Symptom → most likely cause
| Symptom | Usual suspects | What to do |
|---|---|---|
| Screen dark | 24 VDC, fuse, backlight — same electrics as any brand | Flashlight test first: the black-screen triage |
| Touch dead or drifting, display fine | Calibration drift or a worn resistive layer; something pressing the glass reads as a constant touch | Recalibrate from the offline menu; check the bezel and any overlay |
| Won't finish booting / runtime won't start | Corrupted runtime or project storage | Forced-transfer mode (below), then re-transfer from GP-Pro EX |
| Boots, but no PLC data | Comms, not the panel | the brand-agnostic comms checklist |
Forced-transfer mode: the recovery door
When the runtime is corrupt and the panel won't start normally, Pro-face terminals have a hardware way in: power the unit on while holding a finger on the bottom-left or bottom-right corner of the screen (roughly a 40-pixel zone) — the panel comes up in forced-transfer mode and accepts a fresh runtime and project from GP-Pro EX. You need the project file and a GP-Pro EX installation; unlike some competitors, the software is licensed, so make sure the license and the .prx project live somewhere findable before the outage.
The connection key and password walls
- Forgotten connection key: resettable, at a price — enter offline mode → Initialization Menu → Initialize User Memory (code 1101 when no system password is set). This wipes the project and the SRAM backup data (recipes, retained values) along with the key.
- Password-protected project: blocks upload entirely. If the original project file is lost and the project is locked, a working panel is the only copy — treat it accordingly: back up now, label the file, store it off the machine.
- The honest rule: on Pro-face, losing the project file hurts more than losing the panel. Hardware is replaceable; a locked, dead panel means rebuilding screens from photographs.
Repair or replace
Display, backlight and touch repairs run the usual $300–$1,000 and 1–2 weeks. For legacy GP2000/3000 and AGP series, spares are scarce and the decision drifts toward migration to the current SP5000/ST6000 lines — which means GP-Pro EX project conversion work. Either way the machine doesn't have to wait: the PLC underneath is still running.
Keep producing while you wait
Have the panel project export? Drop a FactoryTalk View, TIA Portal, Weintek or CSV export into our free HMI project converter — it runs in your browser, the file never leaves your PC, and every display becomes a page of buttons, indicators and values for the app, with the real tag names already in place.
Today, from a phone: the free LineKeeper app for iPhone and iPad speaks EtherNet/IP, Siemens S7 and Modbus TCP. On Allen-Bradley Logix it reads the controller's own tag list automatically; on S7 and Modbus you add the addresses you care about. Build a dashboard and an operator panel with start/stop buttons in about 15 minutes, mount a spare iPad in full-screen panel mode, and the operator has a screen before the first repair quote arrives. Reading is free; writes are a one-time unlock with confirmation and limit checks on every value.
The 15-minute temporary panel
Zero-config tag browser for Logix, drag-and-drop dashboard, operator panel, alarms — no changes to the PLC program.
On a desktop? Scan with your iPhone or iPad to get the free app.For the machine itself: the LineKeeper device — in development — is a self-contained 7″ or 10″ touchscreen built to live on the machine permanently — the same drag-and-drop screens, plus what a phone shouldn't carry:
- Live view of every tag, refreshed twice a second — plus write access with a full audit log
- Operator panel: start/stop, indicators, setpoints — hold-to-run buttons release safely
- Stays useful after the repair: data logging, dashboards, machine diagnostics
Small hardware that helps while the panel is out
- GL.iNet Opal travel router — Wi-Fi into the machine network from a spare switch port, so the phone app can stand in as the screen today.
- Anker USB-C to gigabit Ethernet adapter — wired straight into a spare switch port, the phone sees the controller in seconds; USB-C iPhones and iPads need no drivers.
- VIVO pole-mount VESA arm — puts the temporary screen at eye level on a machine post instead of a chair.
- TICONN IP67 enclosure with clear cover — houses the gateway or Wi-Fi bridge on the machine without bare boards on the rail.
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