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Guided troubleshooting
Pick what the system is doing, answer a few questions about what you see, and land on the guides for that fault.
AC not cooling
Warm air from the vents with the thermostat calling for cooling.
Furnace not heating
Gas furnace with a call for heat and no warm air.
Heat pump not heating
Cool or lukewarm air in heat mode.
Outdoor unit won't start
Thermostat is calling and the indoor blower runs, but the condenser or heat pump outside doesn't.
Water leaking at the indoor unit
Water in the pan, on the floor or through the ceiling under the air handler or furnace coil.
Mini-split not cooling or heating
Ductless unit that won't run, or runs without conditioning the room.
Have a code on the board? Use the furnace, heat pump or mini-split code lookup. Prefer to browse? See guides by symptom.