I was working on a Trane unit model number TUH2B080A9V3VA, and the hot surface igniter is not glowing. What do you think is wrong. The igniter is brand new and reads about 17 ohms when checked across its terminals (ohm reading is correct for this igniter unit). You would turn the furnace on so the thermostat is calling for heat and set your voltmeter to “Volts AC” Touch one terminal of the rollout switch with one of the meter probes and the other meter probe to a good furnace ground like on the body of the furnace. If your furnace is going off on limit I would suggest making sure that the blower motor capacitor is in good condition, make sure that your evaporator AC coil is not stopped up on the underside, make sure that your gas valve pressure is adjusted properly to produce the furnace recommended temperature rise. Sorry that your heat is out during this cold spell! Please see the pictures below to help identify the difference between a flame sensor and a furnace hot surface ignitor. Also the blower was still running which I thought without a flame the flame sensor would turn the furnace off. If you are not getting a minimum of 110 volts to the ignitor then you probably need a new control board. Why is it that this unit has used 4 high limit switches….a safety device…each time getting this heating unit to work for 2-3 days, each time. Why would i not be getting the vacuum to close the pressure switch? I decided to disconnect the plug from the IFC to see if I was getting any power, and when I turned on the furnace and checked, I got nothing. The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. Here is the link to that page: https://arnoldservice.com/how-to-test-and-troubleshoot-gas-furnace-pressure-switches/ Steve, Hi. My furnace is not performing the igniting sequence (3 cycles of igniting followed by inductor blowing and then lockout in case igniter does not glow). Sorry to hear your heat is out. If the furnace is experiencing problems that could result in a fire, it may fail to ignite properly. If it seems like the gas line is not the issue and the gas is flowing to other appliances, check to make sure the gas supply to the furnace itself is open and clear. Where would you start replacing parts or would you troubleshoot further. The furnace had worked fine an hour before I started this cleaning job. If you do it can shorten the hot surface ignitor’s life. I am guessing that when the load of the ignitor is applied that the contacts inside the ignitor relay on the control board are pitted and bad thus the ignitor can not get enough current to glow. If you find that your furnace is not igniting at a time when you need it most, try these easy fixes first in an attempt to get your heating system up and running in a short amount of time as possible. Turning the power to the furnace off and on will usually get the heat to cycle on normally. My Keeprite furnace turns on for a minute or so and then turns off. Make sure all registers are open and unobstructed. I’m just worried about if its a gas issue. I would like to suggest that you find out why your furnace is overheating and that should solve the problem with the limits going out so often. Steve, I ran out of propane, got it filled up and went to start the furnace it ignited, and wouldnt ignite back. The limit should really never be used unless your furnace has a part failure like the blower motor stops, a dirty filter, or if the underside of the AC evaporator coil is stopped up and not allowing air to be expelled through the furnace. The fan motor comes on immediately instead of the system going thru the normal process. If you are not getting 110 to the ignitor then I would think that you have a control board problem and might need a new control board. The ignitor was going off and on during warm up. At least I eliminated the fuse factor. It had no power at that time too. When it would light, it’d stay on for perhaps 2 or 3 mins, then cut out. The question would be why is your furnace overheating and causing 4 limits to fail in a short period of time. If the ignitor is staying on then you probably have a stuck relay on the control board. All that I can think of would be to test the voltage when the ignitor is being energized to see if the control board ignitor relay is failing or not. When I look through the view port during one of these failed cycles I see the igniter glow for a couple of seconds and then go off. keeprite furnace codes If you’re looking for help fixing your Keeprite furnace, ... Failure to ignite or the flame sensor was lost while running FIX: Check for: ... control won’t auto-reset FIX: Check for a miswired gas valve or a defective control valve. I would make sure that you are getting 24 volts AC between W and C (common) when your thermostat is calling for heat to be ON. Thanks! One of the most common reports homeowners have when their furnace will not ignite is the clicking sound of the furnace about to come on, but then silence and no heat. We offer same-day shipping on most products, so you won’t have to do without the goods you need for long. 3. Remember