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Observe—do not repair

Safe HVAC Troubleshooter

Organize visible symptoms and try only low-risk checks that do not require tools, panels or contact with equipment wiring, fuel or refrigerant.

Stop and leave the area when appropriate.

Do not continue this tool for a gas odor, carbon-monoxide alarm, smoke, sparking, active fire, severe burning odor or water contacting electrical equipment. Move to safety and call 911, the fire department or the gas utility as appropriate.

Planning aid only. This tool provides general education from visitor-entered information. It is not a diagnosis, Manual J load calculation, equipment selection, safety inspection, proposal, price, warranty or guarantee. Property conditions and equipment requirements must be reviewed onsite.
Never use this website to: bypass a safety device, open a service panel, handle refrigerant, test live voltage, work on gas or oil components, repeatedly reset a breaker, thaw equipment with heat, or keep operating equipment that is leaking, smoking, sparking or producing a strong odor.
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