furnace repair

Payson is Getting Cold, but My Furnace Wont Turn On

Figuring out a furnace-related problem might feel like a daunting task when your heat won’t work. But it doesn’t have to be like that.

There are a few fast, inexpensive fixes you can do on your own 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 an expert and live in Payson, North Mechanical Heating and Cooling can provide assistance to you. We repair most makes of heating systems.

If you’re ready for a new heating system, we also provide furnace replacement in Payson.

While you’re in touch with us, think about a regular furnace maintenance plan from North Mechanical Heating and Cooling that might help you avoid repairs in the future. We can tell you how regularly your furnace should be inspected by one of our NATE-certified specialists.

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

Steps for Furnace Troubleshooting

Check the Thermostat

First, make sure your thermostat is telling your furnace to turn on.

If you have a digital thermostat:

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

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, 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.

  • Locate your house’s main electrical panel. If you have no idea 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.
  • 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,” don’t touch it and contact a professional from North Mechanical Heating and Cooling at 928-263-8570 right away.

Regardless of your furnace’s age or brand, it has at least one standard wall switch located on or close to 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, check 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 problems, a dirty, clogged air filter is often the top offender.

If your filter is too dirty:

  • Your furnace won’t be able to stay on, or it could overheat from restricted airflow.
  • Your energy bills could go up because your furnace is turning on too often.
  • Your furnace could fail sooner than it should because a dirty filter causes it to overwork.
  • Your furnace can be disconnected from power if an extremely dirty filter causes the breaker to trip.

Depending on what type 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 tilt it toward the light. If you can’t see light through it, use a new one.
  • Put in the new filter with the arrow pointing toward the furnace to avoid damage.

Flat filters should be replaced every month, 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 change your filter sooner.

To make the process easier in the future, use a permanent marker on your furnace housing or ductwork to list 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 get at home improvement or hardware stores.
  • If your pan uses a pump, take a look at the float switch. If the switch is stuck “up” with water in the pan, contact North Mechanical Heating and Cooling at 928-263-8570, because you will probably need a new pump.

Peek Inside Your Furnace

If malfunctions persist, look inside your furnace’s plastic window to check 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 North Mechanical Heating and Cooling at 928-263-8570. Your furnace may be emitting an error code that requires professional service.

Clean the Flame Sensor

If your furnace tries to start but switches off without distributing heat, a dirty flame sensor could be to blame. When this takes place, your furnace will make an attempt to start 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 on your own. Or, one of our HVAC experts at North Mechanical Heating and Cooling 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 carefully 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 go through a sequence of checks before continuing normal operation. If your furnace doesn’t ignite, the sensor may need to be replaced or something else could be wrong. If this happens, contact North Mechanical Heating and Cooling at 928-263-8570 for assistance.

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.

  • 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 creating a fire.
  • Turn the knob to “pilot.”
  • Press 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, contact North Mechanical Heating and Cooling at 928-263-8570.

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.

North Mechanical Heating and Cooling Can Help with Furnace Problems

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

Call us today at 928-263-8570 or use our online scheduler. We’ll come out and figure out the problem.

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