# Hisense/Hitachi H-NET-Protocol: investigating heat-pump bus signaling

> Hisense/Hitachi H-NET-Protocol investigates the H-NET bus used by Hi-Therma and Air H₂O 400 heat pumps. Its documentation maps controller connections on an AHZ-080HCDS1 unit and describes the two-wire HBS signaling, frame fields and checksums.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-07
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/alex89rm/Hisense-H-NET-Protocol>
- Primary source: <https://github.com/alex89rm/Hisense-H-NET-Protocol/blob/8def3abd2c11df3e010b66409a80b9578abde891/README.md>
- Catalog page: <https://awesomerea.org/resources/hisense-h-net-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/hisense-h-net-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/hisense-h-net-protocol-case/index.md)

## Requirements & limits

- **Scope:** The documented test unit is a Hisense AHZ-080HCDS1 heat pump.
- **Limits:** The custom Home Assistant component is planned.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/alex89rm/Hisense-H-NET-Protocol/blob/8def3abd2c11df3e010b66409a80b9578abde891/README.md>
2. <https://github.com/alex89rm/Hisense-H-NET-Protocol/blob/8def3abd2c11df3e010b66409a80b9578abde891/docs/H-NET_PROTOCOL.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.