HVAC DIY Tips & Tricks

Why Won't My Furnace Turn On?

stay comfortable with phyxter home services

- By Russell Jones

Don't let the cold weather catch you off guard! If your furnace won't turn on, don't panic. We uncover the common reasons why your furnace may not be working and provide easy-to-follow troubleshooting tips to get it back up and running in no time

What to Check When Your Furnace Doesn’t Start

If this article doesn’t help your gas furnace blow hot air again, you’ll want to call an HVAC company. Here are some solutions to why it won't start.

Reset Your Circuit Breaker

Although many furnaces are fueled by natural gas or propane, some components require electricity to work. Check your circuit breaker first.

Turn on Your Furnace Service Switch

The easiest power issue to fix, and one that happens quite regularly is when someone turns the furnace service switch off, thinking it is a light switch.

Troubleshoot Your Thermostat

It is worth checking whether the thermostat has lost its programming, isn’t set to “HEAT,” the wires are disconnected, or the batteries may be dead.

Check Your Air Filter

Any heating or cooling system will be equipped with safety features that cause them to shut off when the air filter is dirty or clogged and needs changing.

Clean the Condensate Drain

All high-efficient furnaces take so much heat out of the flue gases that the exhaust condenses on the vent piping and then drains back to the furnace condensate trap.

Inspect the Flame Components

Most gas furnaces will not ignite unless the pilot light is burning or the hot surface ignitor works correctly. If it won’t stay lit, it’s likely because of the flame sensor.

Check the Fuel Supply

When having ignition problems, you should check whether the furnace has access to fuel. In some cases, the problem why a furnace won’t turn on may be because of no gas.

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