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Make sure the thermostat is set to heat, the furnace power switch is on, and the filter is clean. Some units have a reset button you can try once.
Common fixes like igniters and flame sensors are on the smaller side; motors and control boards run higher. Get a written quote before authorizing work.
Once a year, ideally in the fall before you need it.
Running the fan alone won't heat your home and may wear the system. If there's no heat, it's best to wait for the tech.