Have issue today with ignitor on a Rheem criterion. In all cases, it is important that you don’t have anyone work on your furnace that is not trained as an HVAC specialist. Another thought would be to make sure that if your thermostat has batteries, make sure the batteries are in good condition. Learn more from the furnace contractors at Air Experts in Raleigh, NC! 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: arnoldservice@gmail.com. However, if it continues to trip, call an HVAC technician because something is wrong. 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. Your furnace man might need to adjust the pressure on the furnace’s gas valve. I would like to suggest that you check to make sure the ignitor is shutting off after the furnace gas ignites. Hi Pat! Thank you. A good hot surface ignitor will have a resistance of. I hope you can easily find and fix the problem. It actually worked sporadically (which had me stumped) but finally quit. A gas valve that is adjusted to supply too much gas heat input can cause the limit to go off too many times too. 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. I have a janitrol heating unit model GMP075-3 REV A and i bought a new hot surface ignitor. First check to make sure the furnace filter is clean and has been recently changed, then be sure to make sure all vent registers are clear of furniture and other blockages. I hope you can easily find and fix the problem. The control board’s LED is steady on. At times, especially in the morning after allowing a temperature drop over night, the furnace will not function. This sounds like you have a high voltage issue. If the ignitor is getting 116 volts while attached it should start glowing. Don’t know if its as easy as a bad thermostat not sending the correct heat request… please help, Hi Carlos! Top Five Reasons Your Furnace May Not Be Igniting 1. Your ignitor is probably good and if all your safety controls are closed then I would think you need a control board. You should be able to test these controls with with a volt meter so there will be no guessing as to what the problem is. Steve. Thanks! Often, newer electronic thermostats will display an error code if something is wrong. Hi Mark! Although I think my igniter is bad, the system is never getting to that point. This furnace has an intermittent pilot light system. At least I eliminated the fuse factor. Remove the front panel and look for the ignitor/sensor. I a keeprite furnace with orange blinking light. 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. I’ve replaced the ignitor and pressure switch – still nothing. I replaced the ignitor because it wouldn’t glow and was reading 90 ohms. Just do not leave the exhaust vent pipe off. I rechecked the manual and I noticed I was looking at the wrong model when I saw the reference to the SiNi HSI; that was for an older version of that model. I hope you can easily find and fix the problem. Most furnaces have safety door switches. Is it possible that the wrong igniter was used in my repair? 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. We have a post about this on the following page: https://arnoldservice.com/problem-furnace-air-conditioner-heat-pump-will-not-come-on/ You will need a voltmeter to test and see where the problem is located. Your furnace wiring schematic should show any fuses. I hope you can easily find and fix the problem. I would ask the questions: Is your furnace gas shutting off and is your furnace going off on high limit? If your ignitor tests OK with an ohm meter, then you could have a furnace control board problem or you could have an open limit or rollout switch problem. This … I turned the power off at the breaker. Hi Jake! I hope you can easily find and fix the problem. I checked the pressure switch and I cleaned the igniter. The unit cycled and ignited. Peter. 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. Merry Christmas Dan! 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. Your furnace could also be the cause of the problem. My house is cold and have 4 kids. On Rheem Ruud furnaces we will need both model number and serial number. I hope you can get the problem found and fixed soon! If you would like for me to look up parts then please send me your furnace’s model number to our email address: arnoldservice@gmail.com. Why would i not be getting the vacuum to close the pressure switch? 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. ... View Video I would ohm out the ignitor and make sure it is between 40 and 90 ohms. This leads me to believe there is a problem with air flow. It involves turning the power to your furnace off, checking the basic elements of the furnace, and waiting a little bit before turning the power back on. Hello – I have an old Janitrol furnace. This fall has been one of the worst for air quality in our nation’s history. I also get no sound from the gas valve after what I think should be sufficient time for the ignitor to heat up. Where you stop getting the 24 volts is where the problem is located. Since thermostat gets power from the furnace circuitry, I guess until I resolve the ground short in the furnace it would remain blank. Thanks for letting us know! Solution: You probably need to purchase and install a new ignitor. You could also have a control board problem that is not allowing current to the limit. Best of luck! If it is then this is the reason that you are going through so many limit switches. If you need for me to look up parts please send me your furnace’s model number. Top Five Reasons Your Furnace May Not Be Igniting. Steve, My gas furnace is not getting gas. I hope you can easily find and fix the problem. We Have Promptly Shipped Over 350,000 Orders Since 2002! Fires on the west coast have caused several states to post air quality advisories to limit outdoor activity. As luck would have it, we are headed for 30 degrees this weekend. URGENT. This means the furnace has failed to ignite. Remove it with a screwdriver and clean it while being careful not to break it. I also checked continuity through the igniter by itself, and all the wires connected to it, all the way to the IFC mother board. 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 to Call a Certified HVAC Technician? If an ignitor is bad will the furnace be shut down completely? So very glad to hear that you found and fixed the problem!Yes, that limit switch on the blower is sometimes hard to see and find. 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. The longevity is like a light bulb, very hard to determine. Steve. You should be getting 24 to 28 volts AC between at least one wire that goes into your limit switch to a good ground on the furnace body. Please click here to go to our furnace limits and rollouts page. Copyright © 2021 Assured Comfort All Rights Reserved. Just to be safe before I purchased an expensive control board I would suggest trying a new ignitor. Most ignitors read between 40 to 90 ohms if they are good. Hi Tracy! I’ll check the rollout and limit switches in the morning. I hope you can easily find and fix 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. Finally, if you smell gas or believe there is a leak, evacuate your home immediately and call a professional to evaluate the emergency issue. Some rollouts have buttons on them that you can push in to reset. We offer same-day shipping on most products, so you won’t have to do without the goods you need for long. I tested the pressure switch today and it is good. I’m having this same problem with a Goodman furnace. 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