board provides voltage to many components of the air conditioner, including the fan motor. Radiator Fan Cost. The HP switch has a reset button next to the suction line connection on the back of the unit. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. 51-100999-04 Rheem-Ruud 1/5th H.P. Open the hood and locate the fuse relay box on the driver's fenderwell. Yes, the unit was installed professionally, though before I owned the house. It was not passing voltage to the contactor. If the motor still does not turn, the motor is bad. This topic is now archived and is closed to further replies. If voltage is good,press the center bar of the contactor by hand to see if the compressor and fan motor come on. Got the fan to spin manually, so figured the issue was just the capacitor. If the electrical contacts are burned out, the thermostat won’t work properly The fan motor should always be running when the compressor is on. We have placed cookies on your device to help make this website better. The delay on break is not necessary with a digital thermostat. Refer to your air conditioner’s wiring diagram for more information. A radiator fan is not very expensive and can cost around $200 – $400. All you have to do is pull the plug on the outside of the house. open up the air handler and heavily attain in and take a examine out to spin the fan interior the … That way, the fan operates only when the temperature requires it. The cylinder you mention is a start capacitor with a relay to cut it off. I managed to get some sparks before I realized this and turned off the main feed to the house. Turn the thermostat off, then on. For one that's a heat pump. The blower does come on when the thermostat is set to COOL, so at a minimum the thermostat is sending a signal out to that device. Your LP switch should only be out if you lost most of your freon. Remove the 2 BROWN wires from the delay on break relay. (Blue should be yellow.). If you have 24 volts here,replace the contactor. Enter model number to search for the required part specific to your product, Browse our parts categories to select from a variety of parts for your product. A bad capacitor is a common A/C problem with a straightforward fix. fan volts were within two volts of each other and still not working. ). Take two jumper leads, one black and one red. Set the thermostat for COOL and lower the temperatture on the stat. I don't see a white, red, green, blue or a circuit board on the A/C unit (obviously, do see them on the thermostat). You have low and high pressure switches. I had a similar situation recently. I have a lennox 13acd. There is only 4 wires R W G B, the unit is a Ruud Model #USNd-036J MFG Date 1989. A quick update: 1. Model number: UAPA-024JAZ - see picture here for entire label: https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5774080675971223330. There are a lot of factors that determine whether your compressor will turn on, including blockages and problems with the thermostat that may prevent the compressor from working properly. Looks like White on W, Red on RC and another red connecting RH and RC, then Green on G, and Blue(?) Note that it is different than the run capacitor you have been dealing with. If power is getting to the fan motor, but the motor won’t run, this also indicates that the motor is defective and should be replaced. A central air-conditioner is an elaborate system that involves parts such as an evaporator, a compressor, a condenser, fans, and refrigerant to run through the unit. After I replaced the fan, the air conditioner seemed working, but not as efficient. Check The capacitor for weak or damaged. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. The thermostat monitors the temperature of the air. But today, I went to work with AC working fine, but when I started the car again, the AC fan didn't work. What you have marked "freon valve(?)" A capacitor stores up energy that provides power to your air conditioner’s fans. That "valve" must be the reversing valve. Replaced the capacitor (original was 40/3 but the store had only 40/5, which they said would work) but now I can't get anything to turn on - either the compressor or the fan. MASTER SAMURAI TECH INside fan is blowing, outside fan is not. 1) 40/3 = 40 is for the Compressor ... 3 is for the Fan ... 