Normal ignitors ohm out between 40 to 90 ohms. I have gas everywhere else in the house with no problem. Steve. God bless you and your family today and always! So sorry to hear you are having this trouble and a run around between the propane company and furnace man. I had the ignition switch replaced and went to bed happy that it was working. With an oil furnace, check the fuel supply. The main blower coming on before heat concerns me also. This problem can be caused by an improper fan delay setting or a problem with its controls. 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. I’ll check the rollout and limit switches in the morning. 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. 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. Solution: You probably need to purchase and install a new ignitor. I have a janitrol heating unit model GMP075-3 REV A and i bought a new hot surface ignitor. We hope this will help you troubleshoot and repair your furnace. Hi Pat! At least I eliminated the fuse factor. By the way, never take a gas valve apart, unless working as part of a demolition team. On Bryant Carrier furnaces we will need the product number. I would think that you have an airflow problem that is not allowing enough air through the heat exchanger to keep your furnace running at the right temperature rise. Some transformers and furnaces have fuses on the transformer to protect the transformer. I hope you can easily find and fix the problem. Steve, I have an older York central furnace, gas, that I installed in 1999. This sounds like you might have a loose connection or a control board problem. Hi Jake! I’m having this same problem with a Goodman furnace. 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. Three so far. Would the next step be to check the hose on the pressure switch? Awesome! We Provide Fast UPS Shipping! 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. 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. What am I missing here. 3 blinks on a Goodman furnace usually mean a pressure switch problem. I checked the pressure switches for continuity and they all perform according to design. I am sure that it wasn’t cheap! This sounds like you have a high voltage issue. The part number for the DSI is 43K3101. Hi Shawn! I have checked all the switches and they appear to be fine, I got 24 – 28 volts off both sides of all switches. Understanding the components of a hot water boiler can help with basic troubleshooting. I would suggest that you call a company that has a good reputation with working on and fixing LP gas furnaces. Mike, Hi Michael! Steve, My gas furnace is not getting gas. This sounds more like a control board problem with the ignitor relay on the control board at fault. The unit cycled and ignited. No blinking. 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 have a Carrier 58MCA/58MXA, not sure which but that’s the manual that was left when the house was built. blower motor wheel is spotless. Hi Lawrence! Thanks much, Steve! I hope you find and fix the problem soon! Steve. Steve. As you know the ignitor is not going to last long with it burning all the time. I would like to suggest that you check to make sure the ignitor is shutting off after the furnace gas ignites. I had similar issues to the previous commenters. Steve, Steve, I have an RGRA Rheem furnace that is not getting power to the igniter. If any of these are open the the ignitor will not glow. With older furnaces, almost half the heat was lost before making it into the house. Respectfully. I hope you can get your furnace fixed and going soon! After checking all the systems, I decided to look into the IFC. Too much gas pressure would make the furnace go off on limit and this would not be good. This could also be a control board problem. Steve. The furnace stopped after 2 weeks. I have a problem. If you would like for me to look up parts then please send me your furnace’s model number to our email address: You might smell some gas. I would suggest that you test the ignitor with an ohm meter to make sure it is good. If the flame sensor does not detect a flame, the co... ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. The contacts inside the relay on the board are probably worn or pitted. Your furnace should run without going off on limit. Steve. If an ignitor is bad will the furnace be shut down completely? Steve. Thank you. I would ohm out the ignitor and make sure it is between 40 and 90 ohms. The condensate pump reservoir might be full instead. The main blower then comes on but at no point do I get any voltage to the ignitor. We have processed over 25,000 Successful PayPal Orders! You should have 24 to 28 volts AC between R and C. If you do not then you have a low voltage problem which could very well be a low voltage transformer that is burnt out. It stopped working all together the other day, went to check it out and noticed that it was in Ignition lock out mode. On Rheem Ruud furnaces we will need both model number and serial number. I really do not understand why your furnace is going through so many limits. If all the safety controls are closed then I would check to see if you are getting 110 volts to the ignitor when it is supposed to be glowing. If you are not then I would suggest looking to make sure that all the rollouts are closed. Thanks for the quick reply! Before you assume that anything is wrong with one of the parts of the system, consider the possibility that your furnace is the wrong size. Normal click(s) and the blower but no lighting takes place. Our email address is: We are Accredited Better Business Members with an A+ Rating! Still have no real idea what it could be . We have UPS Ground, Next Day Air Saver, 2nd Day Air, 3 Day Select and UPS Sure Post shipping options in our shopping cart. The igniter is brand new and reads about 17 ohms when checked across its terminals (ohm reading is correct for this igniter unit). Steve. When I put a meter to the igniter socket I am measuring 40v. It is supposed to stay on for two to three minutes after the furnace shuts off in order to push the last of the warm air out into the house. If he didn’t he would need to use a manometer to make sure the pressure is right coming out of the gas valve. I checked in our Trane parts program. Please be careful and check the wire connections on the breaker to make sure they are good and tight. It had no power at that time too. Please Click Here to see the name brand Furnace Ignitors. To make a long story short it turns out that the pressure switch was not making good contact. Make sure the furnace is on. Best of luck! We have a good post on troubleshooting Honeywell Smart Valves on the following page: There have been lots of problems with the Honeywell Smart Valves. If it is and you’re not receiving gas, you will need to call a plumber to address the issue. We have a furnace troubleshooting flow chart: and many questions with answers and videos on the following page: I hope you can easily find and fix the problem. Steve, I have installed the 4th high limit switch and it worked for a total of three days. So sorry to hear that you are without heat. Thanks! There are a number of other potential causes as well, such as faulty gas valves and control board faults, but these cannot be easily diagnosed except by professionals. The longevity is like a light bulb, very hard to determine. If any of the safety controls like the limit, rollouts or pressure switch is open then the ignitor will not glow. 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