Furnace Repair Checklist
1. Look at the Thermostat
To begin, make certain that your thermostat is instructing your heat to ignite.
- Change the batteries if the monitor is empty. If the digital monitor is messed up, the thermostat could need to be swapped out.
- Ensure the button is set to “heat” as opposed to “off” or “cool.”
- Make sure the program is showing the appropriate day and time and is set to “run.” If you’re having a hard time turning off the setting, set the temperature by using the up/down arrows and using the “hold” button. This will cause the furnace to ignite if thermostat is causing an issue.
- Increase the temperature setting to 5 degrees warmer than what the room temperature currently is.
If your heat hasn’t kicked on within a few minutes, make sure it has power by changing the fan switch from “auto” to “on.” If the fan doesn’t begin to run, your furnace might not have power.
If you use a smart thermostat—like one manufactured by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting is very model-specific. Refer to the manufacturer’s website for assistance. If you’re still unable to get your Wi-Fi thermostat to function, call us at 979-323-6130 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 have no idea where it is, search 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 marked “furnace” or “heat,” and make sure it’s moved to “on.” If the breaker has tripped, it will be in the middle or “off” area.
- Using one hand, quickly flip the breaker to the “on” position. If the breaker immediately trips and pops back to “off,” don't try to reset it and contact a team member from Faust Air Conditioning and Heating at 979-323-6130 immediately.
Regardless of your furnace’s age or brand, it has no less than one ordinary wall switch located on or near it.
- Ensure the lever is moved up in the “on” placement. If it was shut off, anticipate your furnace could take up to five minutes to start. (If you’re unaware of where to locate your furnace, look in your basement, garage or utility closet. It could also be in a crawl space or attic.)
3. Put in a New Air Filter
When it comes to heater issues, a dirty, clogged air filter is frequently the top offender.
If your filter is too dirty:
- Your heater won’t keep heating your home, or it could overheat from limited airflow.
- Your gas expenses may go up because your heater is operating more often.
- Your heater may break down too soon since a dirty filter forces it to overwork.
- Your heater might lose power if an extremely dirty filter results in a tripped breaker.
While it depends on what model of heating system you own, your air filter can be found inside the blower compartment of your heating system, an attached filter case or wall-mounted return air grille.
To put in a new filter:
- Turn off your heating system.
- Take out the filter and tilt it toward the light. If you can’t notice light through it, replace it.
- Put in the new filter with the arrow facing toward the heater to prevent damage.
Flat filters need to be replaced once a month, while pleated filters should last about three months. If you have children or pets, you could have to change your filter sooner.
To make changing your filter easier in the future, draw with a permanent writing tool on your heater housing or ductwork to show the airflow direction and filter size.
4. Look at the Condensate Pan
Otherwise known as drain pans, condensate pans catch liquid your heating system pulls from the air.
If water is leaking from within your furnace or its pan has standing water in it, follow these recommendations.
- If your pan includes a drain (look for a PVC pipe), check that it’s clear. If it should be drained, use a special pan-cleaning tablet you can get at home improvement or hardware retailers.
- If your pan contains a pump, check the float switch. If the lever is stuck “up” with standing water in the pan, call us at 979-323-6130, because you will likely have to buy a new pump.
5. Check for Heating Error Codes
If faults persist, peek within your furnace’s plastic window to confirm the blower motor’s status. Dependent on the type, the light might also be mounted on the outside of your furnace.
If you note anything other than an uninterrupted, colored light or twinkling green light, contact us at 979-323-6130 for HVAC service. Your heating system might be communicating an error code that requires professional service.
6. Clean the Flame Sensor
If your furnace attempts to start but switches off without blowing warm air, a dusty flame sensor could be to blame. When this happens, your heater will try to turn on three times before a safety device powers it down for around an hour.
If you feel okay with removing the panels from your furnace, gently scrubbing your flame sensor is something you are able to do on your own. Or, one of our heating service specialists can do it for you.
If you are fine with cleaning the sensor on your own, you need:
- A 1/4” hex screwdriver or wrench
- Section of light grit sandpaper, steel wool or emery cloth
- A fresh paper towel
- Disable the heater’s power through its wall switch or breaker. If your furnace’s gas valve isn’t electric, you have to switch off the gas along with it.
- Remove the furnace’s front panel and follow the wire to the flame sensor.
- Remove the rod and use your sandpaper, steel wool or emery cloth to carefully scrub the metal rod.
- Clear the rod with a paper towel.
- Remount the sensor.
- Put the furnace doors back on.
- Turn the furnace’s power back on. It might proceed through a sequence of examinations before continuing normal heating. If your heating system doesn’t turn on, the sensor may have to be replaced or something else might be causing a problem. If this takes place, contact us at 979-323-6130 for heating and cooling repair support.
7. Reignite the Pilot Light
If you own an older furnace, the pilot light could be out. To light it, look for the guide on a sheet on your heating system, or try these guidelines.
- Look for the switch below your heating system labeled “pilot,” “on” and “off.”
- Push the switch to the “off” position.
- Don’t do anything for at least five minutes to limit the possibility for creating a fire.
- Push the dial to “pilot.”
- Press the “reset” lever as you push the flame of a long lighter to the pilot light opening.
- Let go of the “reset” button once the pilot light is ignited.
If you have used the instructions twice and the pilot light still won’t burn or remain burning, get in touch with us at 979-323-6130 for furnace service.
Double-Check Your Gas Source
Try using another gas appliance. If it doesn’t work, your natural gas delivery could be turned off, or you could be out of propane.