An HVAC system that turns on but doesn’t heat usually has a control, airflow, or heat-source problem. The most common cause is a thermostat setting or a safety lockout that keeps the heaters from running even while the blower or outdoor unit is on. Other frequent culprits include a clogged filter that chokes warm-air flow, an ignition or heat-strip failure, or a heat pump stuck in defrost after the first cold snap. A technician confirms this by checking the thermostat, safeties, electrical connections, and both indoor and outdoor components end to end, then restores safe heating. We handle these issues across the Pahokee area, with same-day and 24/7 emergency help when heat is out.
Try these quick checks and note the signals before calling:
- Set the thermostat to Heat, raise the setpoint, and use Fan on Auto.
- Replace a dirty air filter and open all supply and return vents.
- Gas furnace: repeated clicking or short cycles point to ignition or a flame sensor issue.
- Heat pump: outdoor unit buried in ice for 30+ minutes or only room‑temp air suggests a defrost or refrigerant fault.
If you smell gas, trip breakers repeatedly, or see wiring damage, turn the system off and call a licensed technician.
Updated: 2026-09-06
Need help in Pahokee, FL? Call (772) 567-3100 or book online. "Our AC system was fixed that day and we will definitely use Del-Air again." — Dean D.