Mike, Hi Michael! If any of the safety controls open up because they have over-heated or not getting the right pressure then the control board will not allow the ignitor to glow. The problem could be coming from the control board or any of the safety controls (pressure switch, limit or rollout switch). The soonest I could get anyone to the house was two days later… so we got by with sweaters, slippers, extra blankets, and running the gas fireplaces 24/7 for a couple of days. This problem can be caused by an improper fan delay setting or a problem with its controls. Steve. I hope you can easily find and fix the problem. Sorry to hear that you have replaced several parts and you are still having trouble with the ignitor not glowing. After starting the furnace up after the ignitor replacement I see and hear the ignitor not making good contact with some control on the furnace making some weird noises. Your ignitor is probably good and if all your safety controls are closed then I would think you need a control board. Can’t figure out if it’s the igniter/sensor assembly or gas valve. Any insight you can provide is greatly appreciated. Three so far. You should hear the gas valve at least trying to open. Hello Steve, I recently removed the burners in my Lennox furnace to clean them, I turned off the gas vale but forgot to turn off the electrical power to the furnace prior to beginning work on them. 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. Thanks for the quick reply! I hope you can easily find and fix the problem. We are looking forward to doing business with you in the future! 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. I hope that you can find and fix the problem soon! I would start checking by setting your voltmeter to “Volts AC” and check between L1 and any white neutral wire on your control board. I have a Heil furnace, model NUG5150BKB2. So I went to the furnace and nothing was happening. Steve, I have an older York central furnace, gas, that I installed in 1999. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning. HVAC for Beginners: Furnace Troubleshooting, Before You Call The Repairman... Heat Pro: Will I Heat My House Faster If I Get a Furnace that Is Twice as Large? Since you are not getting power to the ignitor then this could be an open limit, open rollout, open pressure switch or a bad control board. Steve. Steve. Don’t know if its as easy as a bad thermostat not sending the correct heat request… please help, Hi Carlos! 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. Is the furnace itself turned on? LP gas can be temperamental at ignition. Probably the contacts inside the relay are welded together. I went down to smell for gas and didn’t smell any. Hi Shawn! If any of the safety controls like the limit, rollouts or pressure switch is open then the ignitor will not glow. Merry Christmas Jay! The gas valve opens then after 3 resets it goes into a lockout with no error code. Try cleaning the flame sensor with a fine abrasive pad. I will email you and send you some of the pictures from our Lennox parts program that shows the parts for your furnace. We sell furnace parts, air conditioning parts, AprilAire filters, EZ Flex filters, and many other HVAC parts and supplies at affordable prices. I am getting a fault 34. Sorry that I can not be of more help or give you any other advice. If the ignitor relay is bad on the control board then you will need a new control board. Please send the model number to our email address: arnoldservice@gmail.com. Peter. The control board’s LED is steady on. If your pilot light will not come on after cleaning the furnace, check your gas or propane supply as a final step to find out why your furnace will not start. I hope you find and fix the problem soon! Yes, even gas furnaces you electricity. 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. Steve. If you have any questions please let me know. I checked the voltage to the plug connection and it reads 116 volts once the inducer fan and pressure switches are activated. You can also check the fuse/breaker to make sure the furnace breaker has not been tripped. I tried to perform reset sequence from the Lennox manual but still got no power. I have a Goodman Furnace that a technician recently replaced the control board on 2 weeks ago. Any kind of air restriction in your supply or return can cause a problem too. Below are pictures to help you identify the difference in a flame sensor and a hot surface ignitor. An over-sized heater can heat the air too fast, raising the temperature near the thermostat faster than that in the rest of the house. Weather warmed up did not need furnace for two weeks. I am sure you have probably already checked the pressure switch. I would make sure that all your safety controls like the limit, rollouts and pressure switch are all closed. Hi Steve, Thank you again. If any of these are open the the ignitor will not glow. If he didn’t he would need to use a manometer to make sure the pressure is right coming out of the gas valve. Would the next step be to check the hose on the pressure switch? A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. The unit is 14 years old and hasn’t had service or maintenance done in 5 years. Check around the furnace for signs of damage or burning. We have a good post on troubleshooting pressure switches on the following page: https://arnoldservice.com/how-to-test-and-troubleshoot-gas-furnace-pressure-switches/ I hope this helps you out. :-0, Fantastic! Hi Mickey! Gas supply problem. However, gas-fired boilers are fairly reliable and when problems do occur, they are usually related to the expansion tank or water circulation pump(s). Step 8: Furnace Won’t Turn On – Check Your Ignition Sensor. If you are not getting a minimum of 110 volts to the ignitor then you probably need a new control board. Possible causes: The furnace could need resetting. Sorry, if I insult your intelligence, but I need to ask these questions and make the following recommendations many of these recommendations I read in your comment you have already completed. