What Should I Do If My Heater Is Not Working in My House?

If your home heater is not working, start with a few safe checks to rule out simple issues before you call for service. The most common culprits are thermostat settings, a tripped power switch or breaker, and a clogged air filter that forces the heater to shut down. If heat doesn’t return, the problem is likely in the ignition system, blower, or control board and needs a technician; no-heat during freezing weather is urgent. Technicians in the Treasure Valley often find an accidentally switched furnace service switch or a dirty filter behind many no-heat calls. 24/7 emergency help and free second opinions on major repairs are available after your basic checks.

Try these quick checks first:

• Set thermostat to Heat and 3–5° above room temp; replace batteries if used.
• Replace a dirty filter and reopen all supply/return vents.
• Verify the furnace switch is On and reset any tripped breaker once.
• Note any error code or flashing light and power-cycle the unit once.

If you smell gas or see scorch marks, leave the area and contact your utility before any HVAC service.

Updated: 2026-04-03

Need help in Meridian, ID? Call (208) 378-6624 or book online.