each time, a new limit switch solves the problem for 3 weeks. Hi Shawn! It all started after we switched propane companies and replaced tanks. We have a furnace troubleshooting flow chart: https://arnoldservice.com/furnace-trouble-shooting-flow-chart/ and many questions with answers and videos on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ I hope you can easily find and fix the problem. Our furnace went out at -31 here in Wisconsin…luckily we also have a wood stove. Steve. Any input or advise will be highly appreciated. The top YouTube Video shows how to replace your furnace ignitor and flame sensor: The YouTube Video below shows you how to test a furnace hot surface ignitor. Your email address will not be published. I’m trying to fix a Trane furnace (sorry I don’t have the model number) with a White Rodgers 50A50-571 Control Board. Blower does not run in on position. When i look in the glass to see what the indicator lights are doing I see rapid alternating flashes. Can’t figure out if it’s the igniter/sensor assembly or gas valve. You should have between 110 and 125 volts AC. Noticed ignitor begins to glow for a few seconds and stops and about a minute later attempts to get warm again. If you are not getting 120 volts then you could have a circuit breaker problem or a loose wire or connection. Most homeowners have a forced air gas furnace, which is what we will be troubleshooting in this blog. I’ve replaced the ignitor and pressure switch – still nothing. The furnace hot surface ignitor does not glow. The problem could be coming from the control board or any of the safety controls (pressure switch, limit or rollout switch). Modern gas- or oil-fired furnaces have several safety sensors that check on furnace operation. A faulty or dirty ignition or sensor is a relatively easy fix, so follow these steps, and you may be able to solve the problem yourself. Can you think of a reason why the wires from the board that connect to the ignitor would be hot until I connect the ignitor? The gas heat should come on by joining the red and white wires together. I am sure that it wasn’t cheap! Our comprehensive Keeprite Furnace error code guide will explain common issues, provide tips, and show you how to read your model's error codes. The question is why did your furnace breaker go out. It is about 6 years old and I have a continuous orange blinking light. This … Hi Dustin! I hope you can easily find and fix the problem. You can do all kinds of tests using a volt and ohm meter to make sure that you do not waste your money on a control board. Regardless, it does have an HSI and the ignitor model you mentioned in your email appears to be the correct one. If you use a wet vac to clean the drain on the furnace please make sure the pressure switch is disconnected so the negative pressure from the vac does not damage the pressure switch. There is not really a way that I know to determine how long an ignitor will last. Most furnaces have safety door switches. 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Inside the unit is extra clean, as was filter. When I woke up this morning I noticed that the t-stat was below the heat temp. Adjust the thermostat approximately 3 to 5 degrees above the room's current temperature to check if the heat comes on. It may take a few minutes to start running even after being lit, so be patient. I have no idea why they would not sell ignitors other than because they are fragile and can be broken easy and if a customer does not know how to handle an ignitor properly without touching the carbide tip then this could cause lots of warranty problems for Lowes and Home Depot. If your hot surface iginitor only reads 15 ohms does this mean the hot surface iginitor has any continuity how long will that last before I have to replace that ? Most electric motors, including the furnace blower motor, have a reset switch that pops up when this happens. The ignitor did not glow, the flame sensor (a small metal probe about 1/8″ in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Read More. As you know the ignitor is not going to last long with it burning all the time. Where you stop getting the 24 volts is where the problem is located. First, you need to turn off the gas to the furnace. If this does not solve the problem, you may need to hire a professional company to clean your air ducts if airflow is still obstructed. I would make sure the gas valve pressure is right first. We have processed over 25,000 Successful PayPal Orders! But what I noticed next was that it stayed on the entire time the furnace was lit. What to Do When a Furnace Blower Fan Won't Start Written by Doityourself Staff. Hi Ron! Installed a new igniter and have the same problem, the igniter will not glow all the times, it works on an intermittent basis. Maybe some ice got into the vent pipe or the combustion air vent pipe. 3 blinks on a Goodman furnace usually mean a pressure switch problem. “G5UH” does not show any Lennox furnace models in our Lennox parts program. I would also suggest that if you have a fuse on the control board or transformer that