When your furnace won’t start, doing your own furnace repair in Pocatello, Idaho, can feel pretty overwhelming.
Troubleshooting your furnace might feel like an intimidating process when your heat won’t power on. But it doesn’t have to be like that.
There are several time-saving, low-cost fixes you can do yourself to prevent 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 expert and live in Pocatello, Vogts Heating & Air can help you. We can repair most types of heating systems and also provide emergency furnace repair.
If it’s time for a new heating system, we also offer furnace installation.
While you’re talking with us, think about a regular furnace maintenance plan that might help you avoid problems in the future. We can tell you how frequently your furnace should be examined by one of our professionals.
Follow our easy guide below to get to work on troubleshooting your furnace. Most of these steps don’t require mechanical expertise.
Furnace Repair Checklist
1. Check the Thermostat
First, make sure your thermostat is telling your furnace to turn on.
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” 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 make 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 started 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 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 208-621-0129 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, 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.
Find 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 call a professional from Vogts Heating & Air at 208-621-0129 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 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 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 issues, a dirty, clogged air filter is often the top offender.
If your filter is too dirty:
- Your furnace won’t stay on, or it could overheat from restricted airflow.
- Your energy bills could increase because your furnace is turning on too often.
- Your furnace could stop working too soon 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 model 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:
- Turn off your furnace.
- Take out the filter and hold it up to the light. If you can’t see light through it, get a new one.
- Add 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 use a washable filter that will last about 10 years. If you have children or pets, you may have to change your filter more frequently.
To make the process smoother in the future, use a permanent marker on your furnace housing or ductwork to list the airflow direction and filter size.
4. Inspect 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’s clear. 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, take a look at the float switch. If the switch is stuck “up” with liquid in the pan, contact us at 208-621-0129, because you will probably need a new pump.
5. Check for Furnace Error Codes
If malfunctions persist, look 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 else besides a steady, colored light or blinking green light, call us at 208-621-0129 for HVAC service. Your furnace may be communicating an error code that requires 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 to blame. When this occurs, your furnace will attempt to ignite 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 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:
- 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.
- 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 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 could run through a sequence of checks before proceeding with regular operation. If your furnace doesn’t ignite, the sensor may need to be replaced or something else could be wrong. If this happens, contact us at 208-621-0129 for heating and cooling repair assistance.
7. 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, call us at 208-621-0129 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 208-621-0129 or contact us online. We’ll come out and figure out the problem.