Why Is Your Furnace Blowing Cold Air?

If your furnace is blowing cold air when it is turned on and the thermostat is set, there are a few possible reasons why. In some cases, you can resolve the issue yourself, but in others you really should call a maintenance company.

Why Is Your Furnace Blowing Cold Air

However, in order to know what the cause of the problem is, you need to eliminate the most common problem makers. And if the problem is too complicated for you to resolve yourself, make sure that you contact the right company to do the job, like https://www.actionac.net/heating-repair-san-diego-ca.

Chip Glitch

The first thing you can do is the simplest. Check whether your furnace is on. Most newer furnaces have a computer onboard in order to ensure that everything is in working order. However, sometimes this computer is the cause of the problem. It can sometimes start the fans without releasing the fuel supply, causing the cold run.

Resolving that problem is really easy. All you need to do is restart your furnace. There should be a big red button somewhere in the furnace room. Just press it, wait a few seconds and press it again to power up the furnace again.

The Thermostat

The thermostat may seem like a straightforward piece of equipment, but sometimes even these things can cause confusion. For instance, your furnace probably has the fan settings. Keeping it on the ON mode may seem like a good idea, but what it actually means is that the fans keep working even when the furnace is off. This can cause cold air to blast from your vents. Keep your fan setting on AUTO.

And if you are worried that your furnace blows cold air after just being started, don’t worry, it takes time to build up heat, so wait a few minutes before jumping to conclusions that something is broken.

Your Fuel Supply

This one only works for people with furnaces that have tanks. When was the last time you checked your fuel levels? It could be the source of your cold stream. Gas furnaces need to have an ignitor for their flame.

If your furnace is a bit older, it probably has pilot lights. These can be blown out by a strong gust of wind, so all you need to do is reignite them and your furnace will be ready to warm you once again. Just make sure that you follow the instructions and set your gas supply to ‘pilot’. If, however, you have a newer model of furnace, with electric ignition, you will have to call in the experts.

The Filter

If your filter is dirty, it can cause your furnace to overheat, as heat builds up. In that situation, the furnace itself will automatically shut down, but the fans will continue to run in order to cool down the furnace. So your heating will be off and the fans will blow cold air.

Checking whether your filter is dirty is fairly easy. You can simply remove the service panel and it should be right there, next to the fan. Just make sure that the furnace is turned off first. Experts say that you should replace your furnace filter at least once every two months, so you know whether it is due for you.

Leaks in your ducts

Finally, if nothing else seems to be the cause of your problems, you can assume that you have a leak somewhere in your ducts. The heat produced by your furnace is dissipated through the leak before it reaches the place it is intended for.

Resealing the leak can be as easy as using the duct tape, but it is not a permanent solution. Replacing the leaking duct is the better option, and one which will involve calling in a professional.

If neither of these things is the cause of your cold run, there might be something wrong with the furnace itself, which will require a skilled technician to inspect and repair.

To contact Action Air Conditioning & Heating of San Diego
4455 Murphy Canyon Rd Suite 100–5, San Diego, CA 92123, USA
800-400-4152

 

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