Furnace Repair Checklist
1. Inspect the Thermostat
To begin, make sure your thermostat is instructing your furnace to start.
- Replace the batteries if the screen is empty. If the digital screen is scrambled, the thermostat might need to be swapped out.
- Make certain that the switch is switched to “heat” as opposed to “off” or “cool.”
- Make sure the program is showing the right day and time and is set to “run.” If you’re having trouble getting out of the program, regulate the temperature by using the up/down arrows and holding the “hold” button. This will cause the furnace to start if thermostat is causing a problem.
- Increase the temperature setting to 5 degrees warmer than the temperature of the room.
If your heater hasn’t turned on within a couple minutes, make certain that it has power by moving the fan switch from “auto” to “on.” If the fan doesn’t begin to run, your furnace could be without power.
If you have a smart thermostat—like one designed by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting will depend on your model. Refer to the manufacturer’s website for assistance. If you aren’t able to get your Wi-Fi thermostat to work, call us at 937-845-1111 for heating and cooling service.
2. Examine Breakers and Switches
Next, check if your breaker and furnace switch are on.
- Look for your main electrical panel. If you have no idea where it is, search for a silver metal box in your basement, garage or closet.
- Make certain that your hands and feet aren’t moist in advance of opening the panel or breakers.
- Look for the breaker marked “furnace” or “heat,” and ensure it’s reading “on.” If the breaker has tripped, it will be in the middle or “off” area.
- Using one hand, steadily flip the breaker to the “on” position. If the breaker trips right away and pops back to “off,” don't try to reset it and contact a team member from Jent Mechanical LLC at 937-845-1111 right away.
No matter your furnace’s age or brand, it has at minimum one standard wall switch situated on or near it.
- Ensure the control is flipped up in the “on” placement. If it was turned off, it could take your furnace up to five minutes to start. (If you’re unsure where to locate your furnace, look in your basement, garage or utility closet. It might also be in a crawl space or attic.)
3. Replace the Air Filter
When it comes to heating issues, a dirty, full air filter is regularly the top offender.
If your filter is too dirty:
- Your heater won’t stay on, or it could get too hot from reduced airflow.
- Your energy expenses may increase because your furnace is running too often.
- Your heat might stop working prematurely because a dusty filter causes it to work overtime.
- Your heater can be disconnected from power if an extremely dirty filter results in a tripped breaker.
Depending on what type of heater you use, your air filter can be found in the interior of the blower compartment of your furnace, an attached filter case or wall-mounted return air grille.
To swap out your filter:
- Cut the power to your furnace.
- Take out the filter and angle it toward the light. If you can’t see light through it, use a new one.
- Insert the new filter with the arrow pointing toward the heating system to keep damage from happening.
Flat filters ought to be replaced every month, while pleated filters should last about three months. If you have children or pets, you may have to put in a new filter more often.
To make changing your filter smoother down the line, write with a permanent writing tool on your heating system exterior or ductwork to list the airflow direction and filter size.
4. Examine the Condensate Pan
Commonly known as drain pans, condensate pans capture water your heater draws from the air.
If moisture is dripping from within your furnace or its pan is overflowing, try these guidelines.
- If your pan contains a drain (look for a PVC pipe), check that it isn’t clogged. If it should be drained, drop in a special pan-cleaning tablet you can get at home improvement or hardware retailers.
- If your pan has a pump, take a look at the float switch. If the switch can’t be moved from the “up” position with standing water in the pan, contact us at 937-845-1111, because you will probably need a new pump.
5. Watch for Furnace Error Codes
If failures continue, take a look inside your furnace’s plastic window to confirm the blower motor’s status. Subject to the model, the light might also be attached on the outside of your heater.
If you note anything other than an uninterrupted, colored light or twinkling green light, reach us at 937-845-1111 for HVAC service. Your furnace might be emitting an error code that is calling for expert help.
6. Scrub the Flame Sensor
If your heater attempts to work but shuts off without blowing heated air, a dirty flame sensor could be responsible. When this happens, your furnace will attempt to turn on three times before a safety mechanism powers it down for about an hour.
If you feel okay with opening up your heater, cleaning your flame sensor is something you can do yourself. Or, one of our heating service specialists has the ability to complete it for you.
If you want to clean the sensor on your own, you should have:
- A 1/4” hex screwdriver or wrench
- Bit of light grit sandpaper, steel wool or emery cloth
- A fresh paper towel
- Shut off the heating system’s power by using its wall switch or breaker. If your gas valve isn’t electric, you have to shut off the gas as well.
- Remove the furnace’s front panel and trace the wire to the flame sensor.
- Unscrew the rod and use your sandpaper, steel wool or emery cloth to lightly clean the metal rod.
- Wipe off the rod with a paper towel.
- Put the sensor back in.
- Replace the furnace doors.
- Restore power to the furnace. It may proceed through a series of tests before resuming usual running. If your heating system doesn’t ignite, the sensor might need to be replaced or something else may be wrong. If this occurs, get in touch with us at 937-845-1111 for heating and cooling repair help.
7. Relight the Pilot Light
If you are using an outdated heating system, the pilot light could be turned off. To relight it, find the instructions on a sheet on your heater, or use these recommendations.
- Find the lever below your heating system labeled “pilot,” “on” and “off.”
- Move the switch to the “off” position.
- Wait at least five minutes to limit the possibility for creating a fire.
- Push the knob to “pilot.”
- Hold down the “reset” switch as you push the flame of a long lighter to the pilot light opening.
- Let go of the “reset” lever once the pilot light is lit.
If you have used the instructions twice and the pilot light still won’t burn or keep burning, contact us at 937-845-1111 for furnace service.
Check Your Fuel Source
Try using an additional gas appliance. If it doesn’t function, your natural gas source might be switched off, or you might have run out of propane.