What it usually means, and how urgent it is
40 symptom guides. Each asks a few questions, then gives an urgency level, the steps to take right now, and who to call. Gas, carbon monoxide and electrical problems always go to the safety exit first.
Happening now? Start here
I smell gasLeave first. Call from outside.CO alarm is soundingGet to fresh air first. Then call.Sparks or a hot outletCut the power if you can do it safely. Otherwise leave.Water near electricsStay out of the water. Power off only from somewhere dry.Ceiling sagging or structure movingGet clear of it. Then call.