What's it doing?
Pick the symptom. Each page lists the likely causes, the checks that are safe to do yourself and the point where a licensed pro should take over. If you smell gas, leave the house and call your gas utility from outside.
Gas tank water heater
- Why does my hot water run out so fast
- Why is my hot water rusty
- Why is my water heater leaking from the bottom
- Why is my water heater not making hot water
- Why won't my water heater pilot stay lit
- Why is my water heater making a popping noise
- Why is my water heater relief valve leaking
- Why does my hot water smell like rotten eggs
Gas furnace
- Why is my furnace blowing cold air
- Why is my furnace leaking water
- Why is my furnace making a loud noise
- Why does my furnace keep turning on and off
- Why won't my furnace ignite
Central air conditioner
- Why is my AC freezing up
- Why is my AC humming but not running
- Why is my AC leaking water inside
- Why is my AC running but not cooling
- Why does my AC keep turning on and off
- Why does my AC keep tripping the breaker