When your furnace won’t start, doing your own furnace repair in West Jefferson, Ohio, can feel pretty overwhelming.

Troubleshooting your furnace might feel like a challenging job when your heat won’t start. But it doesn’t have to be like that.

There are a number of time-saving, reasonable fixes you can do yourself to avoid a furnace repair call.

If your furnace won’t turn on, won’t stay on or won’t ignite, try the troubleshooting list below before contacting an HVAC professional.

If you find you need help from a heating and cooling professional and live in West Jefferson, West Jefferson Plumbing and Heating, Inc. can help you. We can repair most brands of heating systems and also provide emergency furnace repair.

If you’re ready for a new heating system, we also offer furnace installation.

While you’re talking with us, consider an annual furnace maintenance plan that may help you avoid repairs in the future. We can tell you how often your furnace should be inspected by one of our NATE-Certified professionals.

Go through our easy guide below to start troubleshooting your furnace. Most of these steps don’t require mechanical know-how.

Furnace Repair Checklist

1. Check the Thermostat

To start, make sure your thermostat is instructing your furnace to ignite.

Digital Thermostat

Swap out the batteries if the screen is blank. If the digital screen is jumbled, the thermostat may need to be replaced.

Make sure the switch is set to “heat” as opposed to “off” or “cool.”

Ensure the program is set to the right day and time and is set to “run.” If you’re having trouble overriding the program, set the temperature by using the up/down arrows and press the “hold” button. This will force the furnace to start if thermostat programming is causing trouble.

Increase the temperature setting to 5 degrees warmer than the room temperature.

If your furnace hasn’t started within a couple minutes, make sure it has power by toggling the fan switch from “auto” to “on.” If the fan doesn’t begin to run, your furnace might not have power.

Smart Thermostat

If you have a smart thermostat—like one made by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting is very model-specific. Check the manufacturer’s website for help. If you still can’t get your Wi-Fi thermostat to work, call us at 614-879-9091 for heating and cooling service.

2. Examine Breakers and Switches

Next, you will need to check if your breaker and furnace switch are on.

Locate your house’s main electrical panel. If you have no idea where it is, keep an eye out for a gray metal box in your basement, garage or closet.

Make sure your hands and feet are dry before touching the panel or breakers.

Find the breaker labeled “furnace” or “heat,” and make sure it’s switched “on.” If the breaker has tripped, it will be in the middle or “off” position.

Using one hand, firmly switch the breaker to the “on” position. If the breaker immediately trips and pops back to “off,” don’t touch it and call a professional from West Jefferson Plumbing and Heating, Inc. at 614-879-9091 right away.

No matter your furnace’s age or brand, it has at least one standard wall switch located on or by it.

Make sure the switch is flipped up in the “on” position. If it was turned off, expect your furnace to take up to five minutes to ignite. (If you don’t know where to find your furnace, look in your basement, garage or utility closet. It could also be in a crawl space or attic.)

3. Replace the Air Filter

When it comes to furnace issues, a filthy, clogged air filter is frequently the top offender.

If your filter is too dirty:

  • Your furnace won’t be able to stay on, or it could overheat from limited airflow.
  • Your energy bills could go up because your furnace is turning on too often.
  • Your furnace could break down too soon because a dirty filter causes it to work harder.
  • Your furnace can be disconnected from power if an extremely dirty filter causes the breaker to trip.

Depending on what type of furnace you own, your air filter will be inside the blower compartment of your furnace, an attached filter case or wall-mounted return air grille.

To replace your filter:

  1. Turn off your furnace.
  2. Take out the filter and hold it up to the light. If you can’t see light through it, replace it.
  3. Put in the new filter with the arrow pointing toward the furnace to avoid damage.

Flat filters should be replaced once a month, while pleated filters should last about three months. You can also use a washable filter that will last about 10 years. If you have children or pets, you may have to replace your filter more frequently.

To make the process smoother in the future, use a permanent marker on your furnace housing or ductwork to list the airflow direction and filter size.

4. Inspect the Condensate Pan

Commonly known as drain pans, condensate pans catch water your furnace draws from the air.

If water is seeping out of your furnace or its pan has standing water in it, follow these steps.

  • If your pan has a drain (look for a PVC pipe), check that it isn’t full. If it needs to be drained, use a special pan-cleaning tablet you can purchase at home improvement or hardware stores.
  • If your pan contains a pump, inspect the float switch. If the switch is stuck “up” with standing water in the pan, contact us at 614-879-9091, because you will likely need a new pump.

5. Check for Furnace Error Codes

If malfunctions persist, look inside your furnace’s plastic window to confirm the status of the blower motor. Depending on the model, the light could also be fixed on the outside of your furnace.

If you see anything else besides a steady, colored light or blinking green light, call us at 614-879-9091 for HVAC service. Your furnace may be emitting an error code that needs professional service.

6. Clean the Flame Sensor

If your furnace tries to start but shuts off without blowing heat, a dirty flame sensor could be responsible. When this takes place, your furnace will attempt to ignite three times before a safety feature powers it down for about an hour.

If you feel comfortable with opening up your furnace, cleaning your flame sensor is something you can do by yourself. Or, one of our heating service specialists can do it for you.

If you want to clean the sensor yourself, you’ll need:

  • A 1/4” hex screwdriver or wrench
  • Piece of light grit sandpaper, steel wool or emery cloth
  • A dry, clean paper towel

Next:

  • Disable the furnace’s power by using its wall switch or breaker. If your gas valve is not electric, you will need to shut off the gas as well.
  • Lift off the furnace’s front panel and track the wire to the flame sensor.
  • Unscrew the rod and use your sandpaper, steel wool or emery cloth to gently rub the metal rod.
  • Wipe off the rod with a paper towel.
  • Remount the sensor.
  • Replace the furnace doors.
  • Turn the furnace’s power back on. It may proceed through a set of checks before proceeding with normal operation. If your furnace doesn’t turn on, the sensor may need to be replaced or something else may be wrong. If this happens, call us at 614-879-9091 for heating and cooling repair assistance.

7. Relight the Pilot Light

If you own an older furnace, the pilot light could be out. To relight it, find the instructions on a label on your furnace, or follow these steps.

  • Find the switch on the bottom of your furnace labeled “pilot,” “on” and “off.”
  • Turn the switch to the “off” position.
  • Wait at least five minutes to avoid possibly creating a fire.
  • Turn the knob to “pilot.”
  • Hold down the “reset” button as you bring the flame of a long lighter to the pilot light opening.
  • Release the “reset” button once the pilot light is lit.

If you have followed the instructions twice and the pilot light still won’t light or stay lit, call us at 614-879-9091 for furnace service.

Check Your Fuel Source

Try switching on another gas appliance. If it doesn’t work, your natural gas service could be turned off, or you could be out of propane.

We Can Help with HVAC Repair

Followed our troubleshooting guide but your furnace still won’t work?

Call us today at 614-879-9091 or contact us online. We’ll come out and figure out the problem.