furnace repair

Perry is Getting Cold, but My Furnace Wont Turn On

Fixing your furnace might feel like a daunting chore when your heat won’t turn on. But it doesn’t have to be like that.

There are several time-saving, inexpensive fixes you can do by 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 someone who is experienced and live in Perry, Gillman Heating and Air can provide assistance to you. We work on most types of heating systems.

If you need a new heating system, we also offer furnace replacement in Perry.

While you’re chatting with us, think about an annual furnace maintenance plan from Gillman Heating and Air that could help you avoid repairs in the future. We can tell you how frequently your furnace should be checked by one of our NATE-certified specialists.

Go through our easy guide below to get to work on troubleshooting your furnace. Most of these steps don’t require mechanical abilities.

Steps for Furnace Troubleshooting

Check the Thermostat

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

If you have a digital thermostat:

  • Change 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” rather than “off” or “cool.”
  • Ensure the program is set to 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 ignite if thermostat programming is causing trouble.
  • Increase the temperature setting to 5 degrees warmer than the room temperature.
Digital Thermostat

If your furnace hasn’t kicked on 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 may not have power.

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, contact us for assistance.

Lennox Smart Thermostat

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, 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.
  • Locate 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 contact a professional from Gillman Heating and Air at 478-202-3076 right away.

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

Replace Your Furnace’s Air Filter

When it comes to furnace issues, a dirty, clogged air filter is regularly the top culprit.

If your filter is too dirty:

  • Your furnace won’t stay on, or it could overheat from limited airflow.
  • Your energy bills could go up because your furnace is turning on more than it should.
  • Your furnace could break down prematurely because a dirty filter causes it to work overtime.
  • Your furnace can be disconnected from power if an overly dirty filter causes the breaker to trip.

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

Replacing a furnace filter

To replace your filter:

  • Turn off your furnace.
  • Pull out the filter and hold it up to the light. If you can’t see light through it, get a new one.
  • 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 buy a washable filter that will last about 10 years. If you have children or pets, you may have to put in a new filter more frequently.

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

Examine the Condensate Pan

Also known as drain pans, condensate pans hold water your furnace pulls 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, take a look at the float switch. If the switch is stuck “up” with water in the pan, contact Gillman Heating and Air at 478-202-3076, because you will likely need a new pump.

Peek Inside Your Furnace

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

If you see anything other than a steady, colored light or blinking green light, call Gillman Heating and Air at 478-202-3076. Your furnace may be giving an error code that requires professional assistance.

Clean the Flame Sensor

If your furnace tries to start but shuts off without putting out heat, a dirty flame sensor could be responsible. When this happens, your furnace will make an 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 HVAC specialists at Gillman Heating and Air 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.
  • Lift 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 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 might proceed through a set of checks before proceeding with usual 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 Gillman Heating and Air at 478-202-3076 for assistance.

Relight the Pilot Light

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

  • Locate 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 starting 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, call Gillman Heating and Air at 478-202-3076.

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.

Gillman Heating and Air Can Help with Furnace Problems

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

Call us today at 478-202-3076 or use our online scheduler. We’ll come out and pinpoint the problem.

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