HVAC Troubleshooting

What's your system doing?

Free HVAC troubleshooting videos from a tech with 20 years in the field. Pick the symptom to see the most likely causes, then watch the fix.

Cooling

Heating

Troubleshooting videos

A look inside AC Tool Pro

Tap any screen to open it full size. Everything here is in the app, on any phone or tablet, no install needed.

DiagnoseEnter suction, head, and line temps. It returns a plain-language verdict for charge or static pressure, in cooling or heating.
3D componentsSpin any major component 360 degrees and tap a point to see what it does and how it fails.
PT chartNine refrigerants, saturation temp to pressure, with bubble and dew for the blends.
Field calculatorsAirflow CFM by grille traverse, plus BTU, capacitor, and static pressure math that updates as you type.
Component libraryEvery part by system, searchable, with heat-pump-only items flagged.
AI troubleshooterDescribe what the unit is doing and get the most likely cause first.

Get AC Tool Pro Used by 200+ techs. $20 a month or $200 a year.

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Written by Taddy

Licensed General Mechanical Contractor in Tennessee with 20 years in the field. Taddy teaches HVAC to about 250,000 subscribers on Taddy Digest.