Furnace Repair Checklist
1. Check the Thermostat
First, ensure your thermostat is telling your heat to turn on.
- Replace the batteries if the display is not displaying anything. If the digital display is mixed up, the thermostat could need to be changed.
- Make certain that the control is switched to “heat” as opposed to “off” or “cool.”
- Make certain the program is displaying the right day and time and is scheduled to “run.” If you’re having problems turning off the schedule, adjust the temperature by utilizing the up/down arrows and pressing the “hold” button. This will cause the furnace to turn on if thermostat is causing trouble.
- Set the temperature setting to 5 degrees hotter than the temperature of the room.
If your heating hasn’t started within a few minutes, make certain that it has juice by toggling the fan switch from “auto” to “on.” If the fan doesn’t operate, your furnace might not have power.
If you use a smart thermostat—such as one made 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 assistance. If you’re still unable to get your Wi-Fi thermostat to operate, contact us at 907-202-9798 for heating and cooling service.
2. Examine Breakers and Switches
Next, confirm your breaker and furnace switch are on.
- Locate your main electrical panel. If you don’t know where it is, keep an eye out for a silver metal box in your basement, garage or closet.
- Make sure your hands and feet aren’t moist prior to opening the panel or breakers.
- Look for the breaker titled “furnace” or “heat,” and double-check it’s reading “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 call a professional from Discount Mechanical Heating & Plumbing Services at 907-202-9798 quickly.
No matter your furnace’s age or brand, it has at least one regular wall switch placed on or close to it.
- Make sure the control is moved up in the “on” placement. If it was switched off, anticipate your furnace could take up to five minutes to start. (If you’re unaware of where to find your furnace, look in your basement, garage or utility closet. It can also be in a crawl space or attic.)
3. Get a New Air Filter
When we think about heating problems, a filthy, blocked air filter is often the top offender.
If your filter is too dusty:
- Your furnace won’t stay on, or it could get too hot from reduced airflow.
- Your energy costs might be higher because your furnace is operating more than it should.
- Your furnace may fail sooner than it should because a dirty filter triggers it to overwork.
- Your heater may be cut off from power if an excessively filthy filter causes the breaker to trip.
Based on what model of heating system you use, your air filter can be found within the blower compartment of your furnace, an attached filter case or wall-mounted return air grille.
To swap out your filter:
- Cut the power to your heating system.
- Pull out the filter and hold it up to the light. If you can’t view light through it, use a new one.
- Install the new filter with the arrow facing toward the furnace to prevent damage.
Flat filters should be replaced once a month, while pleated filters should last about three months. If you have children or pets, you may have to replace your filter more often.
To make the process easier down the road, use a permanent marker on your heater exterior or ductwork to show the airflow direction and filter size.
4. Look at the Condensate Pan
Otherwise known as drain pans, condensate pans capture liquid your heating system removes from the air.
If moisture is seeping out of your furnace or its pan has standing water in it, use these recommendations.
- If your pan includes a drain (look for a PVC pipe), double-check that it isn’t full. If it requires draining, drop in a special pan-cleaning tablet you can buy at home improvement or hardware stores.
- If your pan contains a pump, inspect the float switch. If the switch can’t be moved from the “up” position with standing water in the pan, reach us at 907-202-9798, because you will possibly have to get a new pump.
5. Check for Furnace Error Codes
If malfunctions persist, look at your heating system’s plastic window to confirm the blower motor’s status. Dependent on the type, the light may also be fixed on the outside of your heater.
If you note anything other than a steady, colored light or blinking green light, contact us at 907-202-9798 for HVAC service. Your heating system might be giving an error code that is calling for pro service.
6. Clean the Flame Sensor
If your furnace attempts to operate but switches off without blowing warmth, a grimy flame sensor could be at fault. When this takes place, your heating system will make an attempt to ignite three times before a safety device turns it off for about an hour.
If you feel comfortable with opening up your heater, brushing off your flame sensor is work you have the ability to do personally. Or, one of our heating service professionals can complete it for you.
If you want to clean the sensor yourself, you require:
- A 1/4” hex screwdriver or wrench
- Section of light grit sandpaper, steel wool or emery cloth
- An unused paper towel
- Disable the furnace’s power through its wall switch or breaker. If your furnace’s gas valve isn’t electric, you have to shut off the gas as well.
- Remove the heater’s front panel and follow the wire to the flame sensor.
- Unscrew the rod and use your sandpaper, steel wool or emery cloth to lightly scrub the metal rod.
- Wipe off the rod with a paper towel.
- Remount the sensor.
- Replace the furnace doors.
- Restore power to the furnace. It might run through a series of checks before continuing regular running. If your heating system doesn’t ignite, the sensor may require replacement or something else may be creating an issue. If this takes place, call us at 907-202-9798 for heating and cooling repair help.
7. Light the Pilot Light
If you have an outdated heater, the pilot light could be out. To relight it, look for the instructions on a sheet on your heater, or follow these guidelines.
- Locate the lever on the bottom of your furnace that says “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.
- Move the switch to “pilot.”
- Hold down the “reset” lever as you move 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 keep burning, call us at 907-202-9798 for furnace service.
Inspect Your Fuel Source
Try using another gas appliance. If it doesn’t operate, your natural gas source might be shut off, or you may have run out of propane.