When your furnace won’t start, doing your own furnace repair in Zelienople, Pennsylvania, can feel pretty overwhelming.

Fixing your furnace might feel like an intimidating undertaking when your heat won’t turn on. But it doesn’t have to be like that.

There are several time-saving, low-cost 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 calling an HVAC professional.

If you find you need help from a heating and cooling professional and live in Zelienople, Knoechel Heating can provide assistance to you. We can repair most makes of heating systems and also provide emergency furnace repair.

If you need a new heating system, we also provide furnace installation.

While you’re in touch with us, consider a regular furnace maintenance plan that may help you avoid problems in the future. We can tell you how often your furnace should be examined by one of our NATE-Certified professionals.

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

Furnace Repair Checklist

1. Check the Thermostat

To begin, make sure your thermostat is telling your furnace to start.

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 displaying the correct 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 cause the furnace to turn on if thermostat programming is causing a problem.

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

If your furnace hasn’t turned on within a couple minutes, make sure it has power by toggling the fan switch from “auto” to “on.” If the fan doesn’t start, your furnace could be without power.

Smart Thermostat

If you have a smart thermostat—like one made by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting is very model-specific. Take a look at the manufacturer’s website for help. If you still can’t get your Wi-Fi thermostat to work, call us at 724-425-5852 for heating and cooling service.

2. Examine Breakers and Switches

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

Find your house’s main electrical panel. If you don’t know where it is, look 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.

Look for 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,” leave it alone and get in touch with a professional from Knoechel Heating at 724-425-5852 right away.

It doesn’t matter how old your furnace is or what brand it is, 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, anticipate your furnace could take up to five minutes to start. (If you don’t know where to find your furnace, check 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 grungy, clogged air filter is often to blame.

If your filter is too dirty:

  • Your furnace won’t keep heating your home, or it could overheat from reduced airflow.
  • Your energy bills could increase because your furnace is turning on more than it should.
  • Your furnace could stop working sooner than it should because a dirty filter causes it to work harder.
  • Your furnace can be cut off from power if an excessively dirty filter causes the breaker to trip.

Depending on what make of furnace you own, your air filter can be found 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. Pull out the filter and angle it toward the light. If you can’t see light through it, use a new one.
  3. Install the new filter with the arrow pointing toward the furnace to avoid damage.

Flat filters should be replaced monthly, 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 go more quickly 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

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

If water is dripping 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 get at home improvement or hardware stores.
  • If your pan has a pump, take a look at the float switch. If the switch is stuck “up” with liquid in the pan, contact us at 724-425-5852, because you will probably need a new pump.

5. Check for Furnace Error Codes

If malfunctions keep on happening, take a look inside your furnace’s plastic window to confirm the status of the blower motor. Depending on the model, the light could also be attached on the outside of your furnace.

If you see anything other than a steady, colored light or blinking green light, call us at 724-425-5852 for HVAC service. Your furnace may be giving an error code that requires professional assistance.

6. Clean the Flame Sensor

If your furnace tries to start but turns off without distributing heat, a dirty flame sensor could be responsible. When this occurs, your furnace will attempt to turn on 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 yourself. Or, one of our heating service experts 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:

  • Turn off 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.
  • Take off the furnace’s front panel and trace the wire to the flame sensor.
  • Unscrew the rod and use your sandpaper, steel wool or emery cloth to lightly 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 run through a series of checks before proceeding with regular operation. If your furnace doesn’t ignite, the sensor may need to be replaced or something else might be wrong. If this happens, contact us at 724-425-5852 for heating and cooling repair assistance.

7. Relight the Pilot Light

If you have 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.

  • Look for 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.”
  • Push 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, get in touch with us at 724-425-5852 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 724-425-5852 or contact us online. We’ll come out and figure out the problem.

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