furnace repair

Sylmar is Getting Cold, but My Furnace Wont Turn On

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

There are several time-saving, reasonable fixes you can do on your own to skip 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 an expert and live in Sylmar, American Premier Heating & Air Conditioning can provide assistance to you. We repair most makes of heating systems.

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

While you’re in touch with us, think over a routine furnace maintenance plan from American Premier Heating & Air Conditioning that could help you avoid breakdowns in the future. We can tell you how frequently your furnace should be examined 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 know-how.

Steps for Furnace Troubleshooting

Check the Thermostat

To start, make sure your thermostat is instructing 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 appropriate 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 a problem.
  • Increase the temperature setting to 5 degrees warmer than the room temperature.
Digital Thermostat

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 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.
  • 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 American Premier Heating & Air Conditioning at 818-275-0897 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, it could take your furnace 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 breakdowns, a filthy, clogged air filter is regularly to blame.

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 increase because your furnace is turning on too often.
  • Your furnace could fail prematurely because a dirty filter causes it to work harder.
  • Your furnace can lose 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.
  • Take out the filter and hold it up to 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 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 put in a new filter more often.

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

Examine 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 clogged. 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, check the float switch. If the switch is stuck “up” with liquid in the pan, contact American Premier Heating & Air Conditioning at 818-275-0897, because you will probably need a new pump.

Peek Inside Your Furnace

If malfunctions persist, 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 else besides a steady, colored light or blinking green light, call American Premier Heating & Air Conditioning at 818-275-0897. Your furnace may be communicating an error code that requires professional help.

Clean the Flame Sensor

If your furnace tries to start but shuts off without distributing heat, a dirty flame sensor could be to blame. When this occurs, your furnace will try to start three times before a safety feature shuts 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 experts at American Premier Heating & Air Conditioning 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:

  • Shut 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.
  • Remove the furnace’s front panel and follow 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 sequence of checks before proceeding with usual operation. If your furnace doesn’t start, the sensor may need to be replaced or something else might be wrong. If this happens, contact American Premier Heating & Air Conditioning at 818-275-0897 for assistance.

Relight the Pilot Light

If you are using 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.

  • 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 sparking 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 American Premier Heating & Air Conditioning at 818-275-0897.

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.

American Premier Heating & Air Conditioning Can Help with Furnace Problems

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

Call us today at 818-275-0897 or use our online scheduler. We’ll come out and diagnose the problem.

*Required fields