Help identifying 5-pin WiFi connector protocol on Eluxe (HTW?) split A/C – ELSD26EC0JR32-INT

Hardware
1

Hi everyone,

I’m trying to integrate my split air conditioner into Home Assistant and I’m stuck at the hardware identification step. I’m hoping someone here has already dealt with this specific unit or its OEM family.

The unit:

  • Brand: Eluxe Clima (I believe it’s part of the HTW Group)

  • Model: ELSD26EC0JR32-INT

  • Type: Split 1x1 ECO

  • The label also mentions “Klimaanlage 1x1 Split” and “ELSD26EC0JR32-INT” with a barcode.

The problem:
On the indoor unit PCB there is a 5-pin female connector (black housing, 5 positions in a single row) that is clearly reserved for an optional WiFi module. I have attached photos of:

  1. The 5-pin connector on the PCB.

  2. A generic WiFi adapter I found on Amazon (CS532AX style) which has a different 4+1 pin layout, so it doesn’t fit.

  3. The terminal block area on the same board for reference.

What I’ve tried / found so far:

  • I searched the Home Assistant Community and Reddit but found almost nothing specific to Eluxe or the ELSD26EC0JR32-INT model.

  • I saw mentions that some HTW models (e.g., IX80) are actually rebranded Gree units and use a Gree WiFi module (CS532AE), but I have no confirmation for my model.

  • I also read that HTW sometimes uses Midea-based protocols, but again, no confirmation for this specific unit.

  • The official HTW USB WiFi module (USBWIFI06) exists, but my unit does not have a USB port, only this 5-pin header.

My questions for the community:

  1. Has anyone here successfully integrated an Eluxe / HTW split with a 5-pin WiFi header into Home Assistant?

  2. Can anyone identify the pinout of this 5-pin connector? (I suspect it’s +12V, GND, +5V enable, TX, RX based on similar Midea/Gree designs, but I don’t want to guess and fry the board.)

  3. Is there a known ESPHome / ESP32 solution for this specific connector, or a proven adapter that goes from this 5-pin header to a standard USB WiFi module?

  4. If you have the same unit, did you manage to get the official WiFi module working, and if so, what is its part number?

Any help, schematics, or even just a “I have the same unit and here’s what I did” would be hugely appreciated. I’m happy to provide more photos or measurements if needed.

Thanks in advance!

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2

Argo Greenstyle Top has same scheme and uses (Tuya) wifi module like this:

image
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Quite likely made by AUX.

Edit. Greenstyle Top has module included, not sold separately. The one on the image is for “non Top” version.

3

I am trying to get info about it from a couple sellers, that is the best option I have at the moment. Thanks

I hope to find a solution because I wold like to avoid the IR remote route if possible as I would not know if the ac is on or not.

4

I think you should open it to see the main board, that would likely give info what you need.