Skip to main content
    Top Industrial Talent
    Featured Talent
    Markets
    Featured Jobs
    Sign InLet's Talk
    Back to All Tools

    Diagnosis Tools

    Symptom-first troubleshooting for HVAC/R and controls. Decision trees plus 2,800+ fault codes across chillers, VRF, boilers, refrigeration, and building automation , each tied back to manufacturer service literature.

    Not sure where to start?

    Describe what you are running into and we will match you to the right tool.

    Which tool do I need?

    Describe the problem, get matched in one step.

    Tell me the symptom or fault code and I'll route you to the right diagnosis tool.
    Or browse every tool
    Compressed air
    Report BuilderZero-to-Hero Proposal BuilderControl Strategy AdvisorDowntime CostEquipment Health ScorecardHeader Pressure OptimizerLeak Load EstimatorReceiver Sizing CheckCompliance ChecklistDispatch On-Time KPIMulti-Site KPI RollupOvertime ReductionPM Schedule BuilderParts Reorder CheckSLA Response TrackerService Contract HealthTechnician ScorecardWeek Route & Dispatch PlannerAir Quality SelectorBHP ↔ SCFM ConverterCAGI Model FinderMoisture Load / Dryer SizingOil Carryover / ISO ClassPM Interval ReferencePipe SizingQuote BuilderSpecific Power RaterSystem Audit ScorecardSystem Sizing (SCFM)Energy & Leak AuditCompressor TroubleshooterAir Dryer DiagnosticCompressor Fault CodesPipe / Header SizingPM Interval PlannerMaintenance TrackerCAGI Data FinderControl Strategy / Receiver SizingOvertime / Labor CostService SchedulerAirSpec CompareVSD ROI CalculatorAir Quality / ISO 8573-1 SelectorSystem SizingAudit Scorecard
    EPA 608 / HVAC-R
    EPA 608 Practice TestPT Chart LookupSuperheat / Subcool CalculatorRefrigerant Retrofit WizardRefrigerant Price TrackerHVAC/R TroubleshootingChiller Fault CodesHVAC & VRF Fault CodesBoiler Fault CodesRefrigeration Fault CodesPPE & Safety Quick-CardKnowledge Base Search
    Controls & automation
    Air Quality Class PickerAnalog ScalerArc-Flash PPE and Boundary PickerCompressor Control Mode SelectorCompressor Trip DiagnoserConduit Fill CheckerElectrical for CompressorsInterlock Trip CheckerLoop Power and Burden CheckerMotor Nameplate DecoderPeck Drill Cycle HelperPower Factor and Capacitor kVAR HelperRTD and Thermocouple ReaderShock Approach Boundary LookupSiemens to Allen-Bradley TranslatorSpeed, Feed and G/M-Code DecoderTapping Feed (G84)Transmitter Range ScalerVFD to Motor Cable-Length CheckerVoltage Drop and Wire-Run CheckerWork Offset and Tool Comp DecoderAddressing DecoderBoolean Ladder TrainerData Type SizerIP / NEMA Enclosure LookupISA Tag DecoderNumber Base ConverterScan Cycle ExplainerTimer Preset HelperPhase Sequence IdentifierPower Factor Correction SizerThree-Phase Power and CurrentTwo-Wattmeter Power ReaderVoltage Imbalance CheckerWye vs Delta ConverterControls Field ToolsPLC 101 ToolkitControls Skills CheckThree-Phase Power ToolsBAS Controls Fault Codes
    Pump & pipe
    Blower SizingMotor Wire SizerPump-Down TimeAffinity LawsCavitation DiagnosticCompressed-Air PipeFitting LossesLiquid Pressure DropMinimum Continuous FlowNPSH MarginPipe Support SpanPipe Velocity & SizePump Check ReportPump PowerPump Selection SummarySpecific SpeedThermal GrowthVFD Savings (Static-Corrected)Wall Thickness (B31.3)Water HammerEquipment ElevationInstrument Straight RunPipe Rack SizerPlatform & Ladder AccessPlot-Plan SpacingValve AccessPump & Pipe Field ToolsPump & Pipe Layout ToolsPump Equipment & Electrical
    Recruiting & hiring
    Super ScreenerMeta Job Builder
    Candidate
    Resume CoachCover Letter GeneratorPrep Agent

    HVAC/R Troubleshooting

    Decision tree

    Walk symptom-driven decision trees for HVAC and refrigeration faults. Symptom in, next step out.

    Open tool →

    Chiller Fault Codes

    287 codes

    287 codes for centrifugal and screw liquid chillers. Trane, Carrier, York, Daikin, Climacool, Multistack.

    Open tool →

    HVAC & VRF Fault Codes

    841 codes

    841 codes for split DX, heat pumps, rooftops, and VRF. Carrier, Trane, Lennox, Mitsubishi, Daikin, LG, and more.

    Open tool →

    Boiler Fault Codes

    667 codes

    667 codes for fire-tube, water-tube, condensing, and combi boilers. Lochinvar, Weil-McLain, AERCO, Viessmann.

    Open tool →

    Refrigeration Fault Codes

    603 codes

    603 codes for racks, walk-ins, cases, and ice machines. CPC/Emerson E2, Carel, Danfoss, Hussmann, Manitowoc.

    Open tool →

    BAS Controls Fault Codes

    429 codes

    429 codes for building automation. Metasys, Niagara, Distech, Schneider, Desigo, WebCTRL, BACnet, Modbus.

    Open tool →
    Related family

    Compressor & Air Dryer Diagnostics

    Compressor Troubleshoot, Air Dryer Diagnostic, and 509 Compressor Fault Codes live inside the Compressed Air family.

    Open Compressed Air Tools

    Every branch is cited

    Decision trees and fault codes reference manufacturer service manuals, ASHRAE, and 40 CFR Part 82, the primary sources the industry runs on.

    Top Industrial Talent

    • About Us
    • Our Services
    • Contact

    72 HOURS

    • The First Interview Is Already Done.
    • Candidates earn it. Employers commit to it.
    • Meet 72 Hour Talent
    • Explore 72 Hour Jobs

    Markets

    • Compressed Air
    • Pumps
    • Vacuum & Blowers
    • HVAC & Refrigeration
    • PLC & Industrial Automation
    • Industrial M&E
    • Manufacturing Leadership
    • Power Generation

    Resources

    • What We Built
    • How We Work
    • How We Recruit
    • Blog
    • Resume Builder
    • FAQ
    • AI Tools

    Community

    • Join Our Network
    • Browse Jobs
    • Success Stories
    • Testimonials

    864-900-2144

    American Recruiters

    A franchise of American Recruiters

    © 2026Top Industrial TalentAll rights reserved.
    Privacy PolicyTerms of ServiceAccessibility