Hi Thomas
I would like to use your great work to create an integration platform that can be installed via hacs, so that the values are shown in a climate control Lovelace card and so that the settings can also be altered from the HA user interface.
Could you check what registers and values are used when changing mode and fan speed? Also how to get the filter condition? And how the app finds the IP? Are there other info that would be interesting?
Hi Michael,
I will try to find the information you are looking for, but I’m not at home for the next week or so. I think I can get back to you in two weeks time. I need local network access to the Dantherm unit to find the information.
/Thomas
I would love to use your component 
I have created a basic custom component and a card setup using the picture element card. There might be some modbus reading errors that I need to understand. Is it common to have reading errors with modbus via tcp?
When I have the remaining modbus addresses, I will implement the fan & mode control and the filter status.
Please give me input to the layout and features needed on the card?
Hi Michael,
Where do you see the reading errors?
I think the card looks fine, maybe I will come up with some comments when I get more registers from the unit.
I have the “operation mode” to you. You can play with Dantherm app to see how to interpret the value, but it is something like this:
Bit 0-4 Op/mode
2 = Auto
4 = Manuel
8 = Week program
16 = Travel/Vacation
Bit 5 Night mode
0 = off
1 = on
- name: dantherm_op_mode
hub: dantherm_hub
slave: 1
register: 168
count: 2
reverse_order: true
data_type: uint
I’m not sure how to configure writing to the register. Looking in Wireshark the Dantherm app writes the “operation mode” by writing multiple registers in one writing (register 168 and 169). Register 168 is the desired value (like described above) and register 169 is just zero. See if you can get something out of it. Write back to me if you need more info.
I will of cause find you more registers but I would like to hear if you can get this into Home Assistent.
Let me know.
/Thomas
Hi again,
This sent the Dantherm Unit into Manuel mode. Changing the value to [2,0] will send it back into Auto.
Filter periode:
- name: dantherm_filter_period
hub: dantherm_hub
slave: 1
register: 556
count: 2
reverse_order: true
data_type: uint
Filter status:
- name: dantherm_filter_status
hub: dantherm_hub
slave: 1
register: 554
count: 2
reverse_order: true
data_type: uint
/Thomas
Hey Thomas!
Managed to get my HCV 400 P2 working with your previous work. I had to change the syntax according to the Modbus documentation, but might have been me making an error in the original syntax.
For people interested, I’ve made an automation based on a button press from the IKEA Trådfri (IKEA E1812 control via MQTT | zigbee2mqtt.io) allowing the fan to run at 15 minutes, which is useful when showering or using the restroom. The automation also sets the fan back to auto mode, when the time has passed.
- id: '1629060094721'
alias: Short Ventilation
description: Sets ventilation to step 4 for 15 minutes
trigger:
- platform: device
domain: mqtt
type: action
subtype: 'on'
discovery_id: BathroomButton action_on
condition: []
action:
- service: modbus.write_register
data:
hub: dantherm_hub
address: 168
unit: 0
value:
- 4
- 0
- service: modbus.write_register
data:
hub: dantherm_hub
address: 324
unit: 0
value:
- 4
- 0
- delay:
hours: 0
minutes: 15
seconds: 0
milliseconds: 0
- service: modbus.write_register
data:
hub: dantherm_hub
address: 168
unit: 0
value:
- 2
- 0
mode: single
Super. The Modbus syntax was changed if I am not mistaken in HA 2021.7. I actually first got to change my own configuration this weekend. I have a Philips Hue motion sensor laying around, maybe I should try your work letting motion in the bathroom trigger the higher ventilation stage. 
The ventilation is brand new for us, and just learned this morning that it actually increases the ventilation (when on automatic), when we shower, so depending on how fast your humidity sensor reacts, you might not need it for showering - only for certain other bathroom activities, where you’d like the smell to disappear quickly 
Will you post your new config for others that might try replicating it will have the correct one for after 2021.7?
Additionally, are you getting meaningful data from all your temperature sensors? Most are giving me wrong numbers - which version of the ventilation did you have?
Hi Mettchen.
Maybe you mis byte swapping in your configuration?
