Furnace Repair Checklist
1. Inspect the Thermostat
To start, make certain that your thermostat is instructing your furnace to turn on.
- Change the batteries if the display is empty. If the digital monitor is jumbled, the thermostat might need to be swapped out.
- Ensure the control is on “heat” rather than “off” or “cool.”
- Make certain the program is showing the appropriate day and time and is set to “run.” If you’re having a hard time overriding the schedule, set the temperature by utilizing the up/down arrows and using the “hold” button. This will force the heat to start if thermostat programming is causing an issue.
- Set the temperature setting to 5 degrees hotter than the temperature of the room.
If your heating hasn’t started within several minutes, ensure it has power by changing the fan switch from “auto” to “on.” If the fan doesn’t operate, your furnace might not have power.
If you have a smart thermostat—such as 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, calll us at 732-806-5536 for heating and cooling service.
2. Examine Breakers and Switches
Next, you should confirm your breaker and furnace switch are on.
- Look for your house’s main electrical panel. If you have no idea where it is, keep an eye out for a metallic metal box in your basement, garage or closet.
- Make certain that your hands and feet aren’t wet in advance of opening the panel or breakers.
- Find the breaker titled “furnace” or “heat,” and make sure it’s switched “on.” If you discover a tripped breaker, it will be in the middle or “off” spot.
- Using one hand, steadily flip the breaker to the “on” location. If the breaker instantly trips and pops back to “off,” don’t touch it and call a professional from Aggressive Mechanical at 732-806-5536 immediately.
No matter your furnace’s age or brand, it has no less than one regular wall switch set on or near it.
- Make sure the control is moved up in the “on” placement. If it was switched off, it could take your furnace up to five minutes to ignite. (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. Buy a New Air Filter
When we think about heater issues, a filthy, blocked air filter is frequently the top culprit.
If your filter is too dusty:
- Your heating system won’t be able to stay on, or it may get too warm from reduced airflow.
- Your energy costs might increase because your heat is operating more than it should.
- Your heater might fail prematurely due to the fact a dusty filter forces it to work overtime.
- Your heating system may lose power if an overly filthy filter causes the breaker to trip.
Based on what make of furnace you own, your air filter will be within the blower compartment of your furnace, an attached filter case or wall-mounted return air grille.
To replace your filter:
- Cut the power to your heating system.
- Take out the filter and tilt it toward the light. If you can’t see light through it, replace it.
- Install the new filter with the arrow motioning toward the heater to prevent damage.
Flat filters should be replaced monthly, while pleated filters should last about three months. You can also buy a washable filter that will work for about 10 years. If you have children or pets, you could have to put in a new filter sooner.
To make changing your filter smoother in the future, write with a permanent pen on your heating system housing or ductwork to show the airflow direction and filter size.
4. Check the Condensate Pan
Commonly known as drain pans, condensate pans catch moisture your heating system pulls from the air.
If moisture is dripping from your heating system or its pan is overflowing, try these recommendations.
- If your pan contains a drain (look for a PVC pipe), check that it isn’t clogged. If it requires draining, drop in a special pan-cleaning tablet you can buy at home improvement or hardware shops.
- If your pan uses a pump, inspect the float switch. If the button is jammed “up” with water in the pan, call us at 732-806-5536, because you will possibly need a new pump.
5. Check for Furnace Error Codes
If faults persist, take a look at your heater’s plastic window to verify the blower motor’s status. Depending on the type, the light could also be fixed on the exterior of your heating system.
If you see anything other than an uninterrupted, colored light or flickering green light, contact us at 732-806-5536 for HVAC service. Your furnace may be communicating an error code that is calling for professional assistance.
6. Clean the Flame Sensor
If your heater tries to start but shuts off without blowing heat, a grimy flame sensor might be at fault. When this happens, your heating system will try to ignite three times before a safety mechanism turns it off for around an hour.
If you feel confident with opening up your heating system, cleaning your flame sensor is work you can do yourself. Or, one of our heating service specialists is able to finish it for you.
If you are confident cleaning the sensor personally, you should have:
- A 1/4” hex screwdriver or wrench
- Piece of light grit sandpaper, steel wool or emery cloth
- A dry, clean paper towel
As the next step:
- Disable the heating system’s power by using its wall switch or breaker. If your furnace’s gas valve isn’t electric, you must switch off the gas along with it.
- 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 rub the metal rod.
- Wipe off the rod with a paper towel.
- Remount the sensor.
- Put the furnace doors back on.
- Restore power to the furnace. It might go through a set of inspections before continuing usual operation. If your heater doesn’t turn on, the sensor might require replacement or something else may be wrong. If this takes place, get in touch with us at 732-806-5536 for heating and cooling repair assistance.
7. Light the Pilot Light
If you have an outdated furnace, the pilot light could be turned off. To reignite it, look for the instructions on a label on your heater, or try these guidelines.
- Locate the switch beneath your heater that says “pilot,” “on” and “off.”
- Push the switch to the “off” position.
- Wait at least five minutes to limit the possibility for sparking a fire.
- Turn the dial to “pilot.”
- Push the “reset” lever as you bring the flame of a long lighter to the pilot light opening.
- Depress the “reset” lever once the pilot light is lit.
If you have gone through the guide twice and the pilot light still won’t burn or stay ignited, get in touch with us at 732-806-5536 for furnace service.
Inspect Your Fuel Supply
Try using an additional gas appliance. If it doesn’t function, your natural gas delivery could be turned off, or you might have run out of propane.