Probe one lead of the pressure with one lead of your meter while touching the other lead of your meter to the ground. Should the hi pressure switch be tested the same as the lo? I then; 2515010 INNER BLOWER DOOR 21″ OBSOLETE I purchased a Fasco replacement from a reputable parts supply store. If i disconnect the line with the positive pressure, the pressure switch shuts off, but with the disconnected tube it works fine. Hi Paul! When the pressure switch opens the gas valve closes and the furnace starts another ignition cycle because the pressure switch closed after that 1/2 second glitch. What could that be? I discommect the tube from the nipple on the inducer motor and the inducer motor starts to run, i plug the tube back in and the system works as expected. https://www.tool.report/types/power-drills/. We would love to help you out and earn your business! How to Know Your HVAC Ignitor Has Gone Bad. Steve. B1370819 DOOR SWITCH F From disconnected power, after the blower cycle, I get error code 31 – the dreaded pressure switch fault. After I cleaned the sensor the furnace worked, but as soon as I put the burner box cover back on it it began cycling again and burners would not stay lit. I sent you links on our site where you can purchase the parts. Tracked down the service manual/parts list for this model and found the pressure switch on eBay and bought it just in case. I hope you have a great day! Steve. I am so grateful to you for taking the time to help others who might experience the same problem you did with your furnace! 764741 BLWR BLK-OFF,10X10. I cant find the minimum rating so that it actually opens up, and when I tested it was only about 1.1wc. One question that I would ask would be is the pressure switch actually opening up and breaking the circuit during a heating cycle? I will start by saying that if you turn the power switch off on the side of your furnace then turn the power back on it is normal for the furnace to run for a minute or 2 to get rid of any heat that is stored in the furnace in case of a power failure. It should be clear. How can I check that? 20 Its reading .38-.46 in-wg. Hi! Our email address is. A pressure switch is a pretty simple component. I set the temperature back at night to 65 degrees and in the morning has a call for heat, the inducer motor starts, the igniter glows and the furnace fires.. If you've taken a few minutes to rule these things out and still have a problem then we can confirm the switch is bad by testing the circuit with a voltmeter and maybe get the unit working temporarily for a little heat at least. If I unplug the tube and the cap, water will run out of there, quite a bit. I am glad that you found a solution to the problem right now. Hi Alex! Sorry to hear that you are having trouble with your pressure switch not closing. It is best to hire a professional once you detect any of the faulty AC pressure switch symptoms. Thank you in advance, in Michigan, kind of cold out. Please email us anytime if you have any questions. If so, see if you can remove it. If the drain line becomes clogged, the water will build-up in the furnace and eventually cause a pressure switch fault. B2589342 #42 ORIFICE It appears the pressure switch is working ok… both terminals have 26 volts (when grounded) past the point where the draft inducer shuts off, only closing once the motor slows a bit. I have a Weil-McLain GV-6 and I just tried firing it up for the first time this year. While the furnace is turned off check all wire connections and grounds to make sure they are good and tight. You should start with checking those things since they are the easiest, don't require special tools, and cost nothing. We sell furnace parts, air conditioning parts, AprilAire filters, EZ Flex filters, and many other HVAC parts and supplies at affordable prices. I would suggest making sure that both ports where the pressure switches hook up are clear and open. Based on the size of the unit (meaning heat output capability, not the physical dimensions) the amount of suction the pressure switch requires to work will vary. 0130F00010 FLAME SENSOR F I was just wondering if you have encountered any problems like this. Great last name! This year it doesn’t seem to last longer then a day ( sucks waking up in a 15C house hold). Should there be 27VAC and then 0V across the terminals? This sounds like you have tried just about everything to find and fix the problem. I hope you can easily find and fix this problem. I am sorry, but I do not know what the acceptable measurements for CO in the exhaust of a 92% furnace. Please make sure the vent pipe is not obstructed. A hole in the heat exchanger will not allow the draft inducer to create enough draft (negative pressure) to close the pressure switch. I hope that you continue to have good luck with your fix. Yes, that is not normal for the pressure switch to not get 24 volts AC between each terminal to ground when the draft inducer is running. I would like to suggest that you take the pressure switch tubing off the pressure switch and take a wet vac and make sure that your condensate