Furnace repair in San Jose, CA

When a furnace stops working properly, a few simple checks can often point to the problem before you call for furnace repair. This guide walks through the basic steps a homeowner can safely try first, none of which require opening up the unit.

Working through these checks in order can rule out the most common causes and, in some cases, get the furnace running again on its own without a service call.

How to troubleshoot a furnace

• Check the thermostat: make sure it is set to the desired temperature and in “heat” mode, and replace the batteries if needed.
• Check the air filter: a dirty filter can make the furnace run inefficiently or shut down, so replace it if it is dirty.
• Check the circuit breaker: if the furnace has no power, see whether the breaker has tripped.
• Check the gas supply: for a gas furnace, confirm the gas supply is turned on.
• Check the pilot light: if the furnace has a pilot light, make sure it is lit, since a furnace will not heat with the pilot out.

These steps cover the everyday causes, but anything beyond them, such as a faulty igniter, a bad sensor, or a tripped safety switch, calls for a trained technician with the right tools. If you have worked through these checks and the furnace still will not run, it is time to bring in a professional. Nur HVAC technicians diagnose the issue at the source and repair the furnace so it runs efficiently and safely, testing the system once the work is done.