Typically, the flame sensor comes in the form of a rod that can be found near the back of the furnace, right in the path of the burner. Pros recommend changing them once a month. Active 5 years, 7 months ago. Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. what type of furnace, electric, gas or oil? Dust and debris inside … If the boiler temperature is 140 degrees F. or higher your boiler is … Check fuses and the circuit breaker to ensure that power is getting to the furnace. The house was freezing, and my family was complaining, so I started phoning HVAC repair companies to schedule someone to fix it. Can’t remember the last time you changed your furnace’s air filter? Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. However, if you find yourself having to push the reset button pretty frequently, you will want to get to the root of the problem and figure out why the automatic shut off feature is being triggered. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. When your furnace is not working properly during freezing temperatures it can be extremely frustrating. If after you’ve performed all the diagnostics your furnace still won’t kick on, then you’ll want to call a professional. Hitting the button can be enough to get your furnace back up and working properly. If your older furnace utilizes a pilot light that won’t stay lit, the thermocouple may be loose or faulty, the pilot orifice may be clogged, the pilot’s flame may be set too low, or the safety cutoff valve may be defective. Check your thermostat when your furnace won’t start. The air conditioner works fine, as we used it last week. It is important to seal up any leaks or gaps so that hot air is directed into the home. If so, there is a good chance that the filter is too dirty to allow the furnace to work properly. Enter model number to search for the required part specific to your product. No, seriously. This button controls an automatic shut-off feature that shuts down the furnace if it gets too hot or if there are other problems. One of the most common reports homeowners have when their furnace will not ignite is the clicking sound of the furnace about to come on, but then silence and no … If you have an older furnace with a standing pilot light, it’s possible that the pilot light is extinguished. Look to these possible causes one at a time. To go farther you will need a voltmeter and the ability to use it. Be sure to change your air filter every month to improve indoor air quality and prevent furnace problems. For electric turn up the thermostat, for gas and oil make sure you have fuel. I had to use my emergency switch on the wall to turn off the furnace. Sometimes the pilot light can be snuffed out and will need to be relit so that the burners can produce heat. The owner's manual shows where the filter is and how to remove it. Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler, How to Troubleshoot and Repair an Electric Water Heater, Troubleshooting an Intermittent Pilot Ignition System. If you suspect that you are experiencing any of the common home furnace problems above, please don’t hesitate to give us a call. But the furnace will still need to be repaired before you can enjoy heat from it. However the heat registers were closed, if too many are shut, it can cause heat to build up in your furnace, causing it to shut down automatically. My heater is running, but no heat is coming out, just cold air. The first thing you want to do if your furnace won’t kick on is to check and see if the thermostat is set to heat and not the air conditioning function. Bridgeton, MO 63044, ©2017 Superior Heating and Cooling | Designed by: Yummy Image Media, Licensed, Bonded, & Insured | St. Charles Mechanical License #M2770B | St. Louis County Mechanical License #X5296, When Your Furnace Comes on but No Heat Comes out of Your Vents, When winter hits and the temperatures drop, the last thing you want is a furnace that seems to be working, but isn’t actually blowing hot air through the vents. I've tapped the flame rod. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. So, the furnace is getting power, the fan works when "ON." I can not figure out why my gas furnace pilot light is on but no heat is kicking on at all. All too often, restoring the flow of warm air is simply a matter of opening heat registers. Unaddressed, dirty furnace filters can cause extensive, and expensive, damage to your home’s heating system. Make sure the thermostat’s fan switch is on auto in order to prevent cool air from being fed into your home. A number of different problems in the furnace can trip this safety switch, including a malfunctioning blower, an overly dirty air filter, or a clogged flue. SHOP PARTS. Your first inclination will likely be to call a repair service. All RV furnaces operate on battery power alone, so you don’t need to plug into the mains or run a generator. 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