Nilan
Nilan CTS400 / ES1077 (Comfort 250 Top)
Thermostats · Climate
Partly worksLocal
2 reports: 1 says it partly works, 1 asks for support.
Reported with 2 integrations: Genvex Connect, Nilan.
What people report
| Integration | In Home Assistant | In Apple Home | What they said | Source |
|---|---|---|---|---|
| Genvex Connect | Partly works Local | Sensor addresses reportedly differ from other Nilan libraries; values mismatch appSaved copyIt seems like the addresses in the GenvexNabtoCTS400 for the sensors does not match the addresses in the other Nilan libraries. From what i can find, ex. https://github.com/nic6911/ESP32_Modbus_Module/blob/main/esphome_example_code/Nilan_cts400.yaml has the addresses that matches my test results (image placed last in this comment) Excerpt saved from GitHub on 2026-10-23. | Issue #7 · 2024-08 | |
| Nilan | Requested Local | Different register map; support PR openSaved copyWhy Adds support for the Nilan CTS400 / ES1077 controller (Comfort 250 Top) alongside the existing CTS602 integration. The CTS400 uses a different Modbus register space, cannot be auto-detected (it has no CTS602 `control_type` register at holding 1000), and only supports function codes FC03/FC04/FC06. It therefore can't be added as a small CTS602 "device key" and is wired as a distinct board family. This is ready for review, opened from a fork, and refs discussion #165. It is additive only - no CTS602 behavior changes. ## Provenance and verification - Verified live on a Nilan Comfort 250 Top … Excerpt saved from GitHub on 2026-10-23. | PR #223 · 2026-06 |
Each row is one report from a GitHub thread, an integration’s docs, or r/homeassistant. Check the date and the linked source before you buy.
In ReReHome
Once Home Assistant’s HomeKit Bridge shares it, this device reaches Apple Home as a HomeKit accessory behind your Home Assistant bridge, so ReReHome shows and controls it like any other.
Identifiers
| Brand | Nilan |
|---|---|
| Model | CTS400 |
| Category | Thermostats |
Also reported as
- Nilan CTS400 ventilation unit
