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Heating · New Hampshire

Furnace Short Cycling

A system that starts and stops all day burns fuel it never turns into heat and wears out its ignition components early, so it deserves a look now.

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When this becomes an emergency

What a pro does

Short cycling has a handful of usual causes and they get separated by watching a real cycle end to end. Overheating from restricted airflow is first on the list, because a plugged filter or a closed-off return will drive the high limit open every time. A flame sensor losing its signal partway through the burn produces the same pattern from the other direction. Thermostat placement matters too, since a stat sitting where warm air pools satisfies early and leaves the house's far rooms cold. In a farmhouse where rooms were added over the decades, equipment sized for the original footprint or oversized for a remodeled one will cycle short by design rather than by fault.

Frequently asked questions

It's one of the most common causes. Starve the return air and the heat exchanger overheats, the limit switch opens, and the burner shuts down long before the house is warm.
Every start uses more fuel than steady running does, and the ignition components take the wear, so the cost shows up both on the fuel delivery and in shortened part life.
Yes, and an oversized unit satisfies the thermostat quickly while leaving the rooms furthest from the equipment behind, which reads exactly like a fault even though nothing is broken.
It varies with the equipment and the weather, but a system firing every few minutes in steady cold is behaving differently than one that runs longer, calmer cycles.

Furnace Short Cycling?

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