Open the hood and locate the fuse relay box on the driver's fenderwell. Got the fan to spin manually, so figured the issue was just the capacitor. If the motor shaft is loose, or... if it won’t turn at all, replace the fan motor. If either switch is open no 24v signal reaches the contactor. On the other side, the fan blade directs the air over the evaporator coil. Cond Mtr 1/5 H.P. Wait up to 5 minutes for the thermostat to reset and send power to the contactor. Just FYI.The engineers prefer that we consumers do not stop and start the compressor more often than once every three minutes. The dual shaft fan motor (or circulation fan motor) might be defective. It is 2 yellow wires going into a junction on a copper tube where, I assume, freon flows. Discussion Starter • #1 • Feb 20, 2008. Connect the black lead to a ground and then to the blower motor assembly. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. The air from the outdoor unit fan was not as warm and the thinner tubing was not as hot. You have low and high pressure switches. Pretty easy to depress the pressure port strader valve to make sure you still have good pressure. It was humming and the fan was not turning. Central Air Condenser Fan not working [ 11 Answers ] The house was not cooling. https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#. Let me see if this link works better for you: http://goo.gl/mUACR. The circulation fan motor has two fan blades: one on either side of the motor. The delay on break is not necessary with a digital thermostat. On one side, the fan blade draws in outside air over the condensing coil to dissipate the heat. If no volts on YELLOW and COMMON either the thermostat is bad or you have a broken thermostat wire. The rad fan only comes on when the engine gets hot, and it works well to keep the engine temps down. 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. contactor solenoid terminals. You mentioned the AC doesn't quite turn on well. Going to follow your prior instructions for testing voltage at contactor. Step 1. We can rule out the capacitors since the compressor and condenser fan start when the contactor is manually actuated. 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. A capacitor stores up energy that provides power to your air conditioner’s fans. turn the thermostat to fan on merely. MASTER SAMURAI TECH It worked perfectly well before, now the heat will not operate. 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. Set the thermostat for COOL and lower the temperatture on the stat. If the compressor is running, but the fan motor is not running, the fan motor or the fan motor capacitor are likely at fault. If you do not have 24 volts here,re-set the pressure switch. Push in on it and see if it makes a click. If … ), Air Conditioner Temperature Control Thermostat. Turn power on at air handler and condenser. at COMPRESSORE FAILURE DIAGNOSIS. If voltage is good,press the center bar of the contactor by hand to see if the compressor and fan motor come on. Thanks. If you do not have voltage it could be the thermostat,the low voltage wiring or a low pressure switch in the condenser circuit. If they will come on,set the thermostat for COOL. It will have a thick gray cable leading into it (that's called the whip). If the fan isn't working: make optimistic the air handler has finished means. The capacitor replacement was the only thing I've done to it other than clean it. 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. The higher the SEER rating, the more efficient the unit. I tried purposely flying over speed bumps but this time, it didn't make the fan work. I have a lennox 13acd. ... Any good way to test what needs to be replaced? How do I locate/identify the service disonnect? ). base line. A bad capacitor is a common A/C problem with a straightforward fix. Remove the 2 BROWN wires from the delay on break relay. To remove debris from the air filter, try cleaning the filter. If the fan isn't working, that can cause the coil to freeze. 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. The fan will discharge the battery quickly if left running. 1) 40/3 = 40 is for the Compressor ... 3 is for the Fan ... 5 is nearly 2x3 .. more important what voltage rating ? Look on the inside of the lid and for the mapping of the fuses and relays with their location. Check for 24 VAC across them when the thermostat is calling for cool. 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. The low pressure switch is probably inside the hermetically sealed compressor. To determine if the motor bearings are defective, wiggle the motor shaft. If the blade does not turn freely, this indicates that the motor bearings are worn out. Not interested in being an HVAC sleuth? 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. 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. Check The capacitor for weak or damaged. Try turning the blade by hand. 