Why Won\u2019t My Furnace Turn On?
A furnace that will not start on a cold Utah County morning is stressful. Several common issues can be checked before you call for service.
Common Causes
- Thermostat set wrong, dead batteries, or a wiring issue
- Tripped breaker or a blown fuse
- Very dirty filter triggering a safety shutoff
- Dirty flame sensor so the burners will not stay lit
- Blower door not fully closed, which opens a safety switch
What You Can Check Yourself
- Set the thermostat to heat and raise it above room temperature, and replace the batteries
- Check the breaker and reset it one time
- Replace a dirty filter and make sure the furnace panel is fully closed
When to Call Air Plus Heating
If the quick checks above do not solve it, the problem needs a trained technician. Air Plus Heating has served Utah County since 1982 with honest pricing, free estimates, and same day and 24/7 emergency service. Learn more about our furnace repair in Utah County, or see all of our HVAC troubleshooting guides.
Related Questions
Why Won’t My Furnace Turn On?
A furnace that will not turn on is often caused by a thermostat issue, a tripped breaker, a clogged filter, a dirty flame sensor, or a safety switch that shut the unit down. Check the thermostat, breaker, and filter first, then call a technician if it stays off.
Why does my furnace start then shut off quickly?
This short cycling is often a dirty flame sensor, a clogged filter, or an overheating limit switch. It should be cleaned or checked so it runs safely.
Should I keep resetting my furnace?
Reset the breaker only once. If it trips again or the furnace still will not run, stop and call a technician, since repeated resets can be unsafe.
Need HVAC Help in Utah County?
Call (801) 362-5115 for same day and 24/7 emergency service, or request a free estimate.