Why Is There a Blinking Red Light on My Furnace?

A blinking red light on your furnace can be alarming because it indicates damage or malfunction of a critical component. In this post, trusted local HVAC contractor A-1 Comfort Care Heating, Cooling & Plumbing shares the common reasons why this is happening.

Open Limit Switch

The limit switch on your furnace monitors the system’s temperature. If it gets too hot, it will open and shut off power, causing a blinking red light on your furnace. Excessive heat can happen because of clogged and dirty filters or blockage that requires experts to remove.

Gas Valve Malfunction

Critical gas valve issues can stop or increase fuel flow to your system beyond what is needed, causing the furnace to stop working. Call an HVAC expert to check if your gas valve system has an issue.

Low Voltage

Furnaces plugged into old electrical systems can’t start properly because of the circuit’s issues and insufficient energy production. On the other hand, the furnace’s power circuit could also have damaged components that require a trained eye to spot and repair. 

To solve this, check if your circuit breakers are in the correct position to supply power to the furnace. Call an HVAC and furnace contractor to help you if this doesn’t work.

Circuit Board Failure

Circuit board issues will keep the unit shut off. Boards that have endured a short circuit or have damaged components would need replacements. An HVAC expert can check the circuit board’s condition and see if your furnace will start operating.

Need help with your malfunctioning furnace? Safely troubleshoot your unit with the help of experts with training and experience. A-1 Comfort Care Heating, Cooling & Plumbing is a reliable heating and cooling expert trusted by households in the local area to handle any HVAC-related issue. No job is too small for our team of experts who have decades of experience and knowledge. Call us at (732) 578-0379 or fill out this contact form to get an estimate.