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Video · Furnaces and Heating

Common Furnace Problems: Answering What Was Actually Wrong

Most no-heat calls trace back to a short list: airflow, ignition, a flame sensor, a pressure switch, an electrical part or a worn-out blower. The useful answer is which one, and why it failed.

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What you’re seeing in this video

The clip answers a customer's question, what was actually wrong with the furnace, with two pictures. First, an old furnace blower housing sits on a patio under a list of signs that a system is due for replacement, led by age and frequent breakdowns.

Then a tech in a black SwiftPro shirt and red gloves kneels at a newly installed furnace in a closet, tools on the floor and a roll of foil tape at hand for sealing the duct connections.

Job footageSwiftPro
Topic
Furnaces and Heating
Length
0:14
Posted
August 30, 2026
Shot by
The SwiftPro crew, Northern Virginia

Why it matters in your house

  • Ignition problems are the most common winter call: a cracked hot surface igniter, a dirty flame sensor, or a pressure switch that won't close because the vent or inducer motor has trouble.
  • Ask your tech to show you the failed part or the reading that proved it. A blower capacitor out of spec or an igniter with no continuity is a clear answer you can check.
  • When the repair list keeps growing on a furnace past 15 years, the honest answer to what's wrong can be the whole system. That's when replacing beats chasing the next part.

Why is my furnace running but not heating?

If the blower runs but the air is cool, the burners either aren't staying lit or never lit. That's often an igniter, a flame sensor, a pressure switch or a gas supply issue. Check that the thermostat is set to heat and the filter isn't packed. If both look fine, it's time for a tech with a meter.

Want it done at your place? See Furnaces and Heating at SwiftPro or call (703) 997-9757.

More videos from the SwiftPro crew

An open gas furnace in a basement mechanical room with on-screen labels for the heat exchanger and blower motor.0:21Parts of a Furnace: What's Inside and the Job Each Part DoesTyler Griffin in a grey SwiftPro hoodie and khakis with a lineup of six crew members in front of a wrapped SwiftPro van, a big '$67' price on screen and phone 571-470-0995.0:23Furnace Inspection Before Winter: Tyler and the Crew Bring It BackTwo techs carry out an old furnace cabinet in an unfinished basement.0:13An Old Furnace Out and a New Rheem Gas Furnace InA young tech in a navy work jacket wires a new electric heat strip kit into an open air handler in a utility room, using a Milwaukee tool, with the boxed heating elements on the floor.0:31Furnace Part Replacement That Isn't a Furnace: New Heat StripsAn old gas furnace with its panels off in a closet, then two techs carry a boxed new furnace up a snowy townhouse sidewalk and a bald tech and a bearded tech wire it in.0:49Rusty Furnace on a No-Heat Call, and the New One in the SnowTwo techs pull an old furnace in a closet, then a tech kneels at the new gas furnace with fresh venting and a condensate setup.0:15How Old Is Too Old for a Furnace? Sometimes the Unit Answers

See all 234 SwiftPro videos

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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276

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