Listen for the sound of the spark or watch for the hot surface ignitor to glow (see your owner’s manual).eval(ez_write_tag([[300,250],'hometips_com-leader-2','ezslot_7',625,'0','0'])); Next check and clean the furnace’s flame sensor. Tighten any loose panels. Browse Helpful Items on Amazon• Furnace Thermocouples• Thermostats• Furnace Filters• Furnace Motors. On an electronic-ignition furnace, turn down the thermostat or turn the power switch off and then on again to reset the ignition control module. Last, if these simple steps don’t work, have a furnace repair technician check out your system because either the blower isn’t working properly or the system is out of balance. Possible blockage in the burner venturi tube which houses your pilot feed tube. Electronic ignition occurs typically in one of two ways: intermittent pilot or hot surface ignition. Furnace Does Not Blow Air. If this is the case, properly shutting the door on your furnace may fix the problem. 4 Reset the blower motor. When you turn up a heater's thermostat, it sends a tiny electrical signal to the gas valve, prompting it to open and send gas to the burner, where the pilot ignites it. If you suspect a furnace gas leak, deal with this immediately! When the gas is off,  the valve’s oblong stem points perpendicular to the inlet pipe. For more about maintenance, see Maintenance Checklist for Central Heating Systems. Check the furnace’s ignition. The limit switch shuts off the furnace if the air in the plenum gets too hot. The cold returning air enters back through the air filter into the furnace to complete another heating loop. When it gets hot enough, the thermocouple signals that there is enough heat to burn the gas fuel being released into the appliance—and so it allows the gas to be released to the burners. Sometimes, pressing the reset button is all that is required to get your furnace working properly. This is generally a job for a professional.eval(ez_write_tag([[300,250],'hometips_com-large-mobile-banner-2','ezslot_6',606,'0','0'])); You can clear a clogged orifice with a piece of thin wire. 6 Check the pilot light. This often indicates a problem with a faulty or dirty flame sensor. Many of these are particular to more sophisticated high-efficiency condensing furnaces that use electronic ignition, and most homeowners prefer to call a service technician to deal with them. 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. Sometimes there is a humidifier mounted on the furnace or the return air ductwork. 2 Check the electrical circuit. If possible, also slide out the fan unit, clean each fan blade with a toothbrush, and then vacuum with a brush attachment on a vacuum cleaner. If the pilot light won’t stay lit, it’s possible that there is an issue with the thermocouple or ignition system. Here’s a few easy RV heater troubleshooting tips and basic repairs, to give you a helping hand. If it is set to Off or Auto, the furnace’s limit switch must be adjusted. You can find … So, another simple cause may be a breeze blowing out the pilot light and … amzn_assoc_region = "US"; 7. Follow the instructions in your owner’s manual. To avoid break downs, it pays to know how to maintain your furnace and fix it when something goes wrong. We would probably use a little bit of emory paper, but he cleans the sensor with a 5-dollar bill. What Is a High-Temperature Limit Switch on a Furnace? Be sure the furnace’s circuit breaker is on or that its fuse has not blown. 3 Be sure the room heating registers are open. Troubleshooting Indoor Vent Free Gas Wall Heaters, Stoves and Fireplaces. If your furnace’s motor runs but the blower doesn’t move air, the … Last, wait a minute or so, release it, and then turn it to On. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. Your gas- or oil-burning furnace must receive fuel to work. If the patio heater has an electronic ignition system, make sure that there is … If the motor has these, apply two to three drops of non-detergent motor oil into each port (you may have to remove a cover plate to do this). This post may contain affiliate links. If the gas odor is strong, immediately evacuate your house, leaving the door open. On a propane heater, the thermocouple will turn off the patio heaters gas supply, this is a safety on all gas appliances. With a full cylinder in place, turn on the gas, and listen at the burner attempting to hear the sound of the gas arriving. Look to these possible causes one at a time. Consequently, fixing becomes urgent very quickly.eval(ez_write_tag([[300,250],'hometips_com-medrectangle-3','ezslot_2',600,'0','0'])); The following instructions will help you do the fixing—or at least figure out what needs to be fixed. In the event that replacing the filter or checking these issues don’t solve the problem, call a furnace repair technician because oil-burning furnaces are complex to repair. If none of these measures do the trick, call an HVAC professional. If nothing happens, wait about 30 minutes for the motor to cool, and then try the Reset button again. Replace the fuse (be sure to follow the instructions in your owner’s manual). Replacing it is an easy fix. All too often, restoring the flow of warm air is simply a matter of opening heat registers. Lubricate if necessary. 3 Be sure the furnace’s power switch is turned on. If recommended by your maintenance manual, oil the bearings according to the manufacturer’s directions. 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