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. Merry Christmas! I can not send pictures through our comments page. What could I possibly be missing? You might need a new control board. gas furnace will not firehttps://www.valuetesters.com https://www.interplaylearning.com for free trial. If your thermostat has batteries make sure they are good. 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. Steve. The furnace is 20+ years old so I ordered a new board to eliminate that as a source of any voltage problems. Disconnect the hot surface ignitor from the control board and measure the resistance. Problem: Furnace will not ignite the gas to produce heat for your home. 3 blinks on a Goodman furnace usually mean a pressure switch problem. I hope you have a great day! Steve. Most furnaces have safety door switches. Sorry, you are having this problem in this cold, cold weather! 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. If the burners ignite and heat, the problem isn’t the gas supply. Thanks! Although I think my igniter is bad, the system is never getting to that point. Hi Robert! I would like to suggest that you make sure the pressure switch hole is unobstructed. I replaced the ignitor because it wouldn’t glow and was reading 90 ohms. Steve, Steve, My problem is similar but I do not appear to be getting pressure thru the hose system to the pressure switch. Is there an issue with the gas company? What could be the problems. I had the ignition switch replaced and went to bed happy that it was working. These can malfunction—repairing or replacing them is a job for a professional HVAC technician. I hope you can easily find and fix the problem. Why am I not getting any power to the limit switch when using a jumper. Recently installed new flame sensor and igniter. I looked up the parts for your furnace in our Lennox parts program and it shows that your furnace uses a DSI (direct spark ignition) and not a hot surface ignitor. If you do it can shorten the hot surface ignitor’s life. You could try tapping on the relay with your fingertip to see if it will release or get a new control board if it will not release. He started working with Mechanical Turk and then started contracting with individuals and companies directly via the Web. God bless you and your family. If the ignitor is staying on then this will of course shorten the ignitor’s life. If they are not closing then the ignitor will not light. We Provide Fast UPS Shipping! Since you ignitor has such a low resistance then I do not know really what to think. 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). He has written advertisements, book and video game reviews, technical articles and thesis papers. In the process of removing the burner tubes, I also had to remove the flame sensors and put them down onto the metal housing while the power was still on. If you would like for me to look up parts…please send your furnace’s model number and serial number to our arnoldservice@gmail.com email address and I will be glad to look up the parts. Set the multimeter so it can properly measure a resistance of 10 to 200 ohms. Arnold’s Service Company, Inc. is a family-owned, Christian business that always treats customers with consideration and respect. i have a older miller and for some reason its not lighting it gives the code that everything is okay but it wont light I am not sure what to do please help I live in a trailer and cant really use the electric heaters gives me a 500 dollar electric bill I know I have gas the tanks just got filled. If you would like for me to look up a control board or other part please send me your furnace’s model number and serial number to our email address arnoldservice@gmail.com. Your gas- or oil-burning furnace must receive fuel to work. The ignitor works and it starts up but no gas is getting through. Can I put a clamp-on meter to wires from valve to ignitor? With an oil furnace, check the fuel supply. I hope you can easily find and fix the problem. Hi Jake! Great that you saved lots of $$$ doing the repair yourself! The Bryant plus 90 furnace should be a good one. Is the furnace switched on at the breaker panel? Hi Mark! Steve. I checked the pressure switch and I cleaned the igniter. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. You should get 24 to 28 volts AC between each of the two terminals on the rollout or limit to ground. Hi Dustin! I hope you can get the problem found and fixed soon! I am sure that it wasn’t cheap! Make sure that your furnace door is good and secure. The unit, Trane Xr90, goes through the cycle, does not ignite, and then eventually locks out. Even though the hot surface igniter does not glow, and there is no gas (I can’t smell any after hours of operation), the furnace continues to work as usual, blowing cold air through into the house continuously (fan is set to Auto, heat is on and at 74degF). 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. If you need for me to look up parts please send me your furnace’s model number. I’ve replaced the ignitor and the flame sensor. I had just replaced the ignitor last winter and I assume that the pressure switch that caused the ignitor to work erratic was why the ignitor failed so soon. Inside the unit is extra clean, as was filter. The limit as I am sure you know is a safety control that should only be used to shut the furnace off if your furnace over-heats like in that case that a blower motor failed. Today I tried it because of how cold it is and it fired up. Steve. Here is a link to that page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I hope this helps you out. New ignitor, cleaned the flame sensor- should be good until next time! Failed or no gas is available is supposed to recognize a bad Smart valve a! 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