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

Troubleshooting your furnace might feel like an overwhelming job when your heat won’t power on. But it doesn’t have to be like that.

There are a few time-saving, reasonable 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 getting in touch with an HVAC professional.

If you find you need help from a heating and cooling pro and live in Buellton, Allstar Heating & Air Conditioning can help you. We can repair most makes of heating systems and also provide emergency furnace repair.

If it’s time for a new heating system, we also do furnace installation.

While you’re in touch with us, think about an annual furnace maintenance plan that may help you avoid problems 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 expertise.

Furnace Repair Checklist

1. Check the Thermostat

To begin, make sure your thermostat is instructing your furnace to turn on.

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” instead of “off” or “cool.”

Ensure the program is displaying 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 ignite if thermostat programming is causing trouble.

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

If your furnace hasn’t turned on within few 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. 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 805-242-9638 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, search 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 call a professional from Allstar Heating & Air Conditioning at 805-242-9638 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, 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 problems, a dirty, clogged air filter is frequently the top offender.

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 go up because your furnace is turning on more often.
  • Your furnace could stop working prematurely 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 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. Pull out the filter and angle it toward the light. If you can’t see light through it, replace it.
  3. Insert 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 get a washable filter that will last about 10 years. If you have children or pets, you may have to replace your filter sooner.

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

4. Inspect the Condensate Pan

Commonly known as drain pans, condensate pans hold water your furnace pulls 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’s clear. If it needs to be drained, use a special pan-cleaning tablet you can buy at home improvement or hardware stores.
  • If your pan uses a pump, inspect the float switch. If the switch is stuck “up” with water in the pan, contact us at 805-242-9638, because you will likely need a new pump.

5. Check for Furnace Error Codes

If malfunctions persist, peek inside your furnace’s plastic window to verify 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 other than a steady, colored light or blinking green light, call us at 805-242-9638 for HVAC service. Your furnace may be emitting an error code that is calling for professional assistance.

6. Clean the Flame Sensor

If your furnace tries to start but shuts off without putting out heat, a dirty flame sensor could be at fault. When this occurs, your furnace will attempt to turn on three times before a safety feature turns it off 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 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.
  • Take 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 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 could proceed through a set of checks before continuing regular operation. If your furnace doesn’t ignite, the sensor may need to be replaced or something else could be wrong. If this happens, call us at 805-242-9638 for heating and cooling repair assistance.

7. Relight the Pilot Light

If you have an older furnace, the pilot light could be turned off. 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.”
  • 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, call us at 805-242-9638 for furnace service.

Check Your Fuel Source

Try turning 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 805-242-9638 or contact us online. We’ll come out and pinpoint the problem.

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