Sometimes heater blow cold air , and this is for many reasons that lead to it .Here are some of the leading causes for this issue.
Dirty air filter:
An air filter is an essential piece of an HVAC system. When these are clean, these filters provide clean, fresh air for your home. However, when they’re dirty, your comfort could be in jeopardy. In fact, a dirty air filter can lead to a heater blowing cold air.
When this filter is too dirty, it blocks airflow over the furnace’s heat exchanger. This can cause the system to overheat, which trips a high limit switch—leading to a unit shutdown. This is a safety measure to prevent a fire or further complications.
If you’re unsure about the condition of your air filter, give it a visual inspection. If it appears overly dirty, go ahead and replace it. You can find affordable air filters at most home goods stores. If you need assistance, call a local HVAC professional for help.
The Pilot Light Went Out:
Most systems rely on fuel to heat the air for your home. To heat the fuel, your furnace has a pilot light. If the pilot light goes out, your heating will start blowing cold air.
It’s not uncommon for these lights to go out occasionally. You should be able to check the bottom of your furnace to see if the light has gone out.
If you don’t see a flame, start by turning off the thermostat. Next, you’ll relight the pilot. Most modern furnaces will have a special button, but older ones will require you to physically light it yourself with a lighter.
Old age:
The age of your furnace can also be why it overheats. As your furnace gets older and older, its performance will start to decline. However, while parts may wear out, your system should still last for about 15 years. But if you don’t follow preventive maintenance tips, it could die out much sooner. If your furnace is old and constantly overheats, its age could be the problem.
Your thermostat has the wrong settings:
Thermostats allow us to stay comfortable with ease. However, these devices can run into some problems at some point. If you have a heater blowing cold air instead of hot, your thermostat could be set incorrectly. Luckily, fixing this issue takes a matter of seconds.
As the seasons change, it’s easy to mess up your thermostat’s settings. This is especially true when fall turns to winter, which is when the furnace is cranked on for the first time. If you notice that your heater is blowing cold air, make sure to check the settings on your thermostat. Although it’s unlikely, you may have forgotten to move the switch to the ‘Heat’ position.
When looking at your thermostat settings, ensure the switch is in the ‘Auto’ position. If it’s switched to the ‘On’ setting, the furnace’s fan will still blow air even when the unit is off. This can lead to some problems. To ensure a well-functioning system, make sure the thermostat is set to ‘Auto.’ Based on the thermostat’s settings, the furnace will come on at the same time as the fan. This is the best, most eco-friendly way to stay comfortable all winter long!
