No Heat

No heat at all during a cold stretch is treated as priority work, so call and describe when it quit and what it was doing beforehand.

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When this becomes an emergency

The thermostat is asking for heat and nothing in the house responds.
The furnace door switch was disturbed after a filter change and the unit went dead.
A fault light on the equipment is lit steady or blinking.
The temperature indoors keeps dropping hour over hour.

What a pro does

A dead system almost always has a simple explanation somewhere upstream. The disconnect switch, the breaker, the door safety switch on the blower panel, and the low-voltage fuse on the board are the usual finds, and a panel that isn't seated properly after a filter change will hold that switch open and leave the furnace completely lifeless. Once power is confirmed, the tech verifies the thermostat is actually closing the heat circuit, then follows the ignition sequence from inducer through pressure switch to burner. Whatever safety stopped the process is a clue about the real fault, not the fault itself.

Frequently asked questions

Can a furnace panel really stop the whole system?

Yes. There's a plunger switch behind that panel that cuts power when the door is open, and a panel put back slightly crooked leaves it pressed out.

Does a steady fault light mean something different from a blinking one?

Usually, and the legend inside the access door explains the difference. Counting the pattern before calling gives the tech real information to work from.

How should the thermostat be set while waiting for service?

Leaving it set at a normal temperature is fine. Cranking it far higher doesn't make anything happen faster and can confuse the diagnosis.

Is it safe to use the oven or a stove for heat?

No. Cooking appliances aren't vented for continuous heating and using them that way is a genuine carbon monoxide risk.

No Heat?

Get connected with a local pro now.

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Keep going

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