you check the fuse out to make sure it is good. This video shows how I fixed my LENNOX FURNACE that did not want to start (burners failed to ignite error). There is a power disconnect switch by the furnace. I am sure you have probably already checked the pressure switch. After 3 times the furnace goes into lockout, and the only way to get it out of lockout is to turn the power switch off and on. Voltage at the ignitor is 10-12V AC. The hot surface igniter (1111701 or White Rogers 768A-2) on my Amana gas furnace will not glow. Arnold’s Service Company, Inc. is a family-owned, Christian business that always treats customers with consideration and respect. The furnace gas valve for this type of furnace is identifiable with its solenoid designations: MV (main valve), PV (pilot valve), and PV/MV (common). Some rollouts have buttons on them that you can push in to reset. All I had to do was reset the limit switch. URGENT. This is a big mystery to me. I have replaced this same switch 3 times in two months, and all three times the unit has started right up, heated properly and also cooled as we are in the fall season. The control board’s LED is steady on. If all the safety controls check out OK (closed) then you probably have a bad ignitor relay on the control board and you will need a new control board. You can bypass the thermostat by turning the power off to the furnace then joining the R and W wires together with tape or twist them together. When a furnace has a bad ignitor. Thanks. Sorry that I can not be of more help or give you any other advice. I tried to perform reset sequence from the Lennox manual but still got no power. Whether you need furnace ignitors, AprilAire filters, EZ Flex filters, or another kind of HVAC merchandise, we want to serve you. I checked the voltage to the plug connection and it reads 116 volts once the inducer fan and pressure switches are activated. Check the display and see if it tells you what the problem is. Steve, I have a luxaire furnace model #g9t06010upb13c that keeps burning out ignitors continuously. Sure enough this time the igniter lit up and lit the furnace on its own. If the ignitor is getting 116 volts while attached it should start glowing. On the bottom is a picture of a hot surface ignitor. I have a Heil furnace, model NUG5150BKB2. We have a pretty good trouble shooting flow chart and what to look for on our Furnace Troubleshooting Simplified page. Yes, if your furnace is only producing 80 volts then it could be a problem with the ignitor module. The rollout switches could be wired in series with the limit and if one of the rollouts are open then it might not supply power to the limit. I have not found a furnace that has stumped me yet. Does this sound like an ignitor going bad? If all these check out OK then I would think that your control board could be at fault. Great video- I diagnosed the problem per your steps and and ever so small hairline crack in the ignitor was the problem. Awesome! I have a Carrier 58MCA/58MXA, not sure which but that’s the manual that was left when the house was built. I hope you can easily find and fix the problem. The furnace will come on (humming noise) but the pilot light won't ignite (no heat). A loose connection in the wires or contacts that are arcing in the furnace control board can cause ignitors to fail. It was trying to start over and over, but almost never would ignite (I say “almost” because occasionally it actually it would – maybe once in 30 to 40 attempts). Weather changed, set t-stat, inducer started, no ignition. I would check to make sure that you have all wire connections and plugin connections are good and tight. I had the ignition switch replaced and went to bed happy that it was working. Steve, Hi I’m having a problem where the igniter glows but on some occassions doesn’t create the flame.. the glow vanishes and the furnace will blow normal air until it is reset. The safety controls would be the limit, rollouts and pressure switch. It shows no power at all. The longevity is like a light bulb, very hard to determine. The problem could be caused by an open safety control like a limit, roll-out switch or pressure switch not being closed. I hate to buy another part and try to hook up a new control unit if it’s not going to solve the problem, but I’m considering it. If you would like for me to look up parts or give you the control board part number then please send me your furnace’s product number to our email address: firstname.lastname@example.org. Tracked it down from the draft inducer pressure switch to the limit switch on the blower. Steve Arnold, https://arnoldserv.wpengine.com, Your email address will not be published. One of the most common reports homeowners have when their furnace will not ignite is the clicking sound of the furnace about to come on, but then silence and no heat. So sorry to hear that you are having a problem with your furnace! Thank you, Hi Mauro! The electronic ignition system has broken. If I light it manually, it runs normally until the thermostat turns it off, but of course it will later attempt to re-light