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Troubleshooting

Common issues and solutions for ISOBUS Block

Troubleshooting

Common issues and solutions for the ISOBUS Block module.

WiFi Issues

Can't find the WiFi network

  • Wait 10-15 seconds after power-on for WiFi to start
  • Move closer to the device (within 10-15 meters)
  • Check power - verify the device has proper voltage (7-36V)
  • Look for the right name - network is "Block_relay_XXX"

Connected but can't access web page

  • Go to http://192.168.4.1 (not https)
  • Disable mobile data on your phone - it may route traffic elsewhere
  • Clear browser cache and try again
  • Try a different browser

WiFi password not working

ISOBUS/VT Issues

ISOBUS Block not appearing on VT

  • Check CAN bus wiring (CAN_H, CAN_L, GND)
  • Verify ISOBUS connector is properly seated
  • Wait 30 seconds for VT client to connect
  • Check for CAN termination - the module has an optional 120Ω terminator (jumper)

VT shows "Disconnected"

  • CAN bus may be disconnected
  • Check all CAN wiring connections
  • Verify tractor ISOBUS is active

Output status not updating on VT

  • This indicates communication is working, display may be slow
  • Updates occur approximately 10 times per second

Output Issues

Button on VT does nothing

  • Open EDIT mode on the VT and confirm the button has a channel (CH1-CH8) selected
  • Verify you're not in Test mode in the web interface (which overrides normal operation)
  • Check the ISOBUS Block still shows as connected on the VT

Relay not clicking

  • Open EDIT mode on the VT and confirm the button you pressed switches this channel
  • Verify you're not in Test mode (which overrides normal operation)
  • Check relay load - minimum switching current may be required for some loads
  • Use the web interface TEST function to switch the channel directly and isolate the issue

Relay clicking but load not working

  • Check load wiring to relay terminals (COM, NO, NC)
  • Verify load is within relay ratings (10A max)
  • Test with a simple load (light bulb) to verify relay operation

All outputs suddenly turn off

  • This is the safety timeout - ISOBUS connection may have been lost
  • Check CAN bus connection
  • Outputs turn OFF if no valid command received for 500ms (safety feature)

Firmware Update Issues

"Invalid OTA key" error

  • Check the key on VT Info screen
  • Key is 4 characters, case-insensitive
  • Make sure you're reading from the correct device

Update stuck or failed

  • Don't close browser during upload
  • Stay connected to device WiFi
  • Power cycle and try again
  • Check that firmware file is valid .bin format

Device not responding after update

  • Wait 30 seconds for restart
  • Reconnect to WiFi
  • Try rollback via web interface
  • If unresponsive, wait 3 boot attempts for automatic rollback

General Issues

Device not powering on

  • Verify supply voltage is 7-36V DC
  • Check polarity (BAT+ and BAT-)
  • Check for blown fuse in power supply

Relays stuck on

  • Exit Test mode in web interface
  • Power cycle the device
  • Check for short circuits in load wiring

Erratic behavior

  • Check for electrical noise on power supply
  • Verify proper grounding
  • Add filtering capacitors if on noisy vehicle electrical system

Getting Help

If these steps don't resolve your issue:

  1. Note the firmware version (Settings page)
  2. Note the device ID (WiFi network name)
  3. Describe the exact symptoms
  4. Contact support with this information

For general ISOBUS CAN bus faults, wiring diagnostics, and fault code interpretation, see the ISOBUS Troubleshooting Guide. Quick answers on common setup and output questions are on the FAQ page.