It should have three settings: on, off, and pilot. Check the pilot light. I found this thread on yahoo, I have a furnace I believe 20yr old, Will I save money on gas by replacing pilot lighter to a spark ignitor ? Why does this happen? RV Make: Keystone, RV Model: Passport, RV Year: 2007, Brand: Keystone, Model Number: 28bh. Some common causes include issues with the thermocouple and pilot tube. Furnace won't come on unless you blow on the pilot light [ 2 Answers ] We have a older rheem gas furnace with a honeywell 3300 thermostat. For better or worse, a pilot light extinguishing isn't all that uncommon as even a light breeze or draft of air is enough to kill the tiny flame. But you have to do this every time. If the pilot light won’t stay lit, the opening may be clogged. Already Tried: replacing air filter (which was filthy) and the igniter, which did not look to be shorted out. First, check to see if there are specific directions printed on the exterior of your gas furnace. Lighting a Pilot that is Electronic Ignition Comment: Thank you for your interesting discussion of pilot lights vs. electronic ignition. The furnace is a Roberts-Gordon, 25 years old. My HVAC guy can't get out til next week. The pilot light in your gas furnace supplies heat to your home. … read more. Once the burn cycle is complete, both the burners and the pilot turn off. Pilot won’t light in my gas furnace, I’ve replaced the thermocouple the fan works great, I just had it running 5 days ago and now nothing, Reply; Bradley Moore . Are there any troubleshooting tips? You should be able to see it when you open the combustion chamber door. One of the most common problems with aging furnaces in St. Louis area homes is when the pilot light goes out. A faulty thermocouple may arbitrarily determine that the light is off when you want it on and vice versa. The thermocouple is a rod that comes into physical contact with the flame in your system. Sometimes this can happen simply due to a strong draft nearby. Your furnace's thermocouple, if it works normally, checks to see whether the pilot light is on or off. It did work as recently as two days ago. This component will deactivates the gas when the pilot light goes out. If it determines that the pilot light is off, it shuts down the flow of gas. Share this conversation. This happened once before, seven years ago. Today we’re going to talk about some of the most common reasons that a gas furnace pilot light would go out and what you should do if it happens to you! However this may have happened, you will need to relight it. Lighting a Pilot that is Electronic Ignition - This is one of many questions we get by email. Modern furnaces tend to have an electronic igniter or a hot surface igniter, and the pilot compartment is sealed, so you couldn't light the pilot with a match even if you wanted to. was working a few weeks ago. Pilot – Most furnaces have an automatic electronic ignition. If gas or propane flow to this pilot light is interrupted, even for a moment, the pilot light can go out and will need to be relit. In turn, the pilot lights the gas for the burners. The coil will glow but my burners won't light. If your furnace system is 10 years or older there’s a good chance that is only an 80% AFUE furnace and has a standing pilot light that needs to remain lit at all times. 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 your furnace does not have a pilot light, move on to the next step. This can happen with age. Thermocouples detect pilot lights by sensing the heat they produce. Step 6: If Your Furnace Won’t Turn On, Check Your Pilot Light. The furnace's electronic control board activates an electric igniter that uses a high-voltage spark to light the pilot. To light a pilot light, first turn the gas control valve to off and wait 5 to 10 minutes until all the gas fumes are gone. The igniter on my Rheem furnace won't light up. If it still won’t stay lit after several attempts, you may have a faulty thermocouple. The pilot can go out at any time for various reasons, relighting it is not hard will go through it step by step here, and we will go over all the components involved. How to Fix Your Pilot Light. An operational pilot light in your furnace means safety from the possibility of a gas leak. If it's on, you should be able to see a small flame. How to Tell if an Ignitor on a Gas Furnace Is Working. Can someone tell me what the problem is? The thermocouple detects the pilot light via sensors. Can hear fan motor come on then gas valve. If your furnace has a standing pilot light, make sure that it’s lit. Ignition doesn't occur, and the furnace won't go on; A spark is present, but the pilot won't light; Pilot lights, but the main burner doesn't come on; Burners ignite but turn off after a few seconds; Michael Interisano / Design Pics / Getty Images Troubleshooting a Hot Surface Ignitor (HSI) The hot surface ignitor (HSI) is the most commonly used electronic ignition system. All you need to do is locate the gas supply valve and rotate it in a counterclockwise direction to open it. If the pilot light will not stay lit, it needs to be fixed ASAP to supply heat to your home and for safety reasons.There are numerous things that may make the pilot light on your furnace to not stay lit. It could simply be that the thermocouple is bent. don't see any hint of pilot lite on or not. The furnace should start automatically. Pilot light assembly . Malfunctioning Thermocouple. Luckily any pilot light, be it in a furnace or a water heater, is actually a fairly simple component. 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