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  • Fault Finder Pro screenshot 1
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  • Fault Finder Pro screenshot 4

About Fault Finder Pro

Fault Finder Pro is a fast, no-nonsense troubleshooting reference built by an industrial electrician for industrial electricians and maintenance technicians. Stop wasting time digging through manuals on the job site. Everything you need is right here — offline, organized, and ready when you are. STEP-BY-STEP FAULT DIAGNOSIS Walk through guided fault trees for the most common industrial electrical problems. Answer yes/no questions and get a recommended action fast. - Motor won't start - Breaker keeps tripping - VFD faults - 3-phase power issues - Transformer faults - Generator and transfer switch faults - Servo and motion control faults - Panel and distribution faults - Allen-Bradley PLC faults — MicroLogix, CompactLogix, and ControlLogix (communication, I/O, and program faults) FAULT CODE LOOKUP Searchable database of fault codes with cause and fix for every code. - Allen-Bradley PowerFlex VFDs - Fanuc CNC alarms - Fanuc Robot alarms (SRVO, SYST, MOTN, MEMO, COLL, and more) - Siemens SINAMICS drives - Yaskawa drives ELECTRICAL REFERENCE - NEC wire sizing table — AWG 14 through 500kcmil - 3-phase voltage drop calculator - Conduit fill reference - 3-phase formulas TOOLS - Ohm's Law calculator — enter any 2 values, solve for the rest - Motor nameplate decoder — enter HP, voltage, and FLA to calculate overload relay, breaker size, fuse size,

What’s new

Version 1.1.0 · Updated August 3, 2026

What's new in 1.1.0 • Reorder your tabs — press and hold a category on Reference, Tools, or NFPA 70E and drag your most-used sections to the front. Your order is saved. • Save fault codes — tap the star to pin codes, and filter to your saved list. • More drives — added fault codes for ABB (ACS), Schneider Electric Altivar, Danfoss VLT, and Mitsubishi FR. • Rate the app — a quick prompt after you've used the troubleshooter a few times. • Fixes & polish — corrected a Panel/Distribution diagnostic path, the safety disclaimer now appears only on first launch, and cleaned up tab labels and buttons.

App privacy

The developer, Richard Johnson, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

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