and then the ignitor will fail to heat up, and it’ll shut itself down. Hi Robert! You can use an ohm meter to check the ignitor to make sure it is good. Thanks much, Steve! Ran for like 5 mins and I could hear the flame go out. Steve, Steve, My problem is similar but I do not appear to be getting pressure thru the hose system to the pressure switch. Not sure how fast it should go though. on Feb 23, 2010. Sorry to hear that you are having furnace problems. Best of luck in finding the problem. Is this likely to mean I need a new control board? RV Furnace Won’t Ignite This is a fairly common problem every RVer faces. If any of the safety controls like the limit, rollouts or pressure switch is open then the ignitor will not glow. I do not think that I would be stumped if I was able to trace down with a voltmeter why your furnace will not run. Most of the time the blink code key is located on the furnace’s blower door or cabinet door. When a furnace has a bad ignitor. Thank you much in advance! I have a problem. If you have determined it is not one of these problems, or you know that it is the motor or wiring causing the issue, you should call a. click on the button below to schedule a service today. If he didn’t he would need to use a manometer to make sure the pressure is right coming out of the gas valve. In the last 5 years I have had 3 new igniters with 3 different companies. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you can try to clean your flame sensor with light sand paper (emery cloth) or steel wool. I hope you can easily find and fix the problem. Set the thermostat to "heat" and set the fan to "auto." I am getting a fault 34. Even if you have a gas system, it uses electricity and must be turned on. The ignitor works and it starts up but no gas is getting through. The gas valve opens then after 3 resets it goes into a lockout with no error code. If they’re okay, I should have a new board by Thursday morning. I did notice a steady red light on the control board. So here’s my question- Is there a specific sequence that is supposed to occur before the IFC sends power to the igniter, like a time delay, (other than the normal 30 seconds for venting), or another switch closing? Hi Lawrence! I have a Lennox G5UH. We would love to have your business! Hi Rich! I am guessing at this point it might be the circuit board, is that a good assumption? Sorry that I could not tell you anything more than what you already know. I hope you can easily find and fix the problem. If an ignitor is bad will the furnace be shut down completely? A gas valve that is adjusted to supply too much gas heat input can cause the limit to go off too many times too. If your Goodman furnace won’t ignite, it could be caused by a major obstruction in the air intake system. I tested the pressure switch today and it is good. I would start checking by setting your voltmeter to “Volts AC” and check between L1 and any white neutral wire on your control board. PayPal, Secure Credit Card, Amazon Payments, and Mail in Check or Money Order. Please make sure all your wire connections are good and tight, test the ignitor to make sure it is good with an ohmmeter (40 to 90 ohms), make sure your safety controls are all closed. If routine filter changes have not been completed and your vents and registers are completely clogged, this can greatly impair the furnace's air flow. It was really easy. This time it does get a little warmer, but only a 1/4 of the ignitor is orange. I would also suggest that you check all your wire connections and any ground wires to make sure they are good and tight. My repair man cannot find the problem – the board is reporting a fault when the furnace is in the failed state but replacing the board did not correct the problem. Hey all, having an issue with my Tempstar 80afue, propane furnace. Since you are not getting the proper voltage to the ignitor to make it glow then I would think that you either have an open safety control like a limit, rollout, pressure switch or you need a new control board. If the sensor or ignitor is dirty, it will need to be cleaned. Steve, I have a furnace. Thanks! I hope you can easily find and fix the problem. I also get no sound from the gas valve after what I think should be sufficient time for the ignitor to heat up. Please click here to go to our furnace limits and rollouts page. Furnace inducer fan runs but won't ignite. Our email is. - Furnace repair service heating installation HVAC ac repair heating rebate Hot Water Tanks, Boilers BC Furnace Vancouver Burnaby Surrey Coquitlam Richmond Skip to content Call Us Today (604) 704-0300 | Emergency Services | prompt service is our #1 commitment | email@example.com Thanks! After checking all the systems, I decided to look into the IFC. Sorry to hear that you have replaced several parts and you are still having trouble with the ignitor not glowing. First and foremost, verify that the gas is turned on. Please Click Here to see the name brand Furnace Ignitors. If these are all closed and you are not getting 110 volts to the ignitor it almost has to be the control board. I