When your furnace won’t start, doing your own furnace repair in Port St. Lucie, Florida, can feel pretty overwhelming.

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 a few quick, 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 contacting an HVAC professional.

If you find you need help from a heating and cooling pro and live in Port St. Lucie, Custom Air Systems Inc can help you. We can repair most types of heating systems and also provide emergency furnace repair.

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

While you’re chatting with us, think about a regular furnace maintenance plan that might help you avoid breakdowns in the future. We can tell you how frequently your furnace should be inspected by one of our certified pros.

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

Furnace Repair Checklist

1. Check the Thermostat

First, make sure your thermostat is signaling your furnace to ignite.

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 set to the correct day and time and is set to “run.” If you’re having problems overriding the program, set the temperature by using the up/down arrows and press the “hold” button. This will make the furnace to turn on 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 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. Check the manufacturer’s website for help. If you still can’t get your Wi-Fi thermostat to work, call us at 772-247-2283 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 have no idea 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 Custom Air Systems Inc at 772-247-2283 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 close to 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, take a look at 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 filthy, clogged air filter is often the top offender.

If your filter is too dirty:

  • Your furnace won’t keep heating your home, or it could overheat from limited airflow.
  • Your energy bills could go up because your furnace is turning on too often.
  • Your furnace could break down sooner than it should because a dirty filter causes it to overwork.
  • Your furnace can be cut off 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.

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, get a new one.
  3. Add 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 get a washable filter that will last about 10 years. If you have children or pets, you may have to replace your 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.

4. Inspect the Condensate Pan

Also known as drain pans, condensate pans catch water your furnace removes 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’s clear. If it needs to be drained, use a special pan-cleaning tablet you can purchase 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 us at 772-247-2283, because you will possibly 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 mounted on the outside of your furnace.

If you see anything other than a steady, colored light or blinking green light, call us at 772-247-2283 for HVAC service. Your furnace may be communicating an error code that needs professional service.

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 start 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 on your own. 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:

  • 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 track 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 go through a series of checks before resuming 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 us at 772-247-2283 for heating and cooling repair assistance.

7. 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.

  • 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 starting a fire.
  • Turn the knob to “pilot.”
  • Hold down 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 772-247-2283 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 772-247-2283 or contact us online. We’ll come out and figure out the problem.

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