372 how-to guides
Step-by-step how-to guides, explainers and repair tips for hvac, furnaces, ac and indoor air quality — in plain English.
Your furnace starts, the burners light, and then everything shuts off a few seconds later. A dirty flame sensor may be the reason—but that doesn’t automatically mean the sensor needs replacing. Knowing when to…
If your furnace lights for a few seconds, then shuts off and tries again, a dirty flame sensor…
A furnace that starts, lights for a few seconds, then shuts off may have a dirty flame sensor—but…
Your furnace can light its burners and still shut itself down seconds later. One small part is often…
Your furnace can light, roar for a few seconds, and then shut right back down. One small part…
A flame sensor is a small safety device with a big job: it checks whether a burner has…
A furnace that starts, pauses, tries again, and then shuts down can make you wonder whether its ignitor…
A furnace that clicks but won’t light can make you wonder whether a dirty ignitor is to blame.…
A furnace ignitor is a small part with a big job: it helps your furnace light safely when…
A furnace can have power, a working thermostat, and plenty of gas—and still leave you shivering because one…