ESPHome Ecodan heatpump

It was based on https://github.com/rbroker/ecodan-ha-local. I've also managed to reverse engineer quite some additional properties and controls.

• 0x03 : error codes
• 0x05 : heat source
• 0x0B : refrigerant liquid temperature
• 0x10 : In1, In5, In6 thermostat status
• 0x14 : booster / immersion heater states
• 0x15 : pump status
• 0x28 : forced dhw status
• 0x35 : room temp setpoint (signed) with flags
• 0xC9 : configuration command. It reports back controller version and much more, need more investigation.

available languages

English (default), Dutch, Italian, French. Select the language in ecodan-esphome.yaml file. If you want to contribute with a translation: copy the file ecodan-labels-en.yaml to ecodan-labels-xx.yaml, fill in all the labels and submit a pull request.

proxy mode: run melcloud wifi / procon as slave

It's possible to run a melcloud wifi adapter or procon as slave. The slave unit will function as usual. see proxy.md for more information

server control + prohibit dhw/heating/cooling enabled by default

In sever control mode, the prohibit flags can be set. You can disable it by commenting the sever-control.yaml entry in the ecodan-esphome.yaml.

recommended hardware

If you don't want to solder, use one of the tested boards. More boards that should be working. It also should work for airco units with cn105 connectors.

Tested boards

Board	Link	Notes
Heishamon V5 large	https://www.tindie.com/products/thehognl/heishamon-communication-pcb/	see proxy.md
M5Stack Atom Lite (ESP32 variants)	https://docs.m5stack.com/en/core/ATOM%20Lite	Grove ports used
M5Stack Atom Lite (ESP32 variants)	https://docs.m5stack.com/en/core/ATOM%20Lite	Pins used example
M5Stack Atom Lite S3 (ESP32-S3 variants)	https://docs.m5stack.com/en/core/AtomS3%20Lite	Grove ports used

Cable

• Get one of the grove female cable and a ST PAP-05V-S connector. Remove one end of the grove connector and replace it with a ST PAP-05V-S connector. Here's an example:

Pin mapping (from left to right)

grove	cn105
pin 1 - black (gnd)	pin 4 - black (gnd)
pin 2 - red (5v)	pin 3 - red (5v)
pin 3 - white (GPIO 2)	pin 2 - white (Tx)
pin 4 - yellow (GPIO 1)	pin 1 - yellow (Rx)

Note: pin 5 (12v) on the cn105 is not used.

where to buy

atom s3 lite https://www.digikey.nl/en/products/detail/m5stack-technology-co-ltd/C124/18070571

grove cable (multiple options/lengths available) https://www.digikey.nl/en/products/detail/seeed-technology-co-ltd/110990036/5482563

JST PAP-05V-S connector https://www.digikey.nl/en/products/detail/jst-sales-america-inc/PAP-05V-S/759977

build esphome-ecodan-hp firmware

Build via cmd line:

• Install ESPHome https://esphome.io/guides/getting_started_command_line.html

  python3 -m venv venv
  source venv/bin/activate
  pip3 install wheel
  pip3 install esphome

• Fill in secrets.yaml and copy the ecodan-esphome.yaml to your esphome folder and edit the values (check GPO pins (uart: section), you might need to swap the pins in the config) The secrets.yaml should at least contain the following entries:

wifi_ssid: "wifi network id"
wifi_password: "wifi password"

• Edit the following section in ecodan-esphome.yaml to match your configuration (esp board, zone1/zone2, language, server control, enable debug). Default is an esp32-s3 board, 1 zone and english language.

packages:
  remote_package:
    url: https://github.com/gekkekoe/esphome-ecodan-hp/
    ref: main
    refresh: always
    files: [ 
            confs/esp32s3.yaml, # confs/esp32.yaml, for regular board
            confs/zone1.yaml,
            ## enable if you want to use zone 2
            #confs/zone2.yaml,
            ## enable label language file
            confs/ecodan-labels-en.yaml,
            #confs/ecodan-labels-nl.yaml,
            #confs/ecodan-labels-it.yaml,
            #confs/ecodan-labels-fr.yaml,
            confs/server-control.yaml,
            #confs/debug.yaml,
           ]

• Build

esphome compile ecodan-esphome.yaml

• To find the tty* where the esp32 is connected at, use sudo dmesg | grep tty. On my machine it was ttyACM0 for usb-c, and ttyUSB0 for usb-a.
• Connect your esp32 via usb and flash

esphome upload --device=/dev/ttyACM0 ecodan-esphome.yaml

• You can update the firmware via de web interface of the esp after the initial flash, or use the following command to flash over the network

esphome upload --device ip_address ecodan-esphome.yaml

Here's how it's connected inside the heatpump:

The esphome component will be auto detected in Home Assistant: