News and Helpful Tips

Why is My Furnace…?

Do you have burning questions about your furnace? Maybe you’ve searched the internet for answers and came up short. Look no further! Here are the most common search engine queries—and answers—about furnace problems and heating repair:

Why is my furnace leaking water?

Furnaces use evaporator coils to transfer heat into air ducts throughout your home. Refrigerant within the coils turns into gas, condenses, and releases moisture. The condensation should drain through a condensate line and into a floor drain. If the line is blocked, damaged, or not pitched downward toward a drain, water could leak into the furnace. The floor drain could be clogged with dirt, or the humidifier may be malfunctioning. Schedule repair service right away if you notice water leaking around your furnace.

Why is my furnace freezing up?

Evaporator coils can build up ice as the refrigerant passes through them. Frost or a small layer of ice on outdoor coils is normal; a defrost cycle should address the problem. But built-up ice will insulate the coils and make the issue worse. Freezing could be caused by low refrigerant levels or malfunctioning defrost controls, thermostats, or sensors. Dirt buildup is also a common cause, so regular maintenance is key. If your furnace is completely covered in ice, turn off the system and contact Heating & Cooling Two for help.

Why is my furnace filter black?

Your furnace filter should prevent large pieces of dust from getting into the system and improve the quality of indoor air. A blackened filter, clogged with dust and debris, can create unhealthy indoor conditions.

  • Candle soot – if you burn candles frequently, soot resides in the air and circulates through your HVAC system. Keep candle flames away from vents, fans, and hallways. Don’t burn candles made of petroleum jelly or vegetable oil.
  • Carbon Monoxide – Odorless, invisible carbon monoxide can cause soot to accumulate on a filter. Carbon monoxide can come from a leaky gas fireplace, gas water heater, or the furnace itself.
  • Mold – Condensation on your furnace mixed with the dirt and dust that accumulate on your filter creates a damp environment for mold growth.

Why is my furnace running all the time?

The biggest cause of an overactive furnace is a dirty air filter. A clogged filter restricts airflow and overheats your furnace. The furnace tries to cool itself down by running the fan continuously, or short cycling. Another reason could be that your ductwork is loose or leaking hot air into the attic. Your HVAC technician can change your filter, seal leaks with HVAC tape, and put detached ductwork back together.

Why is my furnace not igniting?

If your furnace makes a clicking noise but does not turn on, your ignition system may be malfunctioning. The flame sensor that opens that gas valve for the burners could be covered in soot, causing the igniter to spark (or click) to no avail. The flame may not be igniting because of an incorrect mixture of gas and air. Your pilot light or ignition sensor may need replacing, or you may have a gas leak. Regardless, you’ll want your heat to work in the cold winters, so contact an HVAC technician right away.

Why is my furnace so loud?

If you hear scraping, banging, or whistling coming from your furnace, it may be a small fix, or one needing immediate repair. The fan bearings, blower wheel, or blower belts could be worn out and need replacement. Rattling could indicate loosened ductwork.

On the other hand, a small explosion, called an ignition roll out, may occur when the furnace starts up. This is caused when gases build up in the combustion chamber and ignite all at once. Problems like these can be dangerous and need immediate attention. Heating & Cooling Two offers emergency service, so contact us today.

Why is my furnace whistling?

Whistling noises can be caused by gaps in the duct or a clogged filter. Your ducts could be too small, and your furnace may need greater air flow. Contact Heating & Cooling Two for a free estimate.

Why is my furnace beeping?

A beeping sound or blinking light on your furnace could signal a condensate blockage or pilot light out. It could be any of the previously mentioned problems, so you should call an HVAC professional to have it inspected.

Heating & Cooling Two can diagnose any problems your HVAC system may be having. Contact us today for a free estimate. A burning question might save your furnace from costly breakdowns.