If your furnace isn’t blowing warm air, or if it does so intermittently, checking a few things first and performing some troubleshooting can save you time and money. You’ll only need to call a professional if your furnace really does need repairs.
Duct System – Try to isolate the cause by checking if all the rooms in your home are not getting warm air. If some of the rooms are getting warm air, then you may have an issue with the dampers, not necessarily the ducts themselves. Otherwise, look for long uninsulated runs, damaged insulation and possibly holes in the ducts. The furnace may be putting out sufficient heat but could be losing it along the way.
Air Filters – Clogged filters can reduce the clean air that circulates through your HVAC system, and in severe cases, can completely block airflow. Ideally, filters should be cleaned every six months or changed, if disposable. You may need to clean them as often as every month during months of heavy use, such as during winter and summer seasons. Turn off the furnace, clean the filters and turn it back on again and see if you’re getting warm air.
Air Conditioner May Be On – While modern HVAC systems prevent both modes from operating at the same time, it nevertheless happens in homes with manually controlled independent heating and cooling. Take a moment to check if the air conditioning may be accidentally powered on. Likewise, check the thermostat if it’s accidentally switched to cooling, or if the temperature is set several degrees lower. A programmable thermostat can help ensure that the temperature is set according to season and will warn you if something is wrong with your HVAC system.
Fan Limit Switch – Your furnace should have a fan limit switch, which lets you set the minimum and maximum furnace temperatures. Move the upper limit pointer to a few degrees higher, and see if the dial moves. If it does, wait a few minutes and check the rooms if they’re getting warm air. Set the limiter back to its original setting and see whether the warm air stops or not. If it doesn’t, it means the fan limit switch just needed to be jogged a little bit. If the issue persists, then you may have a faulty fan limit switch or wiring, in which case you’ll need to call a professional for heating repairs.
Keep Your Furnace Working Great With Fire and Ice HVAC, Inc.
For your HVAC repair, maintenance and installation needs, call Fire and Ice HVAC, Inc. today at (703) 496-5527. You can also fill out our contact form to schedule a free estimate. We serve Woodbridge, VA, and the surrounding areas.