Furnace Repair Checklist
1. Examine the Thermostat
To start, ensure your thermostat is telling your heat to start.
- Swap out the batteries if the monitor is empty. If the digital display is messed up, the thermostat might need to be replaced.
- Make certain that the switch is on “heat” rather than “off” or “cool.”
- Ensure the program is set to the appropriate day and time and is scheduled to “run.” If you’re having a hard time overriding the setting, regulate the temperature with the up/down arrows and pressing the “hold” button. This will cause the furnace to start if thermostat is causing a problem.
- Increase the temperature setting to 5 degrees hotter than what the room temperature currently is.
If your heating hasn’t kicked on within several minutes, make certain that it has electricity by moving the fan switch from “auto” to “on.” If the fan doesn’t start, your heater might not have power.
If you use a smart thermostat—for example one manufactured by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting will be determined by the model you have. Refer to the manufacturer’s website for help. If you still can’t get your Wi-Fi thermostat to function, contact us at 478-202-3076 for heating and cooling service.
2. Inspect Breakers and Switches
Next, check if your breaker and furnace switch are on.
- Find your main electrical panel. If you have no idea where it is, keep an eye out for a silver metal box in your basement, garage or closet.
- Ensure your hands and feet are dry prior to touching the panel or breakers.
- Find the breaker labeled “furnace” or “heat,” and ensure it’s switched “on.” If you find that the breaker tripped, it will be in the middle or “off” area.
- Moving one hand, quickly flip the breaker to the “on” position. If the breaker instantly trips and pops back to “off,” don't try to reset it and get in touch with a professional from Gillman Heating and Air at 478-202-3076 right away.
Regardless of your furnace’s age or brand, it has no less than one regular wall switch situated on or close to it.
- Ensure the switch is moved up in the “on” position. If it was turned off, anticipate your furnace could take up to five minutes to ignite. (If you’re unsure where to find your furnace, look in your basement, garage or utility closet. It might also be in a crawl space or attic.)
3. Get a New Air Filter
When it comes to heater issues, a grungy, clogged air filter is regularly to blame.
If your filter is too grungy:
- Your heat won’t be able to stay on, or it may overheat from limited airflow.
- Your gas expenses might be higher because your furnace is working more than it should.
- Your heat might fail too soon since a filthy filter forces it to overwork.
- Your heating system can lose power if an excessively dirty filter is the cause of a tripped breaker.
Depending on what type 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 heating system.
- Take out the filter and hold it up to the light. If you can’t view light through it, get a new one.
- Install the new filter with the arrow pointing toward the furnace to avoid damage.
Flat filters ought to be replaced every month, while pleated filters should last about three months. If you have children or pets, you could have to change your filter more often.
To make changing your filter easier in the future, write with a permanent writing tool on your heater housing or ductwork to list the airflow direction and filter size.
4. Check the Condensate Pan
Commonly known as drain pans, condensate pans hold moisture your heating system removes from the air.
If water is dripping out of your heater or its pan is overflowing, use these recommendations.
- If your pan includes a drain (look for a PVC pipe), double-check that it isn’t clogged. If it should be drained, use a special pan-cleaning tablet you can purchase at home improvement or hardware retailers.
- If your pan uses a pump, check the float switch. If the lever is jammed “up” with water in the pan, reach us at 478-202-3076, because you will possibly have to install a new pump.
5. Check for Furnace Error Codes
If failures persist, look within your heater’s plastic window to confirm the blower motor’s status. Subject to the brand, the light could also be mounted on the exterior of your furnace.
If you see anything except an uninterrupted, colored light or twinkling green light, reach us at 478-202-3076 for HVAC service. Your heater may be communicating an error code that needs specialized assistance.
6. Brush off the Flame Sensor
If your furnace tries to operate but turns off without blowing warmth, a dusty flame sensor might be to blame. When this occurs, your furnace will make an attempt to turn on three times before a safety feature powers it down for approximately an hour.
If you feel comfortable with opening up your heater, brushing off your flame sensor is a job you are able to do on your own. Or, one of our heating service professionals can complete it for you.
If you are fine with cleaning the sensor personally, you require:
- A 1/4” hex screwdriver or wrench
- Section of light grit sandpaper, steel wool or emery cloth
- An unused paper towel
- Turn off the heater’s power through its wall switch or breaker. If your gas valve isn’t electric, you will need to turn off the gas in addition.
- Lift off 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 carefully rub the metal rod.
- Wipe off the rod with a paper towel.
- Screw the sensor back in.
- Replace the furnace doors.
- Turn the furnace’s power back on. It may run through a sequence of checks before continuing usual heating. If your furnace doesn’t ignite, the sensor may require replacement or something else might be wrong. If this happens, call us at 478-202-3076 for heating and cooling repair assistance.
7. Reignite the Pilot Light
If you are using an older heating system, the pilot light could be extinguished. To relight it, locate the directions on a sheet on your heater, or follow these recommendations.
- Find the switch below your heater marked “pilot,” “on” and “off.”
- Move the switch to the “off” position.
- Don’t do anything for at least five minutes to limit the possibility for sparking a fire.
- Move the dial to “pilot.”
- Push the “reset” lever as you move the flame of a long lighter to the pilot light opening.
- Depress the “reset” lever once the pilot light is burning.
If you have gone through the list twice and the pilot light still won’t burn or remain ignited, contact us at 478-202-3076 for furnace service.
Examine Your Fuel Source
Try switching on a second gas appliance. If it doesn’t function, your natural gas source may be shut off, or you might have run out of propane.