line and everything is clean. Make sure the batteries are in good condition if your thermostat uses batteries. Make sure you return registers/grills and supply registers are all open and unobstructed. Also, the controller (White-Rodgers 50A51-507) sometimes blinks 3x showing a pressure sensor problem, and sometimes shows solid red (failed controller). My need is due to the fact that I have had so many licensed and qualified professionals come, replace parts, charge rather large fess to no avail. On most furnaces you would get a “pressure switch stuck closed” fault on the control board. I really appreciate your help on this. Voltmeter showing resistance meaning our pressure switch is closed and since there is no vacuum, it shouldn't be and therefore has shorted. I have seen the white plastic Molex connections that plugin where the plugins do not mate properly and cause poor connections with arcing. Thanks! Do you look for Sponsored/Guest Posts to drive traffic to your client's website or personal site? The installer did not go back to 2″ before exiting the building. if this is switch problem , can we put a compatable switch old part # is fs 5070-52. I checked the tube connected to the pressure switch and draft inducer, which is completely clear. National Energy and Supply. You might have to attach a tube to the draft inducer so you can pour water into it. The system only functions if the top access door is off the unit. Yes, sounds like the pressure switch is sticking closed because when you take the wire off one of the terminals on the pressure switch this opens the circuit and allows the furnace to start the heating cycle. As I am sure that you know the secondary heat exchanger is like a radiator and can become plugged up with debris rust and water. I took out the condensate trap and rinsed it out – I can run a good stream of water into any of the 3 input lines and water flows out of the trap w/o issues. I’m trying to fix my AS Freedom 80 (model AUD080R9V3H1) and it looks about identical to the furnace he’s demonstrating on in World of Advice. The combustion pipe ends with a 45º elbow. Steve, Thanks for the quick reply Steve. There was no discernible movement in the gauge needle, but I could hear the pressure switch click closed. I have a Goodman GKS91155DXAF. When I have the high side hose off it works the furnace fires up but when I got the both hose off it gives me error 229 ignition on high fire. I looked it up in our York parts program and your furnace uses pressure switch part number: S1-02435261000. I would suggest taking the pressure switch tube off so that it does not damage the new pressure switch and use a wet vac on the furnace’s condensate trap and line to make sure that the condensate line is not partially stopped up. Once I take a wire off the pressure switch, the air inducer starts. When that fan comes on it will pull a vacuum inside the pressure switch through that rubber tube you see connecting the two which then pulls the switch in an closes (connects) the circuit to allow power to pass to the next component which is the igniter. If your still not sure what's going on then I recommend you contact a technician. That is the only thing that I can think of that might cause the problem you describe. I have a furnace that starts the heat cycle without any issues. Is it possible the wire is bad and if so, is it possible to change only the one wire or does the entire harness assembly need to be changed? Replaces parts HQ1008819TA, 1008819, 1170847, 1010895, HQ1010895TR, Tridelta FS6285-1640 & PPS10009-2174 It seems to coincide with my constant resetting to evaluate the symptoms. When it doesn’t, I hear one click only. Hi Rev John! This a case of low negative pressure at the draft inducer, that is not caused by a drainage or venting problem, or by defecting hoses to and from the pressure switch. To find a replacement you will likely have to do one of two things: contact the contractor supply house that sells your brand of furnace or obtain a universal replacement from a contractor supply house or online. Nordyne m1mb 077a aw Light shows Pressure Switch Open Tried so far: checked pressure switch tubes for connectivity and cracks (ok) Removed exhaust fan to ensure both motors are spinning (ok) Removed exhaust tube and confirmed no blockage (ok) Cleaned flow probes (ok) Reassembled all, furnace ran for about 5 minutes and then shut down the the pressure switch … HI-111C HOMEOWNER INSTRUCTIONS (ALL MO S OBSOLETE 2512006P CONTROL ACCESS DOOR 21″ OBSOLETE However, when the inducer turns on, it does not pull enough vacuum to pop the pressure switch. The furnace will lock out for one hour and then restart.”