Furnace Repair Checklist
1. Examine the Thermostat
To begin, make sure your thermostat is telling your heat to ignite.
- Swap out the batteries if the monitor is empty. If the digital screen is scrambled, the thermostat might need to be replaced.
- Ensure the control is on “heat” as opposed to “off” or “cool.”
- Make sure the program is showing the appropriate day and time and is scheduled to “run.” If you’re having a hard time getting out of the setting, regulate the temperature by using the up/down arrows and pressing the “hold” button. This will cause the furnace to ignite if thermostat is causing trouble.
- Increase the temperature setting to 5 degrees above the room temperature.
If your furnace hasn’t turned on within a few minutes, make sure it has juice by moving the fan switch from “auto” to “on.” If the fan doesn’t begin to run, your furnace may 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. Check the manufacturer’s website for support. If you still can’t get your Wi-Fi thermostat to operate, reach us at 203-357-5913 for heating and cooling service.
2. Examine Breakers and Switches
Next, confirm your breaker and furnace switch are on.
- Find your main electrical panel. If you have no idea where it is, look for a gray metal box in your basement, garage or closet.
- Ensure your hands and feet aren’t wet in advance of opening the panel or breakers.
- Look for the breaker marked “furnace” or “heat,” and make sure it’s switched “on.” If you discover a tripped breaker, it will be in the middle or “off” position.
- Moving one hand, quickly 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 an expert from Central Air LLC at 203-357-5913 immediately.
It doesn’t matter how old your furnace is or what brand it is, it has no less than one standard wall switch positioned on or close to it.
- Ensure the lever is facing up in the “on” position. If it was turned off, it could take your furnace up to five minutes to turn on. (If you’re unaware of where to find your furnace, look in your basement, garage or utility closet. It could also be in a crawl space or attic.)
3. Replace the Air Filter
When it comes to furnace problems, a filthy, blocked air filter is often to blame.
If your filter is too dirty:
- Your heater won’t keep heating your home, or it may overheat from restricted airflow.
- Your gas costs could go up because your heating system is turning on too often.
- Your heat might stop working too soon since a dirty filter causes it to work harder.
- Your heater can be disconnected from power if an excessively clogged filter causes the breaker to trip.
Depending on what model of furnace you have, your air filter can be found in the interior of the blower compartment of your heater, an attached filter case or wall-mounted return air grille.
To put in a new filter:
- Switch off your heater.
- Pull out the filter and angle it toward the light. If you can’t notice light through it, get a new one.
- Install the new filter with the arrow facing toward the furnace to prevent 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 replace your filter more often.
To make the procedure smoother down the road, write with a permanent writing tool on your furnace exterior or ductwork to list the airflow direction and filter size.
4. Examine the Condensate Pan
Also known as drain pans, condensate pans hold water your heating system pulls from the air.
If moisture is dripping from within your heating system or its pan has standing water in it, follow these guidelines.
- If your pan has a drain (look for a PVC pipe), make sure that it isn’t clogged. If it should be drained, drop in a special pan-cleaning tablet you can purchase at home improvement or hardware stores.
- If your pan contains a pump, inspect the float switch. If the button is jammed “up” with liquid in the pan, contact us at 203-357-5913, because you will likely have to get a new pump.
5. Watch for Heating Error Codes
If failures continue, take a look inside your heating system’s plastic window to verify the blower motor’s status. Depending on the type, the light could also be mounted on the surface of your furnace.
If you note anything else besides a steady, colored light or flickering green light, contact us at 203-357-5913 for HVAC service. Your furnace might be communicating an error code that is calling for expert assistance.
6. Brush off the Flame Sensor
If your furnace makes an effort to operate but shuts off without distributing heat, a grimy flame sensor could be to blame. When this takes place, your heating system will try to ignite three times before a safety feature powers it down for about an hour.
If you feel confident with taking the panels off your heating system, brushing off your flame sensor is a job you are able to do on your own. Or, one of our heating service specialists can complete it for you.
If you are confident cleaning the sensor yourself, you require:
- A 1/4” hex screwdriver or wrench
- Section of light grit sandpaper, steel wool or emery cloth
- A fresh paper towel
As the next step:
- Shut off the furnace’s power through its wall switch or breaker. If you don’t have an electric gas valve, you have to turn off the gas as well.
- Remove the furnace’s front panel and track the wire to the flame sensor.
- Remove 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.
- Secure the furnace doors.
- Restore power to the furnace. It could go through a set of tests before proceeding with regular heating. If your furnace doesn’t turn on, the sensor might need to be replaced or something else may be wrong. If this occurs, get in touch with us at 203-357-5913 for heating and cooling repair support.
7. Light the Pilot Light
If you are using an older heating system, the pilot light could be turned off. To relight it, locate the steps on a sticker on your heating system, or follow these guidelines.
- Find the toggle below your heater marked “pilot,” “on” and “off.”
- Turn the switch to the “off” position.
- Don’t do anything for at least five minutes to avoid starting a fire.
- Turn the dial to “pilot.”
- Press the “reset” button as you bring the flame of a long lighter to the pilot light opening.
- Depress the “reset” switch once the pilot light is lit.
If you have gone through the guide twice and the pilot light still won’t burn or keep lit, call us at 203-357-5913 for furnace service.
Inspect Your Energy Delivery System
Try turning on a second gas appliance. If it doesn’t work, your natural gas source may be switched off, or you may have run out of propane.