Gas furnaces are protected against over-temperature by a high-limit switch. There are also various mechanical issues that can inhibit the ignitor. Instead of asking yourself "why is my furnace not kicking on, " give our team a call. If the gas supply to the furnace is disrupted, your furnace could potentially be lacking the amount of fuel necessary to ignite. Temperature Limit Switch. It must have the functions you require such as two-stage heat or cooling, etc. If you don't smell gas, or see any flashing lights, check each of these items to determine the cause of your ignition issue. The oldest way is by a pilot light and over the last 30 years or so these have been replaced by electronic ignition systems. Your furnace won't ignite due to one or more of the following reasons: 1. It should look just like a light switch and be located on or right next to the furnace. The flames may not completely burn when the burners are clogged with debris, creating a higher amount of carbon monoxide in your system. A filter clogged with dirt may make the switch think temperatures are getting too high.
- Gas furnace will not light
- Furnace won't light the burners get
- Furnace won't light the burners fire
- Furnace won't light the burners heat
Gas Furnace Will Not Light
Our team of NATE certified technicians has the knowledge and experience to service your HVAC system correctly. In most cases of furnace burner failure, you should never attempt to solve the problem on your own. Unless you're sure of what something does, don't touch it. Cowboys Air Conditioning & Heating has an excellent preventive maintenance agreement that will keep your heating and cooling tuned-up with two maintenance visits per year. After a gas furnace opens the gas valve to allow gas into the combustion chamber, the furnace control board will monitor for proper ignition of the gas. Also, check that the power to the furnace is on. Once the pilot is lit, and the main burner senses the pilot flame (using a flame sensing rod), the main burner ignites.
Furnace Won't Light The Burners Get
You can't turn on your furnace unit. Most furnaces with electronic ignition are either conventional induced draft furnaces or high-efficiency condensing furnaces. The flames from the burners may be going out because they're struggling to draw enough oxygen for combustion through excess dirt or other grime along their surface. Blown fuse/tripped circuit breaker: Modern gas furnaces do not run entirely on natural gas. The igniter turns on the pilot flame. If the burner won't ignite, the furnace will not generate heat, and you'll only receive room temperature air from your vents. We've created quite a lot more content on the issue of airflow and air filters.
Furnace Won't Light The Burners Fire
Solution: If the draft motor doesn't come on, be suspicious that it might be the cause of your trouble. If the sensor or ignitor is dirty, it will need to be cleaned. The HSI includes a fork-like attachment, a plastic base, and two wires. A circuit breaker has tripped– If the blower motor in the furnace causes a power overload that trips the circuit breaker, not only will the motor fail to come on, the burners won't fire either. If burners are dirty, they can't bring in the oxygen necessary to ignite them. Call an HVAC professional to check it out. Follow exact instructions for thermostat replacement. There Is Something Restricting Air Flow. The flame sensor tells your furnace that the gas is lit. You might be charged for the service – another reason to make sure you don't run out of propane! These furnaces skip steps 3-5 and instead light the burner directly. One example of this is when your furnace's drain pan is not draining properly.
Furnace Won't Light The Burners Heat
Pro Tip: It's not a bad idea to pre-emptively replace the igniter. If you smell gas, leave your house immediately and call your gas company. You'll find links to the right on the thermostat wiring page and the Buying Guide. The airflow into the furnace comes from the blower fan that draws air through the return air ducts. Once clean, reinstall the flame sensor directly back into the location from which it was removed. Take the cover off your furnace and look for one or two lights. 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. Our guide "How to Tell if Your Furnace Ignitor Is Bad & Where to Buy One" has step-by-step instructions that are easy to follow, if you need them.
Reset any tripped breakers, but don't continue to run the furnace if a breaker trips repeatedly. Sign Up for Regular Maintenance for Your Furnace.