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 […] Will take a picture and and post it. If it is in the air conditioning mode, check for ice around the evaporator coil and on the refrigerant lines at the indoor unit. What’s going on? You can adjust your cookie settings, otherwise we'll assume you're okay to continue. small clicking about every 5 seconds near the capacitor. Edit: Looking at that schematic again, I almost doubt it is the fan, even. It is sort of the equivalent of a hard start capacitor nowadays. HOWEVER, the radiator fan does not turn on with the compressor. The thermostat monitors the temperature of the air. If the fan runs but the unit does not cool, you need a new thermostat. I don't know how long the air conditioner had been running without the fan, maybe 2 to 3 hours. Thanks - capacitor still holding charge is possible. Post the wire colors and their letter designation. Is there a good way to troubleshoot what other parts may need to be replaced? My RUUD AC is not working - not blowing air or coming on. Thanks. When the AC is switched on, the compressor clicks on. There is also a brown wire and a yellow wire running off the side of the contactor to the delay-on unit. 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. If the air filter is clogged, air cannot flow properly through the air conditioner. Remove the lid. Your LP switch should only be out if you lost most of your freon. The furnace in the basement was blowing, so I went outside to check the condenser unit. Make sure you wait for the time delay. Scenario B: You don’t hear the outdoor unit’s compressor working and the fan isn’t spinning. If you have voltage the contactor is bad. Use the meter to verify 220volts at the incoming side of the contactor. The ECU signals the radiator fan to work at the precise time. open up the air handler and heavily attain in and take a examine out to spin the fan interior the … 5 Common Reasons Why Your Central Air Conditioner Fan Is Not Working. Jumptrout will explain how to bypass that, which is almost certainly the problem child here. (Pt #51-23055-11, … This sends YELLOW(low voltage line) to the contactor. 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. 51-23055-11 Rheem-Ruud 1/5th H.P. huge storm here last nite and A.C worked until storm. This will send the COMMON from the transformer directly to the contactor. Here is a picture of the circuit diagram that's on the inside panel: https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777003130614315954 It pretty unclear so I drew a diagram by tracing the wires to the different devices: https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777086934698155634. Once you provide the thermostat schematic I can instruct you on by-passing the time delay. If the thermostat ... does not have continuity, replace it. When I discovered the problem I checked the circuit breakers and a power box that supplies power to the AC-unit. What about the big black cylinder at the top with the red wires coming out? Should I test those? ... Preferably auto. 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). What I labeled "freon valve" may not be a valve at all. What you have marked "freon valve(?)" August 6, 2012 in DIY Appliance Repair Help. Then use the meter to check for 24 volts at the contactor solenoid terminals located on each side of the contactor. Sorry, pull the outdoor plug first, then set your a/c to cool. ... https://picasaweb.go...itionerAug2012#. 96 E38 Don't know if its related or not, but here's a history on the problems i've been having. We carry more than 4 million parts from over 175 major brands, so chances are, we've got the part you need. But first, your service disconnect will be a gray metal junction box with a lid. I agree; bypass the delay timer. I turned it off for 10 minutes and turned it back on with no luck. Refer to your air conditioner’s wiring diagram for more information. If that hasn't occurred, you're neglecting it. You go outside to check the A/C unit, and it’s buzzing but the fan’s not spinning. Is your air conditioner not blowing cold air? INside fan is blowing, outside fan is not. If the blade turns freely, test the incoming power to the fan motor. When the compressor is not coming on, your air conditioner unit will not run properly. This happened 2 weeks ago and technician said it was blown low voltage control fuse in air handler. 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. 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. If you are certain that all of the other components are working properly, replace the relay board. One other thing - when I first went to replace the capacitor, for some reason, there was still electricity going to the A/C even though I had turned off the breaker. 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.. All you have to do is pull the plug on the outside of the house. (Blue should be yellow.). The good news is, it’s pretty easy to find out. Here are the relevant pictures (last one is of the unit with the replacement capacitor installed. I had a similar situation recently. HOWEVER, it is only one speed (a low speed). It was smaller in diameter than the old one, so I needed to fill with some weather stripping.) This greatly reduces the cooling capacity of the air conditioner. If the thermostat is defective, it may prevent the fan from working. I presume that I need to change out the contactor...correct? 