We take no-heat calls at every hour, and a meaningful share of them resolve in under five minutes without a part. Before you book a visit, run through these seven checks. If none of them fixes it, you will at least be able to tell us exactly what the system is doing, which makes the repair faster.
1. Check the thermostat first
Confirm it is set to Heat rather than Cool or Off, and that the setpoint is at least three degrees above the current room temperature. Battery-powered thermostats fail quietly — if the display is dim or blank, replace the batteries before anything else.
2. Look for a tripped breaker
Find the furnace breaker in your panel. A tripped breaker often sits in a middle position rather than fully off, so it is easy to miss. Switch it fully off, then back on.
If it trips again immediately, stop. That is an electrical fault and it needs a technician, not another reset.
3. Find the furnace power switch
Most furnaces have a switch that looks exactly like a regular light switch mounted on or beside the unit, often in a garage, closet or attic. They get flipped off by accident constantly — during storage, painting, or by someone assuming it controls a light.
4. Replace the air filter
A badly clogged filter causes the furnace to overheat and shut down on its high-limit switch. The classic symptom is a furnace that starts, runs briefly, then shuts off before the house warms up — over and over.
5. Confirm the gas supply
If you have other gas appliances, check whether they are working. If your stove will not light either, the issue is upstream of the furnace and belongs to the utility.
Make sure the gas valve at the furnace is in the open position, with the handle parallel to the pipe rather than across it.
6. Check the condensate drain
High-efficiency condensing furnaces produce water, and they have a float switch that shuts the unit down when the drain backs up. A furnace that will not start with no other obvious fault is very often a full condensate trap.
7. Clear the vents and returns
Furniture over a return, closed registers throughout the house, or boxes stacked against the air handler all restrict airflow enough to trigger a safety shutdown. Open everything up and give the system a clear path.
Still no heat?
Beyond this list you are into ignitors, flame sensors, pressure switches, inducer motors and control boards — all of which need proper test equipment to diagnose safely, and several of which involve gas and high voltage.
Call us any time, day or night. We carry the common failure parts on the truck, so most no-heat calls across Concord, Antioch and the surrounding cities are resolved on the first visit.