What's wrong?

HVAC Troubleshooting

Pick the symptom that matches what you’re seeing. Each guide covers what’s normal, what you can safely check yourself, and when to shut the system off and call.

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Smell gas or hear a CO alarm? Leave the house now, then call 911 and Xcel Energy at 1-800-895-2999 from outside. Don’t switch lights or appliances on or off.

Furnace

Furnace won’t turn onFurnace blowing cold airFurnace turns on and offBanging, squealing or hummingBurning, electrical or gas smellBlinking light / error codeCO alarm or carbon monoxide worry

Air conditioner

AC won’t turn onAC running but not coolingIce on the AC lines or coilWater leaking from AC or furnaceHail damage to the outdoor unit

Heat pump & mini-split

Heat pump blowing cold airHeat pump covered in iceMini-split not heating or cooling

Thermostat & controls

Thermostat blank or not responding

Still stuck? 24/7 emergency HVAC repair across 52 Denver-metro communities, or call (720) 466-7983. Thinking about replacing instead? Try the repair or replace calculator.

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Location Colorado, CO
Hours Mon-Sat: 7AM-8PM | Emergency: 24/7
(720) 466-7983