When your furnace won’t start, doing your own furnace repair in Athol, Idaho, can feel pretty overwhelming.
Fixing your furnace might feel like an overwhelming process when your heat won’t turn on. But it doesn’t have to be like that.
There are a couple of time-saving, inexpensive fixes you can do yourself 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 getting in touch with an HVAC professional.
If you find you need help from a heating and cooling expert and live in Athol, Alpine Summit Heating & Cooling can help you. We can repair most makes of heating systems and also provide emergency furnace repair.
If you need a new heating system, we also offer furnace installation.
While you’re chatting with us, consider a routine furnace maintenance plan that might help you avoid problems in the future. We can tell you how frequently your furnace should be inspected by one of our professionals.
Use our easy guide below to get started on troubleshooting your furnace. Most of these steps don’t require mechanical know-how.
Furnace Repair Checklist
1. Check the Thermostat
To begin, make sure your thermostat is signaling 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” 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 problems 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 an issue.
Increase the temperature setting to 5 degrees warmer than the room temperature.
If your furnace hasn’t turned on within several minutes, make sure it has power by toggling the fan switch from “auto” to “on.” If the fan doesn’t 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 208-561-1226 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, 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,” don’t touch it and contact a professional from Alpine Summit Heating & Cooling at 208-561-1226 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, it could take your furnace up to five minutes to turn on. (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 to blame.
If your filter is too dirty:
- Your furnace won’t stay on, or it could overheat from limited airflow.
- Your energy bills could go up because your furnace is turning on more often.
- Your furnace could break down prematurely because a dirty filter causes it to work overtime.
- Your furnace can be cut off from power if an overly dirty filter causes the breaker to trip.
Depending on what make of furnace you have, your air filter can be found 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 angle it toward the light. If you can’t see light through it, replace it.
- 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 frequently.
To make the process smoother 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 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 has a pump, take a look at the float switch. If the switch is stuck “up” with standing water in the pan, contact us at 208-561-1226, because you will possibly need a new pump.
5. Check for Furnace Error Codes
If malfunctions persist, take a 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 except a steady, colored light or blinking green light, call us at 208-561-1226 for HVAC service. Your furnace may be communicating an error code that is calling for professional help.
6. Clean the Flame Sensor
If your furnace tries to start but turns off without putting out heat, a dirty flame sensor could be to blame. When this happens, your furnace will try to ignite 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 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:
- 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 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 usual operation. If your furnace doesn’t turn on, the sensor may need to be replaced or something else may be wrong. If this happens, contact us at 208-561-1226 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.
- 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 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, get in touch with us at 208-561-1226 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 208-561-1226 or contact us online. We’ll come out and figure out the problem.