Here are other reasons your furnace may be short-cycling. FYI: *You would be surprised how many people go without heat or cooling for hours/days and all the problem they have is the switch on the side of the furnace is not turned on or the blower door is loose after they change a filter! Any ideas? If the furnace has rollout switches please make sure all of these are closed. This is typically located near the burners. Thanks! Another thought would be to make sure that if your thermostat has batteries, make sure the batteries are in good condition. - Furnace repair service heating installation HVAC ac repair heating rebate Hot Water Tanks, Boilers BC Furnace Vancouver Burnaby Surrey Coquitlam Richmond We Have Promptly Shipped Over 350,000 Orders Since 2002! Please make sure all connections on the control board are tight. I checked in our Trane parts program. Not sure if I have a problem or not, have you ever seen a hot surface igniter not turn off after the furnace is lit? 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. Have issue today with ignitor on a Rheem criterion. 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). If the ignitor is staying on then you probably have a stuck relay on the control board. 919-480-2727 BOOK NOW. If your thermostat has batteries make sure they are good. If you would like for me to look up parts…please send your furnace’s model number and serial number to our email@example.com email address and I will be glad to look up the parts. Like any electrical component, the igniter for a furnace can break. Steve. I hope you can easily find and fix the problem. On the bottom is a picture of a hot surface ignitor. You Can Search Our Site for More Troubleshooting Problems, Heating, Air Conditioning Parts and Supplies in the Google Seach box below. I’ve replaced the ignitor and pressure switch – still nothing. Also make sure it is not glowing erratic like my ignitor was doing last night! Furnaces are designed with lots of safeties to prevent fatal and tragic accidents. Steve. I tested the pressure switch today and it is good. Many homeowners discover that their furnace is not working when they go to turn it on for the first time of the winter season. 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 it still doesn't work, after you have tried all of those options, the problem is probably slightly more tricky than a simple thermostat fix. The inducer motor spins fine, and looks like the voltage at the pressure switch is ok. Don’t know about the limit switch – could that be it? Steve. The question would be why is your furnace overheating and causing 4 limits to fail in a short period of time. God bless you all! It will not hurt anything to leave the combustion air vent pipe loose until it warms up. 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 hope you can easily find and fix the problem. Recently installed new flame sensor and igniter. Then check between R and C (com) thermostat wires. Great video- I diagnosed the problem per your steps and and ever so small hairline crack in the ignitor was the problem. Some rollouts have buttons on them that you can push in to reset. The next step would be to measure the voltage as you suggested above. I hope you can easily find and fix the problem If you need a control board or other part please send me your furnaces model number and serial number and I will be glad to look it up. 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