6 Vital Things You Should Do When Your Furnace Won’t Turn On


A furnace that won’t switch on can be a source of tremendous stress. If you’ve found yourself in this situation, don’t panic! We’ve got you covered with a list of simple things you can try to get it working again.

Check your thermostat

The thermostat is a crucial aspect of your furnace’s proper functioning. You might have set your thermostat to cool temperatures. It may have reset completely, run out of batteries, lost its programming, or malfunctioned. If your thermostat works, set a warm temperature that causes your furnace to turn on.

Check the circuit breakers

Even furnaces powered by gas have components that require electricity to function. Your furnace’s circuit breaker may have tripped. You need to reset the circuit breaker to get it back to normal. You’ll have to look into the control panel and flip it to the off position before turning it back on.

Check the furnace’s air filters

Clogged air filters obstruct airflow, which may cause your furnace to overheat to keep up with your house’s warmth requirements. This overheating can trigger your furnace’s high-limit switch for safety.

You must replace your furnace’s filters every 1-3 months to keep things running smoothly.

Check the furnace’s drain pan

Your furnace most likely has a drain pain underneath to collect excess water. A well-functioning furnace will automatically pump out the water. If you find a drain pan full of water, it might’ve triggered your furnace’s safety float switch, which causes your system to shut down completely. For a temporary solution, you can drain the pan, but eventually, you’ll require an HVAC professional to inspect your unit for clogged lines or drains.

Check the furnace’s pilot light

A well-functioning furnace’s pilot light should be a bright blue. A yellow pilot light can indicate carbon monoxide problems. Many furnaces will automatically shut down to prevent gas or carbon monoxide leaks.

Check your furnace’s fuel supply

If your oil, gas, or propane furnace isn’t getting sufficiently fueled, it will not be able to function. Ensure the gas valve is set to the right “ON” position. If the valve is on and your furnace isn’t working, turn on another gas appliance in your home to rule out problems with the gas supply.

Is your furnace still not working? Call Premier Comfort!

We’re an HVAC you can trust. We have 12 years of experience serving Brighton, Colorado, and its surrounding areas. Our team is full of friendly, honest, NATE-certified professionals that prioritize your comfort every step of the way.

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