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How do you troubleshoot a Lennox Furnace?
Aug 1, 2023 · A good gas furnace troubleshooting guide assists you in determining what is wrong with the furnace based on its symptoms. That’s what we do here with clear, straightforward information with links to videos where helpful.
- Furnace Blowing Cold Air? Common Causes and How to Fix Them
Other furnace brands will have different codes to indicate...
- Furnace Blowing Cold Air? Common Causes and How to Fix Them
5 days ago · Troubleshooting furnace problems can seem daunting, but breaking it down into simple steps makes it manageable. From checking the thermostat and inspecting the air filter to examining the pilot light and listening for unusual noises, these steps can help you identify and sometimes even fix common furnace issues.
- Furnace Repair – The Basics. Your furnace is probably the most important appliance in your home. Unless you live somewhere that doesn’t get cold, ever, then, it’s literally the device that makes your house livable, along with the running water.
- Check the Thermostat. Before you assume you have a furnace problem, do some furnace troubleshooting and check the thermostat to make sure it’s actually telling the furnace to come on.
- Check the Breaker and Shut Off Switches. It sounds unbelievable, but furnace technicians often find that the only “repair” a furnace needs is to be turned on.
- Change the Furnace Filter. A clogged furnace filter can cause a furnace to shut off. Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up.
- Step 1: Make Sure The Thermostat Is Set to “Heat.”
- Step 2: Assess If It’S Time to Change Your Furnace Filter.
- Step 3: Check The Battery.
- Step 4: Confirm That Your Furnace Is Getting Power.
- Step 5: If The Machine Doesn’T Power ON, Check The Circuit Breaker.
- Step 6: Throw Another Switch, This One Located Near The furnace.
- Step 7: Look For A Code That Indicates The problem.
- Step 8: on An Older Model, You May Need to Relight The Furnace’s Pilot Light.
- Step 9: If All Else Fails, Check The Gas Valve.
- Prevent Trouble with A Periodic HVAC Inspection.
“This sounds obvious, but it’s true: A lot of people don’t have their thermostat set right,” says Bobby Difulgentiz, director of product management for Lennox International. So the first step in troubleshooting your furnace is to double-check that the thermostat is set correctly. “Many thermostats have to be physically set to “Heat,” Difulgentiz sa...
Filter-related failures are probably one of the most common furnace problems out there, primarily because homeowners forget about the filters, says Difulgentiz. Filters clean the air headed into the furnace and the heated air sent back into the house. A dirty, clogged filter limits the airflow, eventually causing heat and pressure to build up in th...
Some thermostats are wired to the house’s electrical system, while others use batteries. How is yours powered? Sometimes those that use batteries will flash a low-battery symbol when they need a replacement, but the signal often goes unnoticed, says Bonner.
You need to know if the furnace is getting electricity, so check. Most thermostats have a switch for the fan that says either “On” or “Auto” (which means that the fan turns on when the equipment comes on). Throw the switch to “On.” “If the fan comes on, then you know you’ve got power to the furnace. If it doesn’t, you know you’ve got other problems...
Still haven’t found the problem? Here’s the next step in furnace troubleshooting: Go to your home’s breaker panel and look for the circuit that controls the furnace. You’re looking to see whether it’s thrown to the “Off” position, or whether it’s in the middle because your circuit breaker was tripped. (In some panels the switch shows red.) Some ele...
Furnaces have another switch, simply known as the “furnace switch.” It’s a power switch that often looks like a regular light switch. It can be located either on the unit or—because electricians often work before the furnace is installed—on a wall nearby. Often this switch is unlabeled. If installed correctly, the switch in the up position is “On.”...
Furnaces built about 1990 or later have a tiny window where a light shows through. That light can not only tell you whether the furnace has power, but it can also flash a code to help you know what’s going on. If you’ve flipped the furnace switch off, then back on, note the sequence of the flashing light. Then open the furnace’s access panels (ther...
“If your furnace has a pilot light—anything less than 20 years old won’t—there are instructions in your owner’s manual for how to relight the pilot,” says Bonner. A modestly capable homeowner should be able to do it. You’re dealing with fire, however, so don’t do anything you’re not comfortable with.
If all else fails, check the furnace’s gas valve to make sure that it hasn’t somehow been turned to the “Off ” position. Any gas furnace has a “gas cock” that has to be located within six feet of the furnace, Bonner says. This is usually never touched, but you could check it. Another way to double-check: If you have more than one gas appliance, fin...
So when should you give up troubleshooting your furnace yourself and call in the cavalry? That point varies for every homeowner. “When you get uncomfortable, call somebody,” Bonner says. An ounce of prevention is worth a pound of cure: Lennox’s Difulgentiz recommends that someone come out twice a year—in spring to check on the air conditioner befor...
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- General Furnace Maintenance. For starters, once a year, vacuum out the area around the furnace’s blower. 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.
- Furnace Not Working—No Gas Flame. Older gas and combustion-fuel furnaces have pilot lights, whereas some newer ones have electronic ignition. How to Relight a Pilot Light and Check Thermocouple.
- Heating or Cycling Problems. If your furnace runs and provides some heat but not enough. 1 Be sure nothing is blocking the flow of warm air, including drapes, furniture, and the like.
- Furnace Does Not Blow Air. If your furnace’s motor runs but the blower doesn’t move air, the belt that connects the two probably has broken. Replacing it is an easy fix.
Oct 21, 2024 · Step-by-step DIY guide to furnace troubleshooting the 22 most common issues, like no heat, strange noises, or uneven heating.
What to do if a furnace blower won’t stop running. When the blower on a furnace won’t shut off, the first thing to check is that the thermostat is set to ON, and not to AUTO. If that isn’t the issue, the next most likely cause is a faulty relay.