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). Got the fan to spin manually, so figured the issue was just the capacitor. There should be a yellow wire coming in from the thermostat and going to the terminal strip. Yes, digital thermostat. Model number: UAPA-024JAZ - see picture here for entire label: https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5774080675971223330. Ac was working … It was not passing voltage to the contactor. Example: Red on R....Yellow on Y....Blue on C.......etc. contactor may break only one side. Step 2. Hold times are long. on Y. Symptoms of a Central A/C Fan Not Working. Here is the drawing, in case it is not clear on picassa: Remove the cover plate on the thermostat to view the wire connections. ), or, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5774080675971223330, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777003130614315954, https://picasaweb.google.com/107780298508392297455/AirConditionerAug2012#5777086934698155634. Last Monday, I came into the office in the morning and the air handler was blowing air, but the A/C unit was not working, such that the A/C was blowing warm air. Looks like White on W, Red on RC and another red connecting RH and RC, then Green on G, and Blue(?) If the coil froze, the fan could be working but the air wont go through the ice until it melts. Radiator Fan Cost. have ohmed out fan and continuity on compressor. The HP switch has a reset button next to the suction line connection on the back of the unit. fan volts were within two volts of each other and still not working. Open that cover and you should see a pull-out connector or a heavy duty switch. Already ordered? There are a few ways to tell if your A/C fan is temporarily or permanently out of order. This is the most used and the most efficient setting. 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. I managed to get some sparks before I realized this and turned off the main feed to the house. The anti-short cycle timer is the "delay on break" circuit you have marked there. We have placed cookies on your device to help make this website better. Any good way to test what needs to be replaced? Heating & Cooling Products: Water Heating Products: Register Ruud heating and cooling products: Register Ruud water heating products: Verify details for your Ruud heating and cooling products: Verify details about your Ruud water heater product warranty: Pool & Spa Products : Register Ruud pool products. Turn the thermostat off, then on. 4. Powered by Invision Community. Is it possible I shorted something or fried one of the electrical parts? If you have a wiring diagram,post a picture of it here. If the relay board isn’t working properly, the fan might not run. If you have 24 volts here,replace the contactor. It's possible the capacitor was still holding a charge. Modern air conditioning... it’s a wonderful thing in the heat of summer when you can go inside and feel the relief from a hot, sticky summer day. Cond Mtr (come see the list of models of condensing units and heat pumps this fits) 51-23052-11 Rheem-Ruud Cond Mtr (1/2 HP Heat Pump and Condenser Fan Motor used in many units). RUUD Achiever 10 SEER AC Compressor Copeland Compliant Scroll Model# ZR36K3-PFV-230 Serial# 00FZZ418T RUUD Air Conditioner 09/00 Model# UAKA-037JAZ Serial# 5429 M4300 07527 The fan does not spin and hence no cold air. Blue on "Y" is the guy we're after. Control boards are often misdiagnosed; make sure you check more commonly defective parts before replacing the main control board. Hopefully this unit was professionally installed by a reputable contractor. There's a red rubber button sticking out. You should have not only a circuit breaker but also a service disconnect at the condenser. 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. Trace your components for power both low and high voltage. fan spins free. Now he knows he can safely bypass the timer in the condensing unit, at least temporarily. After some investigating, you determine that your outside AC unit isn’t running but the inside is. 19 Posts . 51-100999-04 Rheem-Ruud 1/5th H.P. 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." Also, here are two pictures of the label on the new capacitor, as installed. Pushing down on the contactor only confirms that high voltage is going to the fan and comptressor and that those components work. However, the radiator fan does not always start spinning on ignition. You will need a volt meter to do the test. 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 the motor bearings are worn out, replace the motor. Look closely at the contact points on the contactor. 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