# Firmware Lifecycle

# Requirements


Before OTA make sure to go through the list below:

  • It is recommended to update the device in the IDLE mode without receiving and executing any commands from Modbus, Enapter Cloud, Enapter Mobile App, EL 2.1 Web GUI or others.
  • In case firmware is updated from 1.5.0 directly to 1.10.0, produced H2 metric will be lost and FP_02 will be raised. It is recommended to follow the upgrade path: 1.5.0 -> 1.6.0 -> 1.7.X -> 1.8.X -> 1.9.X. -> 1.10.X
  • Make sure you have physical access to the device before starting the update process.
  • Do not power off the device during the firmware update.
  • Remove Dryer Control Network before updating the firmware.
  • If Site has Enapter Gateway it needs to be updated to version 1.8.9 or higher.
  • Dryer connected to DCN/IDCN should be version 3.6.0 or higher, otherwise it won't be possible to connect Electrolysers to IDCN, monitor and control Dryer from Electrolyser Web GUI or Modbus TCP interface.

# Change Log

# New Features

  • Added mDNS autodiscovery support.
  • WX_51 disabled on old Control Board EL 2.0 R1.0 (0xE210).
  • Fatal error FX_01 is replaced with error EX_01.
  • Fatal error FO_30 description improved.
  • Added Stop preheat command
  • Dryer Stop and Restart pressure can be set using Web GUI when DCN/IDCN is enabled.
  • Improved Web GUI for DCN and Quick Start Guide.
  • Enapter WT 2.1 support in DCN/IDCN.
  • Enapter WT 2.1 status in Web GUI.
  • Improved PID regulation of electrolyte cooling fan to avoid overcooling and prevention to reach 55C.
  • New FX_12 fatal error is introduced in case of very high voltage on outlet pressure transmitter.
  • Automatic restart of hydrogen production when WU_10 warning resolved during Stand-By state.
  • New FP_06 fatal error introduced to inform about insufficient hardware resources such as memory during operation of DCN/IDCN.
  • Improved OTA backward compatibility.

# Compatibility Matrix

Please carefully check the compatibility matrix for the 1.10.0 firmware version with the previous version.


  • C - fully compatible;
  • NC - not compatible;
  • PC - party compatible, check additional notes.
OTA Upgradable C
Modbus Communication Backward Compatibility C
Configuration C
Rollback C

# Functional Depreciation Statements

  • Warning WS_20 is deprecated. Instead of using it for checking that Electrolyser reached Max Pressure it is recommended to use input register #1200 (4 = Stand-By (Max Pressure)).

  • In case firmware is updated from 1.5.0 directly to 1.9.0 produced H2 will be lost and FP_02 will be raised.

# Modbus Compatibility

  • Holding register #6018 is used for Start and Stop the Dryer starting from firmware 1.6.0.

  • Input registers #14 (Cabinet (Chassis) Serial Number) and #1000 (Stack Serial Number) are deprecated. Instead use holding registers #4026 (Enapter Chassis Serial Number) and #4376 (Enapter Stack Serial Number).

  • Begin with Dryer firmware version 3.6.0 Dryer input registers are deprecated, holding registers should be used instead.

# Known Bugs List

The list below contains the most important problems in the firmware and their solutions.

  • An issue (opens new window) using WiFi and Windows to access the .local hostname.

    Solution: Use a local ethernet connection to the electrolyser or IP address as a hostname.

  • DCN may assign an IP address to devices (computers, mobiles) connected to Wi-Fi AP associated with DCN enabled Enapter devices.


    • Delete the DCN from the Enapter Mobile App and create it one more time.
    • If it is possible try to separate the DCN from your main network environment by connecting the DCN to another WiFi AP. No need to separate one DCN from another.
  • Electrolyser doesn't stop during Ramp-Up if no more electrolyte left in the tank. The system must reach Steady to start Ramp-Down procedure. This might cause fatal error in case system stays in Ramp-Up and have no water supply because it will not stop production of hydrogen in 80 min timeout and will continue to work even the electrolyte will reach very low level.

    Solution: Update the firmware to version 1.10.1 or above.

  • Pump doesn't run when system HALT while Antifrost routine is heating water in the tank.

    Solution: Update the firmware to version 1.10.1 or above.