The pressure switch closing is a RESULT of the inducer motor running, not a cause of it running. The inducer fan is responsible for venting the exhaust gases outside your home. This loop repeats forever. Prior to that occurring, the furnace would kick out intermittently and not restart . My 10 year old carrier furnace refused to turn on. Touch each tester probe to one of the switch terminals. Inducer speed control method for combustion furnace US9261277; In a multistage combustion furnace having a motor driven inducer blower and a pressure sensing device or set of switches for sensing pressure in the combustion gas flowpath through the furnace, a high firing rate blower speed and low firing rate blower speed are set based on the blower speed setting required for a medium firing rate. But being stuck open isn't an issue; it's keeping you safe. Touch each tester probe to one of the switch terminals. Some other things that cause furnace pressure switch problems are: (1) A restricted vent pipe (2) Too long of vent piping and too many turns which exceeds manufacturer's recommendations (3) a stopped-up condensate drain line if you have a high efficiency condensing furnace. The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper air flow. If your pressure switch identifies an issue with the draft inducer motor, it will open. Set a multimeter to test for resistance (ohms). As part of the furnaces ignition system, the pressure switch will close once the draft inducer fan motor reaches its maximum speed. The pressure switch hose is damaged. The tester is supposed to read 0 or close to 0, showing . On a positive note, an open pressure switch means that dangerous gases are not entering your air. Something could be blocking airflow within the furnace. New inducer motor will not close pressure switch. You should only have to suck on it slightly to close the switch. This is a safety precaution to ensure that gas will not enter the furnace unless the toxic fumes within the burner assembly can be exhausted. Prior to that occurring, the furnace would kick out intermittently and not restart . Tapping lightly on the pressure switch body may open the switch and the unit may start. If the pressure switch is not closing when the inducer is ON then you might have a bad pressure switch or any of the other problems that are mentioned in this post that can cause pressure switch problems. NOTE: If there is a severe air leak in the collector box seal, pressure switch may not close or will re-open, resulting in no ignition or erratic burner operation. The resistance of the glower is of 70ohm, but it never turns on. Thread Starter. It originally had foam seals, probably original or at least very old and it seems they weren't air tight. so I have to pinch it around the connection (not closing the tube at all) to get a . Rheem 42-105583-09 - Pressure Switch. I can provide a light suction, the switch closes, and the furnace lights up. The other switch has two ports & one connects to the inducer motor assembly & the other connects to the burner box. OK, I have narrowed down my problem to the draft inducer motor or the pressure switch. If the draft inducer fan motor . Finally, if your pressure switch is misbehaving, it may also be a sign that your furnace's condensate drain is blocked. I also cannot feel any suction from the port on the induction motor. However, if there happens to be a problem with the draft motor, the air switch will stick open or fail to close. As a result, the switch will stay open. If either the air intake system or exhaust mechanism fails, the inducer cannot create negative pressure. What is a Pressure Switch on a Furnace? 1. You're already purchasing the item. NOTE: As part of the system check-out . The manometer has 2 connectors and the tube coming from the inducer is too big for the connection to the manometer. Specifically, you need to remove the panel that gains you access to the inducer fan assembly. New New New. If the inducer motor in your furnace is not starting, then the pressure switch won't close. I replaced the pressure switch with a manual switch. This is not a repair. You can tell the system is on some sort of safety lockout when the furnace's fan (or blower) pushes room temperature air through the ducts and into your rooms. The inducer fan is responsible for venting the exhaust gases outside your home. Since then everytime it gets 0F and colder the inducer mo … read more On the "first" call for heat, the high limit has cooled enough that the inducer comes on and the burner lights. When the draft inducer motor is faulty, it won't be capable of closing the pressure switch, so the ignition process will not start, and the furnace will turn off after a couple of minutes. The pressure switch opens. Please . I just installed a new switch and the problem remains. Second, it proves that the exhaust pathways are clear. Here is what I have tried: . It has two pressure switches. To fix a vibrating inducer fan, follow these steps: Power down your furnace. Things I tried, in order: A blockage in the vent will also cause a pressure switch to not close. The low-pressure switch should close and provide 24 volts AC between each of the two terminals on the pressure switch to a good ground. 