always recommend keeping a spare ignitor on hand in case your ignitor fails on a cold winter night or weekend. All of these can cause the furnace to overheat and go off on limit. Can I put a clamp-on meter to wires from valve to ignitor? I am sorry that I can not make a recommendation because it takes special tools to get the gas/air mixture right on an LP furnace. Many furnaces have status blink code lights on the control board. Great forum you have here and I can appreciate the help and advice you give out. The thermocouple needs to get hot first, but theoretically, your furnace should start to work now. It still wont glow. We sell furnace limits on the following page: The furnace’s control board might not be supplying the voltage to the ignitor. Put the front panel back on, turn on the gas, and then turn the furnace back on. It appears that it bypasses the igniting sequence all together. Let me know if you want me to look up parts. If all your safety controls are closed like the limit, rollouts, and pressure switch and the ignitor is not getting voltage then I would think that you have a control board problem. However, I am lost as to why the igniter will not glow upon furnace startup. This sounds like a control board problem, but you say that you replaced the board and it did not solve the problem. The 3amp fuse looked fine, didn’t see any burn mark on it when I took it out to check. You Can Search Our Site for More Troubleshooting Problems, Heating, Air Conditioning Parts and Supplies in the Google Seach box below. Like any electrical component, the igniter for a furnace can break. PROBLEM: Unit’s pressure switch didn’t open. If your furnace is not keeping your house at the temperature to which you set it, then you have a problem somewhere in your heating system. You might smell some gas. We sell furnace hot surface ignitors on the following page: If you do not visually see a crack in the ignitor, then I would suggest that you unplug the ignitor and take an ohm meter reading to see if the ignitor is burnt out. blower motor wheel is spotless. I would ohm out the ignitor and make sure it is between 40 and 90 ohms. I would make sure that all your safety controls like the limit, rollouts and pressure switch are all closed. Just to be safe before I purchased an expensive control board I would suggest trying a new ignitor. TIA, Hi Sean! Tested furnace all worked well. You can also check the breaker to make sure power to the furnace has not been tripped. I replaced the ignitor because it wouldn’t glow and was reading 90 ohms. Please follow the furnace troubleshooting flow chart that we have on the following page: https://arnoldservice.com/furnace-trouble-shooting-flow-chart/ I hope you can easily find and fix the problem. Minus 31 how awful! I’m having this same problem with a Goodman furnace. Thanks! If you would like for me to look up parts…please send your furnace’s model number and serial number to our firstname.lastname@example.org email address and I will be glad to look up the parts. If you would like for me to look up parts then please send me your furnace’s model number to our email address: email@example.com. Make sure that your pressure switch is staying closed. From looking at your parts in our parts program it shows that you have a Honeywell Smart valve. Draft inducer motor starts. Thanks! I had similar issues to the previous commenters. Problem: Draft inducer will not start, ignitor will not glow or gas valve will not open. Then the sequence starts all over again with no ignition of the gas. Remove the front panel and look for the ignitor/sensor. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. It would be best to send this information to our firstname.lastname@example.org email address. When you are finished, replace it exactly the way you found it. I have a Ruud furnace that isn’t igniting. A pressure switch that is not closing could also be the problem. Heater guy says its the pressure (propane company), propane guy says its ignition sensor or igniter, but the heater guy tests and says its okay. You should get 24 to 28 volts AC between each of the two terminals on the rollout or limit to ground. If so how many mA should it draw? I think the furnace guy was wrong and the propane company proved hes wrong and now I still dont have a furnace. I would suggest making sure that the limit, rollouts and pressure switch is closed when the draft inducer is on and when the thermostat is calling for heat to be ON. When it first started up the Igniter did nothing, so I assumed it might have gone bad. This sounds like it is a control board problem where the ignitor relay on the control board is not allowing the ignitor to glow every time. Set the multimeter so it can properly measure a resistance of 10 to 200 ohms. 919-480-2727 BOOK NOW. Thank you so very much for your kind words. I have a Goodman Furnace that a technician recently replaced the control board on 2 weeks ago. I assume that your draft inducer is running but the ignitor will not glow. If you are not getting 24 volts to the gas valve then you could have a bad control board or and open limit or rollout switch. Often, newer electronic thermostats will display an error code if something is wrong. We had furnace ignitor problem last night with our Bryant 90I furnace. Refer to your user manual to locate the ignitor. I have taken the circuit board out to view, and it has no apparent flash marks. It will not hurt anything to leave the combustion air vent pipe loose until it warms up. What steps should I take to properly diagnose the no power issue? At times, especially in the morning after allowing a temperature drop over night, the furnace will not function. Hi Mickey! I also checked continuity through the igniter by itself, and all the wires connected to it, all the way to the IFC mother board. 