What's the system doing?
Pick the equipment, tap the fault. I'll walk it with you like a senior tech on the truck.
Professional-use reference — confirm consequential decisions with the exact unit's OEM literature, measurements, and applicable requirements.
Common calls
PREVIEW
Toolbox PRO
$29/mo · free during beta
🔒Model-specific AI — answers grounded on the OEM service manual for the exact unit in front of you
🔒Rating-plate scan — photo the nameplate, get model, tonnage, charge & fault-code legend instantly
🔒Job reports — branded PDF of readings + diagnosis to attach to the invoice
🔒Logbook & history — every diagnosis saved per customer/unit
Fault code lookup
Public release: verified fault-code records only. A bare code is never one authoritative answer: resolve the manufacturer, family, model, and control context before relying on a match.
Field tools
Component encyclopedia
PT chart
📊 Pressure–Temperature chart
Saturation pressures · psig · 5°F steps
Reference-grade data for field triage — verify critical charging decisions against the OEM PT card on the equipment. High-glide blends (R-407C): use dew for superheat, bubble for subcooling, charge liquid-only.