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Signs You Will Notice When Your Furnace Is Not Working Properly

January 4, 2021

Call it intuition – or just being observant – but most Los Angeles homeowners know when there is a problem with their central heat. It’s like the furnace is trying to tell them that there is a problem. But besides that pit-of-your-stomach feeling, there are some sure signs that your furnace is just not working right. 

Your System Isn’t Heating 

Let’s tell it like it is, shall we? If your heater isn’t heating, that’s a sign that something is wrong. So if you wake up feeling chilly and you’re sure your thermostat has power, all signs point to a repair. 

Similarly, if your furnace is cycling on and off frequently, it could be cause for concern. Many times this is a simple fix, but it definitely shouldn’t be ignored. Short cycling could be an indicator that your system is near the end of its life. If that’s the case, now is a good time to research a new heating system. It’s better to do that research while you still have some heat, than when you’re stuck in the cold and trying to make a quick decision. 

Unusual Noises or Odors

It’s important to use all your senses when troubleshooting heaters. Besides how you feel (too hot, too cold, or juuuust right) you should also consider the sounds and smells. A furnace that is rattling or making other noises is a definite indicator that there is a problem. Another sure sign? If your carbon monoxide monitor is beeping away. Take any CO alert seriously: carbon monoxide is both colorless and odorless, so it’s not always apparent there’s a problem.

Colors of the Flame

Another warning signal is the color and shape of the flame. If your heater is in good condition, the flame visible through the opening in your furnace should always be a pretty hue of blue. That’s indicative of a system that’s stable and burning clean. 

An abnormal flame inside your furnace is one that appears to be yellow or orange. When a burner gets dirt built up in or around it, yellow to orange flickering flames will be present. But a dirty burner is not always the reason for an unstable or yellow flame; these can also be signs of a gas leak or other problem. 

Don’t Wait to Call For Repair

Any of these problems – or a combination – could mean a major dollar sign in the future. And remember, broken furnaces don’t heal themselves. In fact, holding off on repair can make things worse and more costly in the long run. Call Brody Pennell for heater repair and we’ll resolve your problem quickly. 


Many issues can be avoided by scheduling an annual furnace maintenance and keeping up with it year over year. The best way to stay on top of these things is with an HVAC maintenance agreement like our BPM club! It’s a simple and easy way to make sure your furnace stays in tip-top condition for the long run. Whether you need repair today or if you’d like to schedule a tuneup, we’re here for you. Contact us today!


About The Author

Brody Pennell

Since 1945, Brody Pennell Heating & Air Conditioning is the committed to helping homeowners in the greater Los Angeles area experience total home comfort. In 2021, the readers of the Los Angeles Times voted Brody Pennell the Best HVAC Company in the area.

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