It kicks on. Hey, so pancake dual 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. How to Know Your HVAC Ignitor Has Gone Bad. If I remove the wires from pressure sensor and wait til inducer starts up and than jump the wires for the pressure sensor the furnace works perfectly. Get 3 blinks indicating the switch is stuck open. Rev J You could have a bad, dragging, dirty, or slow running draft inducer. If there were underlying issues such as obstructions, condensation line blockage, etc., would the furnace even run properly after a new pressure switch was installed? As we start the heating season, we already have been getting questions about the vent pressure switches in furnaces. You hit the nail on the head. Classic Rheem 90 upflow. I get 24Vs to the white wire on the PS but the black wire, that goes from the PS to the Honeywell S86F controller, reminds without power so no ignition. About the only thing that I can guess would be that the secondary heat exchanger is partially stopped up and you probably either need a new secondary heat exchanger or a new furnace. I did take out the blower fan and crawled inside and looked up and saw 0 signs of brown or white residues. Now previous I was able to do a com24/test to test the motor and ignitor. Guess what I am asking is more likely than not, I probably got a bad switch the first time it was replaced if it only lasted a couple of months, or, could there be another problem that would cause the switch to go out so quickly? Intake and outflow PVC pipes are unobstructed and I can feel air coming into the housing from the intake and have exhaust departing the out flow line. We sell furnace parts, air conditioning parts, AprilAire filters, EZ Flex filters, and many other HVAC parts and supplies at affordable prices. 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. When I take the top half off it has a lot of water just sitting there. Please send me your furnace’s model number to our email address at arnoldservice@gmail.com. A stopped up condensate drain and heat exchanger can cause the pressure switch to open up as you described. does it mean plugged up? The tube that runs from your pressure switch to the draft inducer could be plugged up. Steve. However, when the temperature in the room drops again, the same pressure switch code starts blinking, and the only way I can get the heat to kick on again is if I disconnect the wiring to the pressure switch. Best of luck. You should get a constant 24 volts between each of the two terminals of the pressure switch to a good ground on the furnace. I would suggest making sure the batteries (if you have batteries in your thermostat) make sure they are good. If i suck on the hose, it closes, glow coil glows, and igniter ignites. I hope you can get it fixed inexpensively. And, lastly, once I take the cover off the furnace, I find that the housing around the limit switch is fairly hot to touch. I would suggest that you try to fix what is causing the furnace to stop when you install the burner box cover. Any suggestions? 2568410 WIRE HARNESS, BLOWER 2578402S It sounds like it could either be the control board or gas valve. I hope you can find and fix the problem soon! The old one was squeaky and then quit (lots of rust and corrosion). Furnace Pressure Switch Testing. I would suggest making sure that the draft inducer is tight against the body of your furnace. I hope you find a simple and inexpensive fix. And one more problem, my thermostat connected to this problem furnace seems starting to call heat way early than it should be, like reaching the designated temperature two hours early, like I set temperature to be 68 at 7 am, it’s already there by 5. If you forgot you probably ruined the new pressure switch. You should be getting 24 to 28 volts from each terminal on the limit to a good ground. I hope you can find and fix the problem soon! This can damage the pressure switch too. Do you know how I can further diagnose if this is truly a pressure switch problem or a problem with the control board (or something else)? Please see the picture I copied from our parts program on the following page: https://arnoldservice.com/wp-content/uploads/2020/12/Trane-furnace-parts-AUD080R9V3H1.jpg I am sorry we do not stock that control board kit. If you would like for me to find out which control board or pressure switch your furnace uses then please send me your furnace’s product number to our email address: arnoldservice@gmail.com and I will look up the parts and show you the pictures of the part numbers. Hi Steve. I pulled the burner chamber door off during a heat cycle and the same 4 glitch pressure switch openings happen. 1370911S PRIMARY LIMIT SWITCH 220ºF F In the description is says, “SWITCH,PRES,AIR,1.00 ON FALL,SPNO”. Hi Ricardo! Sorry that I can not be much help. I am sorry that I do not know much about Lennox rooftop equipment. 2) is this likely a pressure switch issue? Teresa, Hi Teresa! HI-111C HOMEOWNER INSTRUCTIONS (ALL MO S OBSOLETE I know those pressure switches are not cheap! 