Check for power at the motor itself. Remove the door on the front of the furnace cabinet to give you access to the blower (it might be on a slide-out drawer.) When the break is located, repair or replace the wiring harness. If you turn the switch on, you should get a reading between .01 and .03 ohms. Check fuses first. The meter should read between 9 and 11 volts or the test light will light up. A blower fan Manual ON switch is also included on many fan limit controls. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Observe safety precautions while working with electricity. Then you can re-tighten the tension once the belt is in place. 01 - Blower Motor. Check the AFC (automatic fan control) for dust and other accumulation. 4-Check the filter. Just set it one calibration mark closer to the “longer” setting if the furnace goes off and on too frequently or one mark away if the furnace allows room temperature to rise too high or drop too low before going on or off. Can see refrigerant coolant in look-in glass connected to the line, all power lines going from the unit to the house are good, circuit breakers on the outside panel next to the unit are on. Rotate the blower pulley by hand, holding the belt in place but keeping your fingers from getting caught between the belt and the pulley. The blower fan stopped working on my RUUD Cooling / Heating System While attempting to raise the temp higher the fan stopped working. If the furnace cabinet makes rattling noises when it runs, be sure the cover panels are screwed on tight. The blower fan motor is not operational. 1-Be sure nothing is blocking the flow of warm air. Look for a break in the wiring harness if the test light does not light, or the meter shows no value, there is a break in the wiring harness between the switch and the battery. A wiring diagram for the specific vehicle is also helpful. In many cases, it’s a good idea to remove the belt and buy a replacement at a home center. First, check to be sure that your thermostat is set to “heat” and not “cool,” and ensure that the fan is set to “auto.” Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. Fan Control. If it has, turn it to Off or to Auto. In some cases, a malfunctioning thermostat may require adjustment or replacement. The video below shows you how—note that this guy fixes it in about 5 minutes. Based in North Idaho, Troy Lambert has been writing how-to pieces and historical articles for magazines such as "Woodworking" and "Outdoor Idaho" since 1994. I changed the thermostat from a … Then, if possible, remove the sensor from the furnace. Unaddressed, dirty furnace filters can cause extensive, and expensive, damage to your home’s heating system. If both the compressor and the fan motor won’t run, use a multimeter to test the temperature control thermostat for continuity. Furnaces made by Rudd tend to be the technological stuff of high quality. Usually used on roof tops and heat/cool units. Use the meter to verify 220volts at the incoming side of the contactor. looking at it right now and it does not look like the others I have seen so far. Contractor's Assistant: How long has this been going on with your Ruud furnace? Fuse failure often causes component failure. If you see or hear the fan turn on, your blower motor is not the culprit. First, turn off all power to the unit and turn off the gas at the gas valve that serves the furnace. Two things can cause a blower to run continuously: the room thermostat or the limit switch located on the furnace just below the plenum (the box that distributes heated air to all the ducts). To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests. Set of 4 Furnace Air Blower Squirrel Cage Fans. Connect the black lead to a ground and then to the blower motor assembly. The belt should slip right into place. Lambert is also a novelist and has a diverse technical and philosophical education. Disconnect the connector and set the multimeter to ohms. If the gas odor is strong, immediately evacuate your house, leaving the door open. A dirty furnace filter can limit the airflow through your furnace and cause it to overheat. After that, if you have an induced draft fan, the pressure switch will close because of the induced draft fan running. And all appear to be identical. If your furnace runs and provides some heat but not enough. This is generally a job for a professional, On an electronic-ignition furnace, turn down the thermostat or turn the power switch off and then on again to reset the ignition control module. If you have an older furnace with a standing pilot light, it’s possible that the pilot light has been extinguished. Our home Ruud Central AC unit stopped working yesterday. If not, skip to Step 4. Dirty furnace filters are one of the most common causes of a furnace failure. Listen for the sound of the spark or watch for the hot surface ignitor to glow. Track along the duct runs, listening for the sound. The serial number is W********* and the model no, is RQRM-A***JK***. Make sure your fan is set to AUTO and not ON. Replace fuse if blown; if not, proceed to Step 2. When the blower fan won't start the problem could be something as simple as a blower compartment door that is not fully closed, or a clogged condensate drain. Not all systems have this fan. Using a test light or a multimeter set on volts, unplug the blower motor. If you have a spark ignition the ignitor will spark. 19 thoughts on “ ECM 2.3 Variable Speed Blower Motor Troubleshooting ” Mark Hemmes January 2, 2021. If the fan isn't working, that can cause the coil to freeze. Scrub the sensor gently to remove dust and other residues. You don’t need to know what a blower motor is to check that it is working properly. Dust and debris inside the thermostat can cause it to malfunction. It has a shudder on start up. This is the first winter the system has been used. (If the pilot doesn’t light on the first attempt, wait a few minutes and repeat the procedure, this time depressing the reset button for 45-60 seconds.) Next check and clean the furnace’s flame sensor. Test to see if the switch is getting power from the battery. A pinging or popping sound coming from the duct work can come from thermal expansion—the ductwork expanding and contracting as it heats and cools. Keeping too many heat registers closed can cause heat to build up in your furnace, forcing air out of duct leaks and requiring the blowers to compensate for the added pressure. If there is a battery, check if it is working properly. First, confirm that the light is out. We were told yesterday by a technician it would have to be replaced. The flame sensor safeguards your furnace against the unsafe burning of fuel, and a dirty flame sensor may cause your furnace to function improperly. Connect the red lead to a power source and then to the leads on the motor side of the disconnected connector. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, "Haynes Techbook, Automotive Electrical Manual"; H. Haynes; 1990. Once the pilot is lit, turn the gas valve back to the on position. He holds a technical certification from the Motorcycle Mechanics Institute in Phoenix. If you find neither the motor nor the switch faulty, you may want to leave the deeper troubleshooting to a professional. If you realize the repair is needed, just try to look at the guide given here first. If your furnace won’t turn on, go to your furnace (if it is accessible to you), and peak in the little plastic window on the side of it (most modern furnaces will have a window). You are looking for a blinking green light. Check Your Furnace Blower Fan. If the motor still does not turn, the motor is bad. If the meter shows the correct voltage, or the test light illuminates, the switch is getting power, skip to Step 3. It’s normal and starting to panic is the worst option possible. If the coil is frozen, shut off the air conditioning immediately. I always troubleshoot and test the least expensive parts first. If it is set to Off or Auto, the furnace’s limit switch must be adjusted. If the blower is making a grinding noise, shut off the unit and call a furnace repair technician; the motor’s bearings are probably shot. The thermocouple is a copper rod that the pilot flame heats-up. If your furnace fan is set to AUTO and is still running, then move on to the next section. When matched with Rheem outdoor units, the coils provide a nominal capacity of 24,000 to 60,000 BTU/HR [7.03 to 17.6 kW]. Or, the belt is improperly aligned or worn and needs replacement. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. Anyway, we should understand that the pilot light has been turned on many cases, a thermostat! The leads on the blower fan failure, isolate the motor side of the blower fan,... Squirrel cage it has, turn off all power to the on position too much, clean or the. Leak, deal ruud blower fan not working this immediately voltage is recorded, you may to... Blown ; if not, proceed to Step 2 then move on to the on position, the! Over-Tighten it ; this can wear out the motor nor the switch is getting to the on. 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