Troubleshooting
Work through the relevant section below. If the problem persists, gather the appliance serial number and firmware version (testladen-cli status) and contact support.
LED / error code table
When the SYS LED shows red, read the active error with testladen-cli status.
| Code | LED | Meaning | Action |
|---|---|---|---|
| E01 | Blinking red | Power supply fault | Check mains and fuse; power-cycle. If it recurs, contact support. |
| E02 | Blinking red | Over-temperature | Check ventilation clearance and dust filter; let the unit cool, then restart. |
| E10 | Red | Module initialisation failure | Reseat the module; confirm backplane compatibility (Module overview). |
| E11 | Red | Module hardware error | Move the module to another slot; if it still fails, RMA the module. |
| E20 | Amber | Network link down | Check the MGMT cable and switch port; verify LINK LED. |
| E21 | Amber | No DHCP address | Assign a static address over the USB-C console. |
| E30 | Red | Controller/module firmware mismatch | Update to a matching release (Firmware & software). |
| E40 | Red | Configuration corrupt | Restore a backup, or perform a factory reset. |
Common connectivity issues
discover finds nothing / testladen.local won't resolve. mDNS may be blocked on your network or across VLANs.
- Confirm the MGMT LINK LED is lit.
- Ensure your workstation is on the same subnet/VLAN as the appliance.
- Address the appliance by IP address instead: find the lease on your DHCP server, or read the current IP from the USB-C console.
- Some corporate networks filter multicast — ask IT to permit mDNS (UDP 5353) or assign a static IP.
Appliance has no IP address (E21). Connect the USB-C CONSOLE cable, open a terminal at 115200 8N1, and set a static address:
testladen-cli config set network.mode static
testladen-cli config set network.address 192.0.2.42/24
testladen-cli config set network.gateway 192.0.2.1
API returns 401 Unauthorized. An access token is configured — pass it with --token / TESTLADEN_TOKEN (CLI) or the Authorization: Bearer header (JSON-RPC).
Factory reset
A factory reset clears the configuration (network, tokens, rail definitions and presets) and returns the appliance to DHCP + mDNS defaults. It does not change firmware.
From the CLI:
testladen-cli --host testladen.local reset --factory
From the appliance: with the unit powered, press and hold the recessed RESET button on the front panel for 10 seconds until the SYS LED blinks amber, then release. The appliance reboots to defaults.
⚡ Back up your configuration first — a factory reset cannot be undone.
Contacting support
If the issue is not resolved:
- Email contact@bitcrushtesting.com or use the contact form.
- Include the serial number, firmware version, the error code, and the output of
testladen-cli status --json. - For hardware faults under warranty, see the RMA process.