# Why won't my furnace turn on at all?

**Short answer:** Check the free stuff first: thermostat batteries, the furnace switch that looks like a light switch, the breaker, a filter clogged enough to trip the limit, and the condensate safety switch. Those five findings cost zero dollars and solve a surprising share of no-heat calls. If it still will not start, the diagnostic is $89, waived with the repair.

A furnace that is blowing cold air is [a different problem with its own page](/answers/why-is-my-furnace-blowing-cold-air/). This page is for total silence: thermostat calling for heat, furnace doing nothing. Before you call anyone, including us, run the free list, because we would rather not charge you $89 to flip a switch.

**The five free checks, in order:** First, thermostat batteries, because a dead thermostat calls for nothing. Second, the switch on or near the furnace that looks exactly like a light switch, because it is one, and painters, kids, and attic-crawlers turn it off constantly. Third, the breaker, tripped once, reset once, and if it [trips again that is information, not annoyance](/answers/why-does-my-ac-trip-the-breaker/). Fourth, the filter: a filter loaded with a summer's worth of valley dust can choke airflow enough that the furnace protects itself and refuses to run. Fifth, on furnaces with a condensate pump or safety switch, a full pan or blocked line tells the furnace to stay off, and clearing it wakes everything up.

**What the clicking means:** if the furnace clicks and hums but never lights, you have moved from this page's territory into ignition problems, usually a hot surface igniter at the end of its life, $220 to $340 flat, or a flame sensor coated in oxide, $189 to $260. Those are the two most common furnace repairs in Kern County and both are same-visit fixes off the truck.

**The one non-negotiable:** if you smell gas at any point, stop troubleshooting. Leave the house, then call the gas company and then us, in that order. Everything else on this page can wait a day. That cannot.

**What the visit looks like when you do call:** ignition sequence watched end to end, safeties tested rather than bypassed, a combustion check on every gas furnace, and a written flat price before any part goes in. About 80% of heating repairs finish same-day, and winter mornings here are exactly when you want that statistic working for you.

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