. Do not use a vac with the pressure switch connected or it could damage the pressure switch. Lack of maintenance Dirty filters Wear and tear Electric Ignition or pilot control problems Malfunctioning thermostat The … I teed into the hose that goes from the port on the draft inducer to the pressure switch with a Bourdon style vacuum/pressure gauge, the kind sold in auto parts stores (don’t yet have a manometer, it’s in the mail). This 1 to 2 minute run time is built into the board and is normal. I’m assuming this is why the hot surface igniter isn’t getting a signal to turn on. Once I disconnect the wiring to the pressure switch (and immediately reconnect it), that code stops blinking, the igniter starts, the natural gas comes through and we have heat. Steve. Most of the time the vent pipe being stopped up is not the problem. I would like to suggest that you disconnect the pressure switch tubing and clean the condensate drain on your furnace to make sure the drain system on your furnace is clean. If the gas burners start off burning properly and then after 30 seconds or so start to burn back (flame gets shorter) then if the burner almost goes out altogether then this is a sure sign that your heat exchanger is stopped up. Thanks. I have a 28 year old Rheem (unit#2) RGVC 07EA – ER that is making me batty. 2521303S SUB-ASSY, HEAT EXCHANGER 5 CL Please let me know when you find the problem so I can share it with others. Look for any blockage in the flue you can see. I am guessing that after 10 to 15 minutes of run time the heat builds up enough in the furnace to cut the furnace off on limit. Any help is appreciated. This water must be drained out of and away from the furnace. By the way unit one is running find thanks for all the tips. If you would like for me to look up any parts for your furnace then please send me your furnace’s model number to our email address [email protected]. Steve. Next day, same problem and fixed the same way again. diaphragm; Holes, tears, or other damage to the diaphragm; Dust or dirt buildup Hope you have a great day and week! On most limits, you should get 24 volts from each of the two wires on the limit to a good ground. I’ve tested that voltage at the switch and also down at the controller connector. I was taught the old method of mouth to tube and suck lightly to close the PS switch. God bless you and your family. Thanks for sharing! Though these are valid suspicions of the failure cause, there is one that is often overlooked because it's not understood: the pressure switch. Rev J You could have a bad, dragging, dirty, or slow running draft inducer. It sounds like it could either be the control board or gas valve. Please send your Kenmore furnace model number to me at our [email protected] address and I will try and look it up and see which pressure switch is used on your furnace. I cannot get the code to default when the induction cover is removed from the furnace. so, I can help you. Should I read the temperature on it with a TC? does it mean plugged up? B1401018S IGNITOR F I would think that you either have an open safety control like a limit or rollout switch, a loose connection in the wires or a faulty control board. However, when the blower motor kicks on, the pressure switch temporarily opens and of course the burners drop out. I blow air to those holes and from the tube to draft inducer, they don’t seem to be blocked but I hear water sometimes stays in draft inducer but not always. Question: How can I test to see if a pressure switch is operating properly? Sorry that I can not be much help. Hi! Yes, more than likely you got a bad pressure switch. The gas valve will not open if the pressure switch doesn't work so the "click" sound of the gas valve opening tells us that the pressure switch is fine and the igniter is likely our problem since we should also notice it didn't try and light just prior to the "click" we heard. May be it is worthwhile just swapping out the pressure switch and the board, like you said. One of them is refusing to turn on. Hi Tim! I hope you have a great day! You can. Sorry I'm not of much help. Now if i jump them obviously thats giving me one reading for both wires so thats not 100% accurate measuring. Year old Lenox unit. Let's take a closer look at this part; what it does, how it works, and what the purpose of it is so that if your furnace ever fails to light you might be able to figure out if the pressure switch is your problem and what you can do to fix it. I am interested to know what you find the problem is. By launching your own Sponsored/Guest Post campaign, you’re positioning your brand to stand out in a crowd of competitors. I cut the 1 inch PVC condensate drain line where it enters the condensate drain pump so that the bottom of the drain line is never below the water in the pump well. Please make sure that all wires, especially the ground wires are good and tight. But when talking about high and low pressure switches it typically has to do with the number of stages a unit can operate in. The kicker is it doesn’t always do it. That was not fun! I released the switch then pressed the switch again and this time the furnace went back to working properly. Hi Gene! 1284835 CAPACITOR STRAP If you aren’t then you might have a contact in the control board that is arcing, getting weak and causing a voltage drop. I have an 80% efficiency unit. After 2 tries, I get the error code “External lockout (retries or recycles exceeded)”.
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