How Come My Heater Won’t Turn On?

How Come My Heater Won’t Turn On?

Updated: Feb 2021

As temperatures steadily begin to drop, people are starting to turn up the heat in their homes. But, what happens when you adjust the thermostat and nothing happens? If your central heating is not working as expected, there could be several reasons why.

3 Reasons Why Your Heater Won’t Turn On

When troubleshooting why your heater won’t turn on, check these three things first.

1. Thermostat

Howard Air - Heater Won't Turn On Check Thermostat

When the heater won’t turn on, the first thing to check is your thermostat. Verify the power is turned on and check your circuit board to make sure the unit is getting power. Next, double-check to make sure the furnace door has been shut completely. There may be a switch inside the door that shuts off power to the unit if the door is not properly shut.

If you have a battery-operated thermostat, you may simply need to change the batteries. Or, if your unit has fuses, check to make sure the fuses are not burnt out.

If the thermostat is powered on but the heater itself does not seem to be working, confirm that its settings are correct.

2. Filter Replacement

Howard Air - Heater Won't Turn On Check Filter

We recommend replacing your filters regularly. A dirty filter can keep the unit from heating properly. If the filter is visibly dirty, replace it and see if a new filter makes a difference.
Double Check Air Flow

Are all of your registers open, and is air flowing consistently? If your registers are closed, it can affect the ability of the system to deliver heated air. If there is no airflow, check the blower motors in the furnace. Periodically, the motor’s belts may need to be replaced. If you see cracks or fraying in the belt, it’s time for a new one.

3. Igniter or Pilot Light

Howard Air - Heater Won't Turn On Check Pilot Light

If you have a gas heater, make sure the pilot light is lit. If the thermostat has power and is operational, but the heat still doesn’t come on, shut off the gas reset valve located inside the unit. Then, wait five minutes and turn the unit back on.

It is also important to check that the unit has gas. If it does and the igniter still isn’t lighting, it’s time to call in one of our professionals.

Contact Howard Air for All Phoenix Area Heater Issues

Remember, fixing common heater issues can sometimes prevent larger problems from occurring. Most units require the services of a certified technician, so please request a service call from the friendly professionals at Howard Air by calling (623) 201-5153.

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