Find out why your house is doing that.

Clear, illustrated guides to the water heater, furnace, plumbing and wiring in a typical home: how each one works, what usually goes wrong, what you can safely check yourself, and when to call a pro.

Cutaway illustration of a two-story house showing where the furnace, water heater, sump pump, breaker panel, heat pump and drain lines are located

Start with the system that’s acting up

Water heaters

Popping and rumbling, leaks at the base, no hot water, a pilot light that won’t stay lit.

Heating & cooling

A furnace that short-cycles, a heat pump blowing cold air, an AC coil that freezes over.

Plumbing & drains

A toilet that keeps running, gurgling drains, a sump pump that won’t stop, low water pressure.

Electrical

Breakers that keep tripping, a GFCI outlet that won’t reset, lights that flicker.

Latest guides

The first guides are being written now. In the meantime, pick a system above.

Smell gas? Don’t troubleshoot. Leave the house now, don’t flip switches on the way out, and call your gas utility or 911 from outside.

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