2513003 BURNER BOX TOP 5 CELL OBSOLETE Replaced the flame sensor – it didn’t fix the problem (and it is very difficult to access on this unit). This has me stumped. Steve. After ordering a replacement part I was looking at some more websites on the vacuum (flow) sensors and found your website. We checked the thermostat which was fine and changed the thermoregulatory. Even disconnecting the intake gives same error code 31. Is my vent pipe blocked? B1370155 AUXILIARY LIMIT SWITCH 1200 2510002S FLUE COLLECTOR BOX 21″ I released the switch then pressed the switch again and this time the furnace went back to working properly. Steve. To day I found a double trap condition caused by the condensate drain line being too deep in the well of the condensate pump. 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. From the things I’ve read, the blower shouldn’t start before the draft inducer. It sounds like you pretty much covered all the bases for troubleshooting. I have an older Payne 373LAV036070 that is having problems starting and staying on in the case it does start. God bless you. If you are not getting 24 volts between these two wires then you have a thermostat or thermostat wiring problem. These are nice because they can handle single stage and dual stage units as well as be set to various pressures. I sent you links on our site where you can purchase the parts. A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced-air furnace. Hi Steve! This sounds like you need a new pressure switch. The manually re-settable switches don’t appear to have triggered. The table above gives you quite a few causes of pressure switch failure that are easily confirmed or eliminated as the problem either audibly or visually. Hi RD! Could a new inducer motor impact the pressure switches (pressure switch 42-24195-03 and air pressure switch 42-24012-05). Please make sure the draft inducer is fastened tight to the furnace body. The furnace has not missed a lick since. Do you have any recommendations on how one might go about removing and cleaning this tube? It is there to confirm the unit is drafting properly. 2568411 WIRE HARNESS, HEAT EXCHANGER 2578402S Thanks again and wishing you a very happy and successful new year! If the pressure switch tube has water in it then this is a sign that your condensate drain line could be stopped up or not draining properly. I believe you have a boiler here and I am unfortunately not as well versed in those as I am forced air systems. I really appreciate it! Thing is it’s done this the last couple years and it’s alwAys started early spring/ late fall but usually after removing the tube mentioned above once or twice it works like 100% normal until the next seasonal change. Ive owned this house for 10 years and every so often I have had to repair my furance, and this is the only time I’m beyond lost as whats causing the issue. Hi Steve. Love love this video! Honeywell part #: 49L9001. Original Inducer fan was old and rusty but it wasn’t out. 80 afue. Yes, sounds like it could be the pressure switch sticking ever once in a while. Steve. That could be your problem. I am not familiar with Clare Megasave furnaces. This is probably where the problem is. There is some buzzing from the controller that seems to coincide with the call for heat. Voltmeter showing resistance meaning our pressure switch is closed and since there is no vacuum, it shouldn't be and therefore has shorted. Check the draft inducer screws that secure the draft inducer to the body of the furnace to make sure they are good and tight. I hope you can get the furnace fixed soon! B1282628 GAS VALVE (36G) F B1282628S The pressure switch reads: Much appreciate your time and timely help. Steve. I hope you have a great day and weekend! Something is cutting the burners off and you will need to find it. IO-605 LIGHTING INSTRUCTIONS, W/36G S I hope you have a great day! 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. Also, the controller (White-Rodgers 50A51-507) sometimes blinks 3x showing a pressure sensor problem, and sometimes shows solid red (failed controller). Hi Steve. Dan, thanks for this article. A pressure switch is a pretty simple component. I jump the switch and the furnace works. I would suggest that you make sure that you do not have any leaks in the burner cover ignitor wires or anywhere there is an opening into the combustion chamber. Hi Hugh! I hope you can easily find and fix the problem. Steve, Thanks for the quick reply Steve. I dont know if this would cause corrosion or sticking inside of the pressure switch. Maybe someone reading this can be of more help I hope. 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. I would be interested in seeing how your gas burners are burning when you by-pass the pressure switch. Thanks again. I am waiting for your reply. It should also be noted that furnaces can trigger a pressure switch fault even if the switch is not bad. You should get a constant 24 to 28 volts AC from the thermostat between these two terminals on your control board. Steve, Total: 45 Model#: GPD125-4 Mfg#: GPD125-4 I am sorry, but I do not have a Therma Pride parts program where I can look up parts for you. Thanks! 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