What Does Blinking Light on a Furnace Mean?

You will find a little red light on your furnace. If the light glows solid, it means your furnace is working fine. But if it starts blinking, it means there is something wrong with it. Look closely, and you will notice an error code.

Before you reach out to an HVAC technician near you for help, write down the code you see. If the red light is not on, your furnace is not receiving power. Check the circuit breaker box to see if the breaker has tripped.

Here are some reasons why the light on a furnace blinks:

Blower Running After Power Up

Usually, when power gets restored to your furnace, your blower will fire up, and you will see an error code. It happens at times, and you do not need to worry about it. Your furnace should start soon.

Pressure Switch and Inducer Failures

Every furnace has a pressure switch and inducer. The draft inducer motor removes gases produced during the combustion process from the heat exchanger. The pressure switch monitors the draft inducer motor to check if it is removing the gases properly.

If you have reasons to believe that your pressure switch or inducer is going bad, check your chimney and make sure it is not blocked. If the problem occurs for no apparent reason, reach out to a technician.

Furnace Lockout

A furnace lockout occurs when your furnace tries to fire multiple times but fails to ignite. To resolve the problem, reset your furnace by cutting the power supply at the breaker. Leave your furnace off for a few seconds, and then turn it back on.

Gas, Proving Fault or Ignition Failure

If you are getting a code that indicates flame failure, problems with the gas, or ignition failure, check your flame sensor to see if it is dirty. A dirty flame sensor may not detect the flame even when there is one. Clean your sensor gently with light grit sandpaper.

If your flame sensor is clean, there could be a problem with the gas valve or ignitors. Taking the DIY route could prove to be a costly mistake. To prevent future problems and steer clear of safety risks, have your contractor inspect your system.

High Limit Switch & Roll Out Switch

Both the high limit switch and roll-out switch detect heat. The high limit switch monitors the temperature inside the heat exchanger. The roll-out switch detects signs of excessive heat and shuts the furnace down to prevent a fire from starting if it overheats.

Need furnace repair service in Bryant? Look no further than Countryside heating and Cooling Solutions. Whether you have a regular furnace problem or grappling with a significant issue, we will come up with a sustainable solution. To talk to one of our pros, call (763) 299-9996.