Knowing how to reset your furnace can save you a service call. It can also clear certain lockouts that stop the heat. Sherwood Mechanical explains the safe way to do it: turn off the furnace power switch, wait about 30 seconds, and switch it back on. The guide also explains an important warning: if your furnace locks out again after a reset, there's an underlying issue that needs a technician. Read the full troubleshooting guide with 11 practical checks for Sherwood Park homeowners.