3y Took inducer fan off, got some high temp silicone and resealed it. I have a Luxaire furnace installed in 1993 Model #PBNU-LD20P140D. Set a multimeter to test for resistance (ohms). Remove the pressure switch wires Turn the furnace on The draft inducer fan motor will begin to run As air is pushed out of the vent, a vacuum is created which should cause the switch to close. However, it's a pervasive problem because nearly 90% of all furnaces today are condensing units. Pressure switch closed with inducer off. Disconnect the wires connected to the pressure switch by pulling the wire connectors off of the switch terminals. Posts: 1 Received 0 Votes on 0 Posts New inducer motor will not close pressure switch. In fact, the entire purpose of the pressure switch is to ensure that the inducer fan is working properly. What initially happened was it would start then shut down (pressure switch closed with inducer off), then a relay would click repeatedly. The furnace pressure switch, aka air switch, is a safety measure device found near the draft inducer motor. Once closed, it will remain closed until pressure falls below 0.80". One switch connects to the collector box & is set to close at -.40 inH20. Find many great new & used options and get the best deals for CARRIER INDUCER BOARD CESS210102 & TRIDELTA FS6004-251 DD203 at the best online prices at eBay! First, that the inducer motor is operational and not failed (inducer wheel broken, etc.). If so, that's the SKU # at CSH Incorporated. Tech Tips Pressure Switch Not Closing FI0094. The inducer motor fan creates a negative pressure in the furnace heat exchanger. Member. I get 4 flashes on the board, High Limit, but the . In the normal sequence of operations, if the pressure switch does not close during this preignition period, the control board will not allow the furnace to light. If the multimeter does not show any sign of change in continuity and the switch fails to close, this is a sign that your pressure switch is faulty. 989-723-8985. Test the Switch for Resistance. Pressure switch closed with inducer off. It continues this cycle until the thermostat is satisfied. Using the incorrect inducer motor assembly could result in no pressure switch operation, poor ignition, poor combustion, erratic burner . With a multimeter, when I gently suck the pipe, it clicks, and the circuit opens. Pull the tube off and blow in it and you can get a paper clip and stick it in the hole the tube connects to on the fan side. Join Date: Feb 2020. . If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. $169.96. The inducer motor may not be coming up to speed due to failing bearings. I just can't get the switch to close from the hose to the induction motor. If the chimney is caving in, or Mr. squirrel makes a nest in the top of the flue stack, the inducer motor will not be able to establish the draft (negative pressure) required to close the switch. The pressure switch will feel the pressure change and close the switch, informing the control board that the furnace has the correct airflow. What is a Pressure Switch on a Furnace? Essentially, when I turn on the furnace, the inducer would start spinning for about 15 seconds, and I will hear clicking sound closer to the 10 second mark, and in the end the furnace will shut itself down. . If so, you need to determine why the inducer motor is not starting reliably. The pressure switch part number S1-02434562000 is a good part number and our parts program does not show any updated, new pressure switch . Turn off the power disconnect to your furnace so it won't turn on while you're taking it apart. Check the inducer wheel to see if it is damaged. Skip to main content. When you modify the thermostat, you will also send a request to the control board. When that negative pressure is great enough to circulate the combustion gasses through the furnace safely, the pressure switch should close. Second, it proves that the exhaust pathways are clear. The tester should read 0 or close to 0 (indicating no resistance). Coleman OEM Condenser Fan Motor - 1/4 HP 230 Volt. . I have a Concord 90+ efficiency furnace installed in my new house built 2.5yrs ago. The pressure switch must be replaced. I have a similar problem and everything looks clear. The igniter never gets to glow. You should only have to suck on it slightly to close the switch. I open it manually once the inducer starts, but I still have the same problem. If the switch is open, the inducer starts and the resulting pressure change closes the switch. A clogged port on the collection chamber to the pressure switch. If the inducer comes on, the pressure switch is stuck closed. Thread Tools Search this Thread #1 02-08-20, 04:55 PM B. BlackardDYI718. Remove the access panels to your furnace. The pressure switch part number S1-02434562000 is a good part number and our parts program does not show any updated, new pressure switch . Is it normal for the pressure switch to be full of water? There isn't much volume in the line to the bladder, so you should not get a continuous stream of air - the switch has a rubber bladder that flexes, that is . Turn your furnace back on. The Condensate Drain is Blocked. Disconnect the wires connected to the pressure switch by pulling the wire connectors off of the switch terminals. You will have to take a look at the flue. Of