Check your filter and for weak ductwork that's "oil-canning". I have to clean mine ever three to four months. (Good friend of mine is Paul and he's an HVAC man too.). I wrote the article Comparing the Cost of A New Furnace to How Much You'll Save to help those out who are looking to replace their furnace and want to know exactly what to expect. I've had each of them shut off and later discovered that it was a simple maintenance issue. This is especially possible with combination operation (e.g. It’s possible for a flame sensor to go bad; but more often than not, it is not broken, just dirty from carbon buildup. Pay it forward! The stat won't respond because the circuit board has overridden it as a safety default. Then I would check the board. Should I move on to the limit switch, pressure switch and circuit board? Wasteoilheatingparts.com email: sales@wasteoilheatingparts.com (877) 754-0446. I guess this is a start. Inspect the burner flame sensor, “cad cell”, to be sure the lens is clean. Then, use a clean paper towel to wipe clean any dust left behind by the sanding. You may want to keep an eye for water being where it shouldn’t. Question: I tried both cleaning my furnace's flame sensor and later installing a new flame sensor. So many heating and air conditioning problems seem to come out of lack of upkeep than anything else. It is very hard to diagnose intermittent issues when the unit is working while you're inspecting it. Thank you, thank you thank you! Thanks for reading and commenting. I would recommend you have the furnace cleaned or if you're handy and comfortable with your skills, try and do so yourself. The last few times mine has been dirty, just using a damp paper towel on it has cleared up the problem. It is currently 3 degrees out with a -22 wind chill and we are in the middle of a blizzard warning. If the flame sensor appears dirty, use a gentle abrasive pad with fine bristles to clean it. I have had same furnace same stove both like 5 years old. While it is blowing hot, it will respond to the thermostay, but after the flame shuts off, the thermostat doesn't control anything. Funace kicks ln and runs for minute then stops. So thank you so much! A typical breaker panel, where you may also be able to turn off the power to your furnace. This prevents your home from filling up with harmful gas fumes, which has dangerous consequences. Your welcome. You are a god send! My furnace blows hot air for about 30 minutes and then the flame shuts off, but the fan will continue to blow cold air and will not respond to the thermostat. Answer: I’m sorry but no. Lennox Armstrong Ducane Furnace Flame Sensor 65209300 17J5601 17J56 This is a brand new Original Equipment Manufacturer (OEM) Lennox Armstrong Air Ducane Aire-Flo furnace flame sensor, part# 17J56. April 2018 (1) ... Professional Gas and Oil Furnace Cleaning in Colorado; Gas and CO2 Leaks; Flame Sensor When working properly, the flame passes over the sensor producing a minor electrical charge in millivolts. Call A Professional. Between the first and second burner ports (from left to right) you can see the wire leading to the flame sensor. Not sure why night and day are making a difference but yes. Sorry. Now, not only are you without heat, but your futile efforts to start up a heater without a working flame sensor can cause wear and tear on other parts, reducing efficiency. It goes through the first 3 stages, I can see the flame, but it shuts off in a few seconds, right before the blower should start. A Defective Flame Sensor. Does the flame just conduct, or does it carry charge to the probe ? By detecting the presence of a plug in light sensitive cell and cold... That there is a flame within the furnace to blow cold air, too. ) the firepot unit to. 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