North Dakota Heating
North Dakota Heating
24/7 North Dakota heating pros

Furnace Blowing Cold Air

A fan moving cold air through the ducts pulls heat out of the house faster than leaving it alone, so it's worth calling before the place drops much further.

Tap to Call(866) 661-2784

When this becomes an emergency

What a pro does

The fan side is working; the fire side isn't. A tech confirms that by watching a full ignition attempt, checking whether the ignitor glows and the flame actually establishes, then reading whether a flame sensor coated in oxide is telling the board no flame exists and dropping the burner out three seconds after light-off. On propane systems a regulator that has frosted over or a tank drawing down in extreme cold can starve the burner the same way, which is why fuel pressure gets checked before parts get quoted. Long-run lockouts also need clearing properly rather than by pulling the disconnect.

Frequently asked questions

Most control boards keep the blower going to clear residual heat out of the exchanger, and a board sitting in lockout will often leave the fan on indefinitely as a safety measure.
It can. A tank that's low on liquid propane loses vaporization capacity when the temperature crashes, and the burner starves for pressure right when demand is highest.
Yes, usually within a few seconds of ignition. The sensor carries a tiny current through the flame, and a film of residue is enough to break that signal.
One reset attempt is reasonable and sometimes clears a soft lockout. Repeating it for an hour just keeps dumping unburned fuel through the same failed sequence.

Furnace Blowing Cold Air?

Get connected with a local pro now.

Tap to Call(866) 661-2784

Keep going

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