# Fault Finder Pro

> Industrial electrical troubleshooting guide with fault diagnosis, code lookup, and reference tools. (iPhone/iPad app by Richard Johnson.)

- Source: https://appshunter.io/ios/app/fault-finder-pro/id6785652430 (this page in markdown: same URL + `.md`)
- Developer: [Richard Johnson](https://appshunter.io/developer/6785652433)
- Category: Utilities, Productivity
- Price: $7.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.1 · 20 MB
- Languages: American English
- Released: 2026-07-13
- Data updated: 2026-08-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/fault-finder-pro/id6785652430/reviews.md

## What is 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,

## Key features

- Step-by-step fault diagnosis
- Searchable fault code database
- NEC wire sizing table
- Voltage drop calculator
- Ohm's Law calculator
- Motor nameplate decoder


## Frequently asked questions about Fault Finder Pro

### What kind of electrical faults can Fault Finder Pro help diagnose?

Fault Finder Pro offers step-by-step fault diagnosis for common industrial electrical problems including motor issues, breaker trips, VFD faults, 3-phase power problems, transformer faults, generator issues, and PLC faults for Allen-Bradley models.

### Does Fault Finder Pro work offline?

Yes, Fault Finder Pro is designed to be used offline, providing quick access to troubleshooting information without needing an internet connection on the job site.

### What specific fault codes can I look up in Fault Finder Pro?

The app includes a searchable database for fault codes from Allen-Bradley PowerFlex VFDs, Fanuc CNC and Robot alarms, Siemens SINAMICS drives, and Yaskawa drives.

### What electrical reference tools are included in Fault Finder Pro?

Fault Finder Pro includes an NEC wire sizing table, a 3-phase voltage drop calculator, a conduit fill reference, and 3-phase formulas to assist with electrical calculations.

### How accurate is the Ohm's Law calculator in Fault Finder Pro?

The Ohm's Law calculator in Fault Finder Pro allows you to enter any two values and it will solve for the remaining ones, providing accurate calculations for electrical circuits.

### What devices is Fault Finder Pro available on?

Fault Finder Pro is available on iPhone, iPad, and iPod devices, as indicated by its supported devices list.

### How much does Fault Finder Pro cost?

Fault Finder Pro is a paid application, with a price of $7.99. It does not appear to have any in-app purchases or advertisements.

### How often is Fault Finder Pro updated?

The latest version of Fault Finder Pro is 1.1.0, which was last updated on August 3, 2026. This suggests a relatively recent update cycle.

## Version history (last 2 releases)

### 1.1.0 — 2026-08-03

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.

### 1.0 — 2026-07-13

No release notes.

## Related topics

[fault current finder](https://appshunter.io/ios/topics/fault-current-finder)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*