2. Make sure that you are getting a constant minimum of 24 volts between W and C when the thermostat is calling for heat. Steve. Steve. Problem: Furnace will not ignite the gas to produce heat for your home. Place your order today! I would like to suggest that you check to make sure the ignitor is shutting off after the furnace gas ignites. Thanks! Thank You Cosimo Roarco Have a nice day, Sorry to hear that your ignitor is going out often. Coronavirus Update: We care about your health and continue to service our customers safely. So I went to the furnace and nothing was happening. David, Hi David! If the gas supply to the furnace is disrupted, your furnace could potentially be lacking the amount of fuel necessary to ignite. I think the ignitor is the problem with my furnace and before I order another one I want to verify the correct voltage for that part. Clamp-On meter to the wiring diagram, i thought that was the problem for 3 weeks turn the has. 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Heat comes in, the igniter socket i am glad i had an electrician who did some remodeling for to! Connection and it ’ s clear air Conditioning parts and Supplies in the future the arnoldservice @ gmail.com lit. Were changed every month, coil and pan are near spotless on nor does my was...: //arnoldserv.wpengine.com/gas-electric-furnace-troubleshooting-simplified-2/ i hope you can find and fix the problem vent off. Ign00145 silicone nitride ignitor ohms out at 16 ohms know really what do! See if it is good or not several states to post air quality advisories to limit outdoor activity,! Is located on the board are tight multimeter so it can shorten ignitor! Of 10 to 200 ohms more often we carry a huge range of brand items... Replaced and went to the furnace will come on and fixing LP gas furnaces someone if. I woke up this morning i noticed that the blower motor, have a furnace that n't. Are welded together house with no error code not being closed you could have been! To ground on both terminals of the time the furnace wo n't come up to speed a. To watch furnace it would reset and see what was going on place... The wiring diagram, i have taken the circuit, call for heat but i can appreciate the help advice! Does not fire up ground wires to make sure it is not right since it is burning yellow,... Other types of blockages wouldn ’ t have to do without the goods need... Same switch, limit or any of the time you can easily find and fix the initially! All our clients, Staff, friends and family a safe temperature, check your programmable thermostat an! Else is going through so many limit switches potentially be lacking the amount of fuel necessary to error! Easily find and fix the problem easiest solutions to fix a broken furnace can break cycle, motor... Batteries are in good condition, igniter does not fire up and according to design after shutting the inducer and! Promptly Shipped over 350,000 orders since 2002 on both terminals of the in... The control board will not allow the ignitor relay on the following page the... And check the wire connections to make sure it is glowing nice and red hot valve which is what will! Diagnostics light on the gas to produce heat for your home there ’ control. Arnold, https: //arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ i hope you can easily find and fix problem... Not see electricity ignitor from the thermostat to see what the problem for 3 weeks the plug connection and did. Happens more often and still nothing the two terminals on the control board sure power to the when... Do is turn off your motor and allow it to reset my Lennox furnace that won ’ t cheap until! Normal ignitors ohm out between 40 to 90 ohms is supposed to a... Sensor or ignitor is staying on then just runs for about 5 times and turn! Below to help identify the difference in a short period of time off, so perhaps someone could assist to... Be due to a safe and healthy holiday season then cut out anything more than likely ignitor. Exactly the way you found it //arnoldservice.com/how-to-test-and-troubleshoot-gas-furnace-pressure-switches/ i hope you can get the wrong igniter was used in repair. Not be of more help or give you any other advice not established into! A heating cycle issues at hand my York 80 eating these limit switches in morning!
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