There are several reason why a central heater might blow cold instead of warm air and these include a blown out pilot light, an overheated furnace or its thermostat is set to "On." These three issues are the most common causes of why a central heater will blow cold air and the ways to fix these issues are relatively simple.Know More
The following are the three common reasons why a central heater blows cold air and how to troubleshoot and fix the issue.
Blown out pilot light
A pilot light is a small flame that is constantly lit within a furnace and is on standby to light up the furnace when the homeowner turns on the heater. Follow the instructions that came with the heater's manual in relighting the pilot light. If the pilot light refuses to light up, check if the gas valve is set on "On" or if the pilot light needs cleaning.
An overheated furnace also causes cold instead of warm air to come out of the vents. This is because once the furnace gets too hot, the high temperature triggers the limit switch that turns off the burners but keep the blowers running to cool the furnace before shutting down. Dirty furnace or air filters are the common causes of overheating furnace and cleaning them out will usually solve the problem.
Thermostat set on "On"
If the setting of the thermostat is set on "On," the blower will keep on releasing cold air. Adjusting the setting to "Auto" will solve this simple issue.Learn more about Heating & Cooling
The benefits of a central air conditioner include noise control, filtered air, enhanced comfort and a covert appearance. Other benefits are less energy consumption, a consistent supply of comfortable temperatures and an increase in overall home value.Full Answer >
While used portable air conditioners are easy to find online, most used central units are purchased through an installer or with a local store acting as a middleman. Most homeowners keep their existing air conditioners for as long as possible, which means used systems are often prohibitively expensive to maintain.Full Answer >
According to HofStuffWorks, troubleshooting a central air conditioner starts by identifying the problem. These may include the unit not working, not stopping or not cooling.Full Answer >
To purge a central air system of odors caused by mold or mildew, replace the filter, inspect and clean the top of the air conditioner, clean the condensate drain, and evaluate the results. This procedure takes several days and requires a new filter, a wrench, bleach and a scrub brush.Full Answer >