A dirty filter, which can also cause whistling.A leak in the furnace cabinet, sheet metal plenum or ductwork near the furnace that must be tightened.A bad bearing in the draft motor or the blower motor that must be replaced.The furnace being a single-stage model that runs on high capacity all the time, so it’s going to be loud.Air ducts are leaking, sometimes producing telltale whistling noises, and it is time to have them sealed as recommended by Energy StarĪ noisy furnace is most often the result of:.The filter is installed backwards, an issue that can be checked by looking for the arrows on the filter frame that show proper installation direction with the flow of air.The filter is the wrong type for your furnace and restricts airflow, so should be replaced.A dirty filter that must be washed (only if the washable type) or replaced.If it runs constantly but isn’t providing enough heat, the likely causes are: If your furnace is properly sized for your home, then it should keep your home warm even in extreme cold. The Furnace Runs but Can’t Keep the House Warm The problem, in this case, is either that the motor is bad or the capacitor that supports it is bad. This video will assist you in troubleshooting draft motor issues and what is causing them.Ĩ. One of the issues discussed above with gas, gas valve and ignitor must be addressed.A blocked air intake or blocked exhaust chimney (snow, debris and bird’s nests are common causes) must be cleared.The motor or the board that controls it has failed and must be replaced.If it starts and then the furnace shuts down, the cause might be: It pulls hot combustion gases through the furnace and out the exhaust stack. The draft motor is also called the inducer motor. The Draft Motor Runs, Furnace Won’t Start
MONCRIEF FURNACE TROUBLESHOOTING HOW TO
Gas Furnace Blowing Cold Air? Common Causes and How to Fix Themģ.The draft motor isn’t functioning or the fresh-air intake is blocked, perhaps by snow or debris, and needs to be cleared.
The ignitor is failing and must be replaced. The gas control valve isn’t opening and must be replaced. The gas is turned off, so check the gas cock near the furnace to make sure it is parallel to the gas line, its position when the. If the fan comes on, then the furnace is getting power. If the furnace won’t produce heat, you can check to see if it is getting power by moving the fan switch from the “Auto” position to the “On” position. The furnace’s main circuit board/control board is bad, an issue that can be diagnosed by an HVAC technician is nothing else solves the issue. The filter is dirty and must be replaced or cleaned, an issue that is especially true on newer furnaces that are equipped to shut down if the filter isn’t allowing adequate air flow, a condition that can cause serious mechanical failure. The thermostat needs fresh batteries, if battery-powered, or it is bad and must be replaced, an issue that can be diagnosed using an electrical multimeter that shows if a circuit is complete. The thermostat isn’t working, and this is sometimes caused by a wire coming loose, so check the wiring connections. The thermostat isn’t set to “heat,” which is easy to check and remedy. The circuit breaker is off, and if the circuit continues to trip after it is turned back on, there is likely a wiring short in the furnace. The furnace switch (located on or near the furnace, looks like a common light switch) is turned off and simply needs to be turned on, though the furnace might have a short delay before starting. If nothing happens when the thermostat is set above the home’s current temperature, the most likely causes are these: Note: This guide covers the most common problems, especially those most homeowners can easily check with no tools or basic tools such as screwdrivers and a multimeter. Knowledge is protection against being taken advantage of – though most repair professionals have sound ethics. Troubleshooting Common Gas Furnace ProblemsĮvery year, thousands of homeowners ask, “What’s wrong with my gas furnace?” If you’re in that situation, this guide will arm you with information before you call a furnace company. How to Choose a Gas Furnace Repair Expert. The Air Coming from the Furnace Smells Bad 7. Why Does the Furnace Keep Shutting Off. The Flame Starts, but the Furnace Shuts Down Troubleshooting Common Gas Furnace Problems.
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