How To Figure Out What Issues Your Furnace Has?


If a furnace isn't operating properly, there are a number of potential signs that there's trouble. Let's look at four of the most common ways you may be able to identify a problem that requires the attention of a furnace repair services technician.

Blinking Lights

As is the case with most modern machines, a furnace built in the last few decades will have an error-code system. On the vast majority of furnaces sold today, the error state of the system is signaled by a blinking light on the side of the unit. You may have to remove the front panel to gain access to the light.

Unfortunately, these signals are not standardized across manufacturers. Generally, though, a properly working furnace will have a green like that just blinks one time, pauses, and then blinks again. If you see a yellow light, this usually indicates that the furnace is talking with the thermostat and that everything is fine. The yellow light typically appears during heating and cooling cycles before and after a furnace runs.

Any sort of blinking red light is probably bad news. You can find a list of the codes for several manufacturers here.

Blowing Cold Air

Cold air coming out of the vents isn't necessarily a sign of trouble. It becomes worrisome, though, if the cycle is completed without ever blowing warm air.


Even the slightest hint of a smell of natural gas is a sign that furnace repair work has to be done. Shut everything off and contact a technician immediately.

Other smells may or may not be problematic. Generally, greasy or smoky smells from a furnace aren't good and should be checked. Musty or dusty smells, on the other hand, may be common around the time you just start the system up regularly for the first time in the fall. If the smell doesn't abate after 48 hours of regular use, you may want to talk with a technician.


The most common noises are mechanical ones that arise from issues involving the blower motor or the squirrel cage attached to the motor. Squealing or repeated clunking sounds often indicate trouble with these components, and there's a good chance they will need to be replaced.

Any thumps or booms are deeply concerning. Typically, these sounds occur when the furnace's ignition process is delayed. Gas builds up, and the noise is the release of energy when the gas ignites. Shut the system down, and call a pro immediately.

For more information, contact a furnace repair service.


14 February 2020

Keeping up With Maintenance Between HVAC Inspections

Working with HVAC contractors is an important part of being a homeowner. Not only do your contractors ensure that a new system you buy is properly installed, but they also ensure optimal performance throughout the years through a series of regular inspections, maintenance services, and repairs. But there are lots of things you can do in between your contractor's visits to ensure that your HVAC investment is always in tip top condition, aside from cleaning out the air filters. After working with my dad for more than a decade in the HVAC business, I've put together a few methods homeowners can use to maintain a well working system, and I have published those tips and tricks right here on this blog. I hope some of the information you find here helps you on your journey as a homeowner!