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Flexit Modbus register maps

Updated 24 October 2026

1 Flexit model, 59 registers in all, each re-typed from Flexit’s own free documentation and checked against it.

• Air handler

  Flexit Nordic residential air handling unit (Flexit GO, built-in Modbus)

  Flexit NORDIC series residential ventilation units with Flexit GO control and built-in Modbus RTU (cable harness 116405), per the 'Modbus Nordic Basic' register sheet and instruction 117989-01 (2020-01). Not EcoNordic, which has its own register sheet.

  59 registers · 14 writable · RTU
  Also known as: Nordic S2, Nordic S3, Nordic S4, Nordic CL2, Nordic CL3, Nordic CL4, Flexit GO, Modbus Nordic Basic, 117989

Flexit: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).