Case study

Fisher & Paykel RF505BRNUX1: decoding refrigerator board traffic

The Fisher & Paykel RF505BRNUX1 bridge decodes two 9600-baud serial links on the refrigerator's main board and exposes door, setting, compressor, defrost, and temperature states to Home Assistant. Its documentation specifies frame layout, CRC-16/MODBUS, addresses, and byte maps; an ESPHome configuration reads the links without transmitting.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 0
Last commit: 2026-11-01
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: A Fisher & Paykel RF505BRNUX1 refrigerator and Seeed XIAO ESP32-C3 are needed for the documented setup.
Prerequisites: The ESPHome configuration targets version 2026.10 and requires Wi-Fi secrets and an isolated 5 V supply.
Limits: Other F&P or Haier boards may differ; the author advises checking their byte map with a logic analyser.
License: MIT.

Cite

BibTeX

@misc{fisher-paykel-fridge-bus-case,
  title = {{Fisher \& Paykel RF505BRNUX1: decoding refrigerator board traffic}},
  howpublished = {\url{https://github.com/nickthelomas/esphome-fisher-paykel-fridge}},
  url = {https://github.com/nickthelomas/esphome-fisher-paykel-fridge},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/fisher-paykel-fridge-bus-case/}}
}

Plain text

Fisher & Paykel RF505BRNUX1: decoding refrigerator board traffic. https://github.com/nickthelomas/esphome-fisher-paykel-fridge (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/fisher-paykel-fridge-bus-case/

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Primary sources

README.md GitHub · nickthelomas/esphome-fisher-paykel-fridge · Revision 0bd8abc