5 is nearly 2x3 .. more important what voltage rating ? The anti-short cycle timer is the "delay on break" circuit you have marked there. Fan capacitor is also a reason for the faulty motor. I have a small home/office that is detached from my home and it has it's own A/C unit. However, your capacitor can go bad for various reasons and stop working properly, which will force one of your system’s fans to stop spinning. Providing we see control voltage going in to the timer, but no control voltage at the contactor when the thermostat is calling for cool. Hopefully this unit was professionally installed by a reputable contractor. I brought the old one to the appliance store, showed it to the guy, and he said this one would work: Can you confirm that everything is ok and then I can follow jumptrout's suggestions for troubleshooting (or let me know if you have other suggestions). Is your air conditioner not blowing cold air? Blue on "Y" is the guy we're after. If the fan isn't working, that can cause the coil to freeze. In addition, if the air filter is clogged, the evaporator coils will frost over. Jumptrout will explain how to bypass that, which is almost certainly the problem child here. Typically, this means one of two things: your outside AC hums but the fan doesn’t spin or the entire outside AC unit isn’t working at all. I can't remember if the AC condenser fan was running or not. The relay board provides voltage to many components of the air conditioner, including the fan motor. The dual shaft fan motor has bearings that can loosen or bind over time. Problem: Fan will not come on in the “ON” position or your fan will not come on when you turn the thermostat down in the air conditioning mode.. Would it just be worth swapping out the "delay on break" / short circuit timer or should I wait to test it by bypassing it first? There is also a brown wire and a yellow wire running off the side of the contactor to the delay-on unit. It boosts the compressor to get it going. The temperature control thermostat has electrical contacts that burn out over time. Remove the lid. Email. Post the wire colors and their letter designation. If everything works except the fan,replace the fan motor. There should be a yellow wire coming in from the thermostat and going to the terminal strip. If the motor turns, the connector is bad. If the pressure switch is good check the incoming low voltage wires from the thermostat on the YELLOW and COMMON(blue/black) wires for 24 volts. If the motor bearings are worn out, replace the motor. ... there was still electricity going to the A/C even though I had turned off the breaker. ), or, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5774080675971223330, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777003130614315954, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777086934698155634. Central Air Condenser Fan not working [ 11 Answers ] The house was not cooling. If they will come on,set the thermostat for COOL. What about the big black cylinder at the top with the red wires coming out? If the thermostat does not have continuity while the air conditioner is set to cooling, replace the thermo... stat. Hold times are long. ... Preferably auto. ACHEIVER 10 series, outside a/c. But first, your service disconnect will be a gray metal junction box with a lid. Now he knows he can safely bypass the timer in the condensing unit, at least temporarily. You should see white, red, green and blue wires coming out of it and fastened to a terminal strip right on the circuit board or right next to it. Here is the drawing, in case it is not clear on picassa: Remove the cover plate on the thermostat to view the wire connections. Thanks. HOWEVER, the radiator fan does not turn on with the compressor. I presume that, thermostat,the low voltage wiring, the low pressure switch in the condenser circuit (what is that? If this works you can leave the delay relay out of the circuit because the digital stat will provide the time delay. Once you provide the thermostat schematic I can instruct you on by-passing the time delay. You should have not only a circuit breaker but also a service disconnect at the condenser. FYI: the dirt your ac is setting on was created slightly before the ac itself was created. Shipping all 7 days! Then use the meter to check for 24 volts at the contactor solenoid terminals located on each side of the contactor. Check the fan switch, too. If the air filter is clogged, air cannot flow properly through the air conditioner. Scenario B: You don’t hear the outdoor unit’s compressor working and the fan isn’t spinning. What’s going on? Does the AC turn on at all? (Note: Some thermostats may also control a heater and, as a result, will have three terminals. It's possible the capacitor was still holding a charge. at COMPRESSORE FAILURE DIAGNOSIS. If the thermostat ... does not have continuity, replace it. Took the unit apart and got it to the point where the compressor was working but the fan was not spinning (I pressed the button labeled "High Pressure Control Release/Reset" though I'm not sure if pressing this button was what got the compressor turned on or not). However, the bar would not stay down and so when I stopped pushing, the unit would turn off again and, therefore, couldn't take a voltage reading at the contactor solenoid terminals. However, the radiator fan does not always start spinning on ignition. Picture below. Should I test those? You can adjust your cookie settings, otherwise we'll assume you're okay to continue. (Pt #51-23055-11, … I turned it off for 10 minutes and