course, this only applies to condensing furnaces. If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. I also read that the pressure switch generally requires that the negative pressure created actually be a bit above the actual rating of the switch. YORK 026-42548-000 - INDUCER ASSEMBLY. When your pressure switch opens, this turns off the furnace and prevents it from lighting. Most times, you'll be able to hear or see the inducer fan turn on. Bird nests, snow, ice, leaves, and wasp nests are most commonly caused for blocked exhaust. I have a Concord 90+ efficiency furnace installed in my new house built 2.5yrs ago. If the pressure switch will not close as the board is flashing then you have found the problem. So, the stuck switch could signify that the furnace is struggling to provide fresh air for the combustion process or vent the combustion gases. This is to ensure a few things. Other problems that could cause the pressure switch to not open are a dirty blower wheel on the inducer. If you want to change just the blower wheel, see if your broken one has part # 8710-4358 stamped on back. Test the Switch for Resistance. The pressure switch works well. When I ordered in September 2010, part was $23.34 plus $7.80 to ship. $93.46. Every time the inducer stops, the status light goes off for a split second and back to solid red. . The pressure switch hose has water in it. Most times, you'll be able to hear or see the inducer fan turn on. Hello Phil! As part of the furnaces ignition system, the pressure switch will close once the draft inducer fan motor reaches its maximum speed. 5. The tester should read 0 or close to 0 (indicating no resistance). When the high limit trips, the indoor fan and inducer continue to run until the limit cools, then lights the burner again. If the pressure switch doesn't close after 3 to 5 tries, the control board will stop sending voltage to the inducer motor, essentially locking it out from attempting it anymore. What initially happened was it would start then shut down (pressure switch closed with inducer off), then a relay would click repeatedly. I got -2.20+/- inH20 manometer reading on this switch so it should close. In fact, the entire purpose of the pressure switch is to ensure that the inducer fan is working properly. In Nov of 2016 a licensed technician replaced the inducer motor. . This is a safety precaution to ensure that gas will not enter the furnace unless the toxic fumes within the burner assembly can be exhausted. This means that a pressure switch rated at 0.80" will not close until approximately 0.95" of pressure is applied. First, that the inducer motor is operational and not failed (inducer wheel broken, etc.). Water in the vent due to a sag in the piping . When the exhaust or the intake is blocked, the inducer fan doesn't create negative pressure so that the pressure switch will stay open. This switch is set to close at -1.50. The air switch checks your draft inducer motor to ensure it's working correctly, and then it closes, i.e., turns on. . (4) a dirty or stopped updraft inducer. Draft Inducer not producing enough Vacuum to make the pressure switch Model Keeprite NTGM100EHA3 Here it goes, The Home owner (My friends father in law) heard a noise coming out of the furnace and took the cover off and figured it was coming from the Draft Inducer. Alot of the time the pressure switch tube or the hole it connects to on the fan is clogged. Upvote #9 12-12-10, 07:53 AM A . jadnashua said: The pressure switch appears to be working if you can force it to work. New New New. your furnace does have a pressure issue, but it's not the pressure switch causing it. When I turn it on, the inducer motor will start spinning and shut down immediately, the board will reset, and try again in about 30 seconds. There isn't much volume in the line to the bladder, so you should not get a continuous stream of air - the switch has a rubber bladder that flexes, that is attached to the switch. Only OEM pressure switches should be used. Shop by category. The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper air flow. If the draft inducer fan motor . If the pressure switch is not closing when the inducer is ON then you might have a bad pressure switch or any of the other problems that are mentioned in this post that can cause pressure switch problems. If the inducer motor will not come on it could be the thermostat not allowing the furnace to start. I'd start be using an AC voltmeter to verify that you have 24 VAC at the W terminal when the inducer motor isn't starting. If the inducer motor in your furnace is not starting, then the pressure switch won't close. . Furnace model: Carrier 58STA110 . Pressure switches have a 'closing pressure' - not listed on the switch body, but equal to about 0.15" greater than the pressure stated on the switch. On the collection chamber, check to see if the port itself is clear of any calcium deposits, dirt, or other debris that would prevent air from flowing through the port. Blocked Vent; Undersized Vent; Water in Pressure Switch Tubing; Cracked Pressure Switch Tubing; Inducer Not Running or Not Running to Full Speed The pressure switch is a built-in feature that has to supervise the inducer motor's negative pressure.
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