Furnace Repair Checklist
1. Look at the Thermostat
First, ensure your thermostat is instructing your furnace to turn on.
- Replace the batteries if the screen is empty. If the digital monitor is messed up, the thermostat may need to be swapped out.
- Make certain that the button is switched to “heat” instead of “off” or “cool.”
- Make sure the program is showing the appropriate day and time and is scheduled to “run.” If you’re having problems overriding the schedule, adjust the temperature by using the up/down arrows and using the “hold” button. This will cause the furnace to start if thermostat is causing a problem.
- Turn the temperature setting to 5 degrees above the room temperature.
If your heat hasn’t turned on within a few minutes, make certain that it has electricity by moving the fan switch from “auto” to “on.” If the fan doesn’t start, your heating system might not have power.
If you utilize a smart thermostat—for example one designed by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting will be determined by the model you have. Take a look at the manufacturer’s website for help. If you aren’t able to get your Wi-Fi thermostat to work, reach us at 601-292-9763 for heating and cooling service.
2. Check Breakers and Switches
Next, check if your breaker and furnace switch are on.
- Find your main electrical panel. If you don’t know where it is, look for a gray metal box in your basement, garage or closet.
- Ensure your hands and feet are dry before using the panel or breakers.
- Find the breaker marked “furnace” or “heat,” and make sure it’s turned “on.” If you discover a tripped breaker, it will be in the middle or “off” position.
- With one hand, firmly flip the breaker to the “on” position. If the breaker immediately trips and pops back to “off,” don't try to reset it and call an expert from Oak Grove Heating & Air Conditioning at 601-292-9763 immediately.
No matter your furnace’s age or brand, it has at minimum one regular wall switch placed on or near it.
- Ensure the lever is moved up in the “on” placement. If it was turned off, anticipate your furnace could take up to five minutes to ignite. (If you’re unsure where to locate your furnace, check your basement, garage or utility closet. It can also be in a crawl space or attic.)
3. Buy a New Air Filter
When we consider furnace problems, a grungy, blocked air filter is regularly the top offender.
If your filter is too dirty:
- Your furnace won’t be able to stay on, or it might overheat from reduced airflow.
- Your energy expenses might go up because your heat is working too often.
- Your heat might stop working sooner than it should because a filthy filter triggers it to work harder.
- Your heating might be disconnected from power if an excessively clogged filter causes the breaker to trip.
While it depends on what model of heater you own, your air filter is located inside the blower compartment of your heating system, an attached filter case or wall-mounted return air grille.
To replace your filter:
- Cut the power to your heater.
- Take out the filter and angle it toward the light. If you can’t view light through it, use a new one.
- Put in the new filter with the arrow pointing toward the heating system to keep damage from happening.
Flat filters ought to be replaced monthly, while pleated filters should last about three months. If you have children or pets, you might have to change your filter more frequently.
To make the procedure go more quickly in the future, draw with a permanent marker on your heater exterior or ductwork to indicate the airflow direction and filter size.
4. Check the Condensate Pan
Otherwise known as drain pans, condensate pans catch liquid your heating system pulls from the air.
If moisture is dripping out of your heater or its pan is overflowing, use these steps.
- If your pan contains a drain (look for a PVC pipe), double-check that it isn’t clogged. If it needs to be drained, drop in a special pan-cleaning tablet you can purchase at home improvement or hardware retailers.
- If your pan uses a pump, inspect the float switch. If the switch is jammed “up” with water in the pan, call us at 601-292-9763, because you will likely have to get a new pump.
5. Look for Heater Error Codes
If failures persist, peek inside your furnace’s plastic window to check the blower motor’s status. Depending on the type, the light might also be attached on the exterior of your furnace.
If you note anything other than a steady, colored light or flickering green light, reach us at 601-292-9763 for HVAC service. Your heater might be communicating an error code that requires pro service.
6. Clean the Flame Sensor
If your heater makes an effort to run but turns off without putting out warm air, a dusty flame sensor can be at fault. When this occurs, your heater will make an attempt to start three times before a safety device turns it off for about an hour.
If you feel okay with removing the panels from your furnace, brushing off your flame sensor is work you are able to do on your own. Or, one of our heating service experts has the ability to do it for you.
If you want to clean the sensor yourself, you require:
- A 1/4” hex screwdriver or wrench
- Portion of light grit sandpaper, steel wool or emery cloth
- An unused paper towel
As the next step:
- Disable the furnace’s power by using its wall switch or breaker. If you don’t have an electric gas valve, you have to switch off the gas along with it.
- Take off the furnace’s front panel and track the wire to the flame sensor.
- Take off 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.
- Put the sensor back in.
- Replace the furnace doors.
- Restore power to the furnace. It might run through a sequence of checks before resuming normal running. If your heater doesn’t start, the sensor may require replacement or something else could be wrong. If this takes place, get in touch with us at 601-292-9763 for heating and cooling repair support.
7. Reignite the Pilot Light
If you are using an older heater, the pilot light could be out. To light it, locate the steps on a sticker on your heating system, or try these steps.
- Find the lever beneath your heating system labeled “pilot,” “on” and “off.”
- Move the switch to the “off” position.
- Don’t do anything for at least five minutes to prevent creating a fire.
- Turn the switch to “pilot.”
- Press the “reset” lever as you bring the flame of a long lighter to the pilot light opening.
- Depress the “reset” button once the pilot light is ignited.
If you have followed the instructions twice and the pilot light still won’t burn or remain ignited, contact us at 601-292-9763 for furnace service.
Double-Check Your Fuel Source
Try turning on a second gas appliance. If it doesn’t operate, your natural gas service could be turned off, or you might have run out of propane.