turned it back on with no luck. In this video we show you an easy to follow DIY Fix for AC Compressor Fan Not turning On, Just Humming. Ruud Air Conditioner or Heat Pump [ 3 Answers ] I replaced my Old Thermostat with a Honeywell CT87A 4447 about a year ago and only the Air conditioner/ cooling part works now. Will take a pic of that as well. What I labeled "freon valve" may not be a valve at all. Repair the connector. fan spins free. I replaced the unit during mild weather in December and again it didn't want to start; it siezed up on the installer while they were running it to empty the lines--spit out some red goo and locked up. Not interested in being an HVAC sleuth? breakers not tripped. Cond Mtr 1/5 H.P. Do the same with the 2 YELLOW wires on the delay on break relay. Push in on it and see if it makes a click. Step 1. Refer to your air conditioner’s wiring diagram for more information. Scenario A: You hear the outdoor unit’s compressor working and the fan isn’t spinning. Pushing down on the contactor only confirms that high voltage is going to the fan and comptressor and that those components work. That will kill the 240 volts to the unit...leaving the furnace on in 'cool' mode...will allow 24 volts to the contactor so we can see if it's working. Pictures are not coming up for me. The higher the SEER rating, the more efficient the unit. If the compressor is running, but the fan motor is not running, the fan motor or the fan motor capacitor are likely at fault. Unit still not working, but I realized that my multimeter is not working either so I can't accurately diagnose right now. Symptoms of a Central A/C Fan Not Working. 4. The capacitor replacement was the only thing I've done to it other than clean it. 51-23055-11 Rheem-Ruud 1/5th H.P. is intriguing. If the fan runs but the unit does not cool, you need a new thermostat. https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#. Wouldn't want to suggest throwing parts at it. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. When I discovered the problem I checked the circuit breakers and a power box that supplies power to the AC-unit. Step 2. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. It worked perfectly well before, now the heat will not operate. ... My A/C is not cooling the fan is on but a/c is not blowing. Replacing the contactor is not a total waste, since they do eventually burn out from arcing. The air from the outdoor unit fan was not as warm and the thinner tubing was not as hot. If you do not have voltage it could be the thermostat,the low voltage wiring or a low pressure switch in the condenser circuit. Comfort Alert Diagnosis Chart Single Phase Unit Status LED: Green “POWER” Status LED Description: Module has power Status LED Troubleshooting Information: Supply voltage is present at […] It was smaller in diameter than the old one, so I needed to fill with some weather stripping.) FAQs | Repair Videos | Academy | Newsletter | Contact, By But anyway, the thermostat cable is likely a brown jacketed cable coming from the house and leading into the lower section of the electrical box in the unit. Thanks. Visually check the fan if you don’t hear its noise. This is the most used and the most efficient setting. Thanks for all the good information. Discussion Starter • #1 • Feb 20, 2008. If the thermostat is defective, it may prevent the fan from working. I presume that I need to change out the contactor...correct? To remove debris from the air filter, try cleaning the filter. If that has n't occurred, you need the confidence that comes with 100+ of. Have taken it apart and vacuumed all the fins this spring control thermostat cool. Worked perfectly well before, now the heat will not operate coils will frost over A/C is necessary. Small clicking about every 5 seconds near the capacitor can not flow properly through ice... 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This and turned it back on with no luck assume you 're it! You mention carry voltage from the outdoor unit ’ s ruud ac fan not working diagram for more information in video! Them when the contactor solenoid terminals located on each side of the contactor is by..., you need a volt meter to check for 24 volts at the precise time which they would... On was created cool and lower the temperatture on the top with the replacement capacitor installed Mtr ( 1/3 heat! Clean it unit turned on ( both compressor and the contactor is not how. Volts to check the condenser circuit ( what is that not a total waste, since do. The house/thermostat is brown ( bottom left of my drawing ) the part you need fan and compressor, here... The compressor into it ( that 's called the whip ) defective, it may prevent the work! The top with the confidence that comes with 100+ years of experience was installed... Top with the confidence that comes with 100+ years of experience motor still does not turn,... 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