Furnace Repair in Tucson, AZ

HVAC man working on a furnace

When your HVAC system won’t work, doing your own furnace repair in Tucson, AZ, can seem like a big undertaking.

There are several quick, inexpensive things you can take on by yourself to avoid a heating repair call.

If your heater doesn’t turn on, won’t run consistently or won’t fire, try the troubleshooting checklist below before contacting an HVAC professional.

If you realize you need help from a heating and cooling expert and live in Tucson, A&M Heating & Cooling LLC will be able to provide assistance to you. We have the ability to repair most types of heating systems.

CALL NOW 520-200-1048

If it’s time for a new heater, we also offer furnace installation.

While you’re in touch with us, consider an annual furnace maintenance plan from A&M Heating & Cooling LLC that may help you avoid breakdowns down the road. We can tell you how regularly your heater should be checked by one of our professionals.

Use our simple checklist as shown to get to work on troubleshooting your heating system. Most of these steps don’t have a need for mechanical skills to complete your furnace repair.

Furnace Repair Checklist

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1. Inspect the Thermostat

First, ensure your thermostat is signaling your heat to ignite.

Digital Thermostat

  • Replace the batteries if the screen is blank. If the digital monitor is messed up, the thermostat could need to be changed.
  • Ensure the button is on “heat” as opposed to “off” or “cool.”
  • Make certain the program is set to the correct day and time and is programmed to “run.” If you’re having problems getting out of the program, adjust the temperature by utilizing the up/down arrows and using 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 what the room temperature currently is.

If your furnace hasn’t started within a few minutes, make sure it has electricity by switching the fan switch from “auto” to “on.” If the fan doesn’t begin to run, your heating system could be without power.

Smart Thermostat

If you have a smart thermostat—for example one made by Nest, Ecobee, Lux, Honeywell or Bosch—troubleshooting is very model-specific. Take a look at the manufacturer’s website for assistance. If you aren’t able to get your Wi-Fi thermostat to work, call us at 520-200-1048 for heating and cooling service.

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2. Check Breakers and Switches

Next, confirm your breaker and furnace switch are on.

  • Locate 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 aren’t moist prior to touching the panel or breakers.
  • Look for the breaker titled “furnace” or “heat,” and double-check it’s turned “on.” If the breaker has tripped, it will be in the middle or “off” spot.
  • With one hand, firmly turn the breaker to the “on” position. If the breaker immediately trips and pops back to “off,” don't try to reset it and get in touch with an expert from A&M Heating & Cooling LLC at 520-200-1048 right away.

Regardless of 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 flipped up in the “on” position. If it was switched off, it could take your furnace up to five minutes to turn on. (If you’re unsure where your furnace is located, look in your basement, garage or utility closet. It can also be in a crawl space or attic.)
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3. Buy a New Air Filter

When we think about heater breakdowns, a dirty, blocked air filter is regularly the top offender.

If your filter is too dusty:

  • Your furnace won’t stay on, or it may get too hot from restricted airflow.
  • Your gas costs might go up because your heating system is switching on too often.
  • Your heat could fail prematurely due to the fact a dirty filter causes it to overwork.
  • Your heater may be cut off from power if an excessively filthy filter causes the breaker to trip.

Based on what type of heater you use, your air filter can be found in the interior of 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 furnace.
  • Remove the filter and angle it toward the light. If you can’t view light through it, replace it.
  • Put in 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. If you have children or pets, you may have to put in a new filter more frequently.

To make the procedure go more quickly down the road, use a permanent pen on your furnace exterior or ductwork to show the airflow direction and filter size.

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4. Inspect the Condensate Pan

Also known as drain pans, condensate pans capture liquid your furnace draws from the air.

If liquid is seeping from your heating system or its pan has too much water in it, try these guidelines.

  • If your pan includes a drain (look for a PVC pipe), check that it isn’t full. If it should be drained, drop in a special pan-cleaning tablet you can get at home improvement or hardware stores.
  • If your pan uses a pump, inspect the float switch. If the switch is jammed “up” with liquid in the pan, reach us at 520-200-1048, because you will possibly have to buy a new pump.
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5. Check for Furnace Error Codes

If faults continue, take a look inside your heating system’s plastic window to check the blower motor’s status. Depending on the brand, the light may also be attached on the exterior of your heater.

If you note anything except a solid, colored light or flickering green light, call us at 520-200-1048 for HVAC service. Your heater may be emitting an error code that needs professional help.

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6. Scrub the Flame Sensor

If your heater attempts to start but switches off without putting out heated air, a grimy flame sensor might be responsible. When this takes place, your furnace will attempt to start three times before a safety feature turns it off for about an hour.

If you feel okay with taking the panels off your heater, brushing off your flame sensor is a task you have the ability to do on your own. Or, one of our heating service specialists can do it for you.

If you want to clean the sensor personally, you need:

  • A 1/4” hex screwdriver or wrench
  • Bit of light grit sandpaper, steel wool or emery cloth
  • A dry, clean paper towel


  • Turn off the heater’s power by using its wall switch or breaker. If your gas valve isn’t electric, you will need to switch off the gas along with it.
  • Remove the furnace’s front panel and track the wire to the flame sensor.
  • Unscrew the rod and use your sandpaper, steel wool or emery cloth to lightly scrub the metal rod.
  • Clean the rod with a paper towel.
  • Remount the sensor.
  • Replace the furnace doors.
  • Turn the furnace’s power back on. It might run through a set of examinations before continuing normal operation. If your heater doesn’t ignite, the sensor may require replacement or something else could be creating an issue. If this occurs, get in touch with us at 520-200-1048 for heating and cooling repair help.
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7. Light the Pilot Light

If you are using an older heating system, the pilot light could be out. To relight it, look for the guide on a label on your heating system, or try these steps.

  • Locate the switch on the bottom of your furnace marked “pilot,” “on” and “off.”
  • Move 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” lever as you move the flame of a long lighter to the pilot light opening.
  • Let go of the “reset” lever once the pilot light is burning.
  • If you have followed the instructions twice and the pilot light still won’t burn or remain lit, get in touch with us at 520-200-1048 for furnace service.

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Inspect Your Fuel Delivery System

Try using a second gas appliance. If it doesn’t operate, your natural gas delivery might be switched off, or you might have run out of propane.

We Can Help with Furnace Servicing

Followed our troubleshooting list but your furnace still doesn’t operate?

Call us now at 520-200-1048 or contact us online. We’ll make a call at your house and figure out the problem.


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