There are a number of reasons this might occur, but whatever is behind the problem, you should not attempt to troubleshoot it yourself. An older gas furnace has a standing pilot that stays on all the time — or at least, it's supposed to. I have a Trane furnace with electronic ignition. The standing pilot light has given way to electronic ignition systems that use less energy and are more dependable. The gas valve opens. If your furnace won’t turn on, it suddenly stops working, or the circuit breaker keeps getting switched, you may have a problem with your ignitor. Small exhaust fan comes on, igniter starts sparking with what looks like a good spark to me, but 70% of the time it won't light the natural gas. Under normal conditions, an HSI should last three to five years before it will eventually crack and need replacement. The electric ignition is one of the reasons modern furnaces have seen a rise in AFUE ratings (annual fuel utilization efficiency) and have remained competitive with other, newer heating systems. Lighting a Pilot that is Electronic Ignition Comment: Thank you for your interesting discussion of pilot lights vs. electronic ignition. This is an easy and fast job for an experienced HVAC technician. First determine if you have a standing pilot furnace or a furnace with an electronic ignition. Newer gas furnaces are equipped with an electric ignitor to light the furnace and turn the fuel into heat that then warms your home. When a furnace has a bad ignitor. Intermittent pilots still use a pilot light, however it isn’t a “standing” pilot light that remains on all the time to ignite the burner whenever the gas turns on. Burner Won’t Light. If your furnace is equipped with an electronic igniter, you cannot light the furnace manually. One type of electronic ignition is an intermittent pilot. A flame sensor lets your furnace know that the pilot was successfully lit. The standing pilot light was the regular way to ignite gas-powered furnaces for almost as long as these heating systems have existed. The furnace hot surface ignitor does not glow. I have a 40 year old Mueller gas furnace that we don't use much. If you don’t know how to light a gas heater, it’s helpful to know that it may take a few minutes. Additionally, can you manually light a gas furnace with electronic ignition? If your furnace has a pilot light that’s lit all the time, then you have a standing pilot furnace. Additionally, another common problem that can occur with electronic ignition gas furnaces is that the igniter fails for whatever reason. A pilot light that constantly extinguishes itself could be caused by three issues: A bad or loose thermocouple Most older furnaces are standing pilot. Not having a pilot that is continually lit means more efficient operation. There are two different kind of electronic ignition systems. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning. This switch senses proper air flow through the plenum and then turns on the propane. This is a fairly common problem every RVer faces. When the furnace kicks on, the ignitor should glow. To determine this, turn off the thermostat. Call Today: (908) 707-1776 Failure Of The Furnace’s Electronic Ignition. Gas furnaces are potentially hazardous if they receive untrained work. Of course, this applies to spark ignition electronic ignition gas furnaces. If your furnace won’t turn on, it suddenly stops working, or the circuit breaker keeps getting switched, you may have a problem with your ignitor. You may have a bad sail switch. Answered in 5 minutes by: 10/23/2009. If you have a direct ignition furnace, you won’t have a pilot light. Why don't the burners light? Common problems with IP ignition include: The hot surface ignitor (HSI) is the most commonly used electronic ignition system. These furnaces skip steps 3-5 and instead light the burner directly. RV Make: forest river, RV Model: fr3, RV Year: 2016, Brand: suburban. RV furnace operates with a 10.5 V supply and at times if the battery is not able provide above 10.5V then the furnace wont ignite. These small flames ignite the gas when a call for heat comes to your furnace from your thermostat. The furnace not igniting can happen because of several reasons, so whenever I have an issue like this, I follow a few steps. Here is a quick guide to quick fixes for your furnace ignition system. However, you may be able to get the furnace working by turning off the igniter and resetting it. Please give it a couple of minutes to be sure that the gas is gone. Older gas-fired furnaces may have pilot lights. Bob Formisano is a licensed architect and builder with 30 years of experience in the industry. The first is called an electric spark igniter, which activates the pilot light only at times when it’s needed. It won't light. All rights reserved. If you have a newer furnace (or one with an AFUE rating above 80), it most likely has an electronic ignition system. Standing Pilot Furnace. 5 Reasons Your Gas Furnace Won’t Ignite. Newer gas furnaces are equipped with an electric ignitor to light the furnace and turn the fuel into heat that then warms your home. It is a gas furnace, the gas flow is not a problem. What to Do When RV Furnace Won’t Ignite. This system uses a pilot flame, but the flame lights only when there's a call for heat from the thermostat. Like a conventional pilot light, an intermittent pilot light still uses a small, gas-powered flame to ignite the furnace’s burners. There are two basic types of electronic ignition systems: Understanding some of the basic components of a modern furnace will help you identify the type of furnace you have and narrow down the list of potential problems. BillyHvac, Journeyman HVAC Tech. 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. The most common reason for this problem is because the pilot light is not on. Delayed ignition is a similar problem and clearly identified by a loud banging noise before the ignition occurs. The Condensate Pan Is Full. This system is more reliable and safer than old conventional furnaces, which relied on a natural draft coming in from an opening at the front of the furnace. As a safety feature, your furnace won’t light if the pilot is out. If you can’t find the ignition button, check the instruction sticker on your furnace or the the owner’s manual. However, just like a pilot light going out, if your electric ignition fails, the gas jets in the burner will not come on and the furnace will provide no heat. Older Models. Do Not Do This! Instead they use electronic ignition systems that light only as needed. However, you may be able to get the furnace working by turning off the igniter and resetting it. Typically found in induced draft furnaces, an intermittent pilot ignites the burner gas with a high-voltage spark only when the thermostat calls for heat. 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