Readers ask: Why Is My Heater Blowing Out Cold Air?

What do I do if my heater is blowing cold air?

When your furnace blows cold air, try turning the heating unit off and on. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. With a dirty flame sensor, your gas burner won’t stay lit, causing the air to go cold soon after the furnace turns on.

Why is cold air coming out of my electric heater?

More often than not, electric heaters blow cold air when its filters are clogged, and that’s why it’s the first thing you should check. Start by turning your heater off and inspecting the filters. If the filters are caked with dust, then it’s likely the culprit behind your heater’s malfunction.

Why is my furnace running but no heat?

Furnace filters Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter.

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Is it normal for cold air to come out when heat is on?

Clogged air filters could be causing cold air to blow out of your vents. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat.

What to check if heat is not working?

Check the Batteries in Your Thermostat If your thermostat runs on batteries, try replacing them. You’d be surprised how many times this simple fix gets a heater going again. It may sound like a no-brainer, but you do need to turn your thermostat to the “heat” or “automatic” setting before your heater will click on.

Why is my space heater not blowing hot air?

CAUSE: The most common cause of heater not blowing hot air could be a blown circuit or resistor. SOLUTION: For this you may have to open the case and start testing the circuit by making use of a voltage regulator. If the circuit is broken, you can either replace it yourself or have a professional do the job for you.

Can a dirty furnace filter cause no heat?

Dirty furnace filters Is your furnace firing up but not blowing heat as hard as normal? That’s because air filters trap dust, dirt and debris like hair, which over time can restrict or block vital air flow, overheating the heat exchanger and preventing your furnace from working as it should.

Why is my heater not heating?

Often, the issue is that the heating system is simply dirty. If your furnace has a dirty blower, the blower could cause equipment failure. In short, a dirty blower can cause the heat exchanger to fail. Dirty air filters could also be the reason your heater stopped working.

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