This is my current configuration:
modbus:
name: dantherm_hub
type: tcp
host: 192.168.0.43
port: 502
sensors:
- name: dantherm_time
scan_interval: 1
slave: 1
address: 108
count: 2
swap: word
data_type: uint
- name: dantherm_fan_state
scan_interval: 10
slave: 1
address: 324
count: 2
swap: word
data_type: uint
- name: dantherm_op_mode
scan_interval: 10
slave: 1
address: 472
count: 2
swap: word
data_type: uint
- name: dantherm_bypass
scan_interval: 10
slave: 1
address: 198
count: 2
swap: word
data_type: uint
- name: dantherm_filter_remain
scan_interval: 10
unit_of_measurement: days
slave: 1
address: 554
count: 2
swap: word
data_type: uint
- name: dantherm_filter_lifetime
scan_interval: 10
unit_of_measurement: days
slave: 1
address: 556
count: 2
swap: word
data_type: uint
- name: dantherm_outdoor_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 132
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_supply_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 134
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_extract_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 136
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_exhaust_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 138
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_humidity
scan_interval: 10
unit_of_measurement: "%"
slave: 1
address: 196
- name: dantherm_fan1_rpm
scan_interval: 10
unit_of_measurement: "rpm"
slave: 1
address: 100
count: 2
swap: word
data_type: float
precision: 0
- name: dantherm_fan2_rpm
scan_interval: 10
unit_of_measurement: "rpm"
slave: 1
address: 102
count: 2
swap: word
data_type: float
precision: 0
sensor:
- platform: template
sensors:
dantherm_op_mode_template:
value_template: >
{% set op_mode = states("sensor.dantherm_op_mode") %}
{% if (op_mode == "0") %}
Standby
{% elif (op_mode == "1") %}
Manuel
{% elif (op_mode == "2") %}
Automatik
{% elif (op_mode == "3") %}
Uge program
{% elif (op_mode == "5") %}
Væk tilstand
{% elif (op_mode == "6") %}
Sommer tilstand
{% elif (op_mode == "14") %}
Afrimning slukket
{% elif (op_mode == "15") %}
Afrimning
{% elif (op_mode == "16") %}
Nattilstand
{% else %}
Ukendt
{% endif %}
dantherm_time_template:
value_template: >
{{ states.sensor.dantherm_time.state | int | timestamp_custom('%d.%m.%Y %H:%M', false)}}
dantherm_bypass_template:
value_template: >
{% set bypass = states("sensor.dantherm_bypass") %}
{% if (bypass == "0") %}
Lukket
{% elif (bypass == "1") %}
Igang
{% elif (bypass == "32") %}
Lukker
{% elif (bypass == "64") %}
Åbner
{% elif (bypass == "255") %}
Åben
{% else %}
Ukendt
{% endif %}
Sorry for the delayed response.
That was exactly it!
Tak!
Hi all,
Playing around with my new Dantherm HCV400 unit. All above works perfectly well, but when I try to change op_mode on address 472, it seems not working. Tried on address 168 as Mettchen mentioned, but this send op_mode (on address 472) into 10 - which is unknown state, and cannot change it back into mode 1 or 2. Right now the unit only work manually with fan speed adjustments.
How to change it back?
My configuration:
modbus:
name: dantherm_hub
type: tcp
host: 192.168.0.236
port: 502
sensors:
- name: dantherm_fan_state
scan_interval: 10
slave: 1
address: 324
count: 2
swap: word
data_type: uint
- name: dantherm_op_mode
scan_interval: 10
slave: 1
address: 472
count: 2
swap: word
data_type: uint
- name: dantherm_bypass
scan_interval: 10
slave: 1
address: 198
count: 2
swap: word
data_type: uint
- name: dantherm_filter_remain
scan_interval: 10
unit_of_measurement: days
slave: 1
address: 554
count: 2
swap: word
data_type: uint
- name: dantherm_filter_lifetime
scan_interval: 10
unit_of_measurement: days
slave: 1
address: 556
count: 2
swap: word
data_type: uint
- name: dantherm_outdoor_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 132
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_supply_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 134
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_extract_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 136
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_exhaust_temperature
scan_interval: 10
unit_of_measurement: °C
slave: 1
address: 138
count: 2
swap: word
data_type: float
precision: 1
- name: dantherm_humidity
scan_interval: 10
unit_of_measurement: “%”
slave: 1
address: 196
- name: dantherm_fan1_rpm
scan_interval: 10
unit_of_measurement: “rpm”
slave: 1
address: 100
count: 2
swap: word
data_type: float
precision: 0
- name: dantherm_fan2_rpm
scan_interval: 10
unit_of_measurement: “rpm”
slave: 1
address: 102
count: 2
swap: word
data_type: float
precision: 0
sensor:
Hi,
It seems your unit is in some “Installer Mode”.
Have you tried changing the state of the unit with Dantherms own app from your phone? Maybe it can bring the unit out of it? Or tell you something else?
Hi,
App is not telling anything, and unit flashing two green leds. Rebooted the unit, and back functioning.
So need to figure out how to write the correct codes to the correct registers on the unit, so shift between “auto”, “manual”, as well as “summer” and “bypass auto” modes.
Also got access to the PC Tool, for further adjustment of set values.
I have coded my own full demand control of HCV400, based on night / outdoor / home signals from IHC, whether the bath is in use (IHC signal), and demand control via indoor climate sensors on VOC and CO2 (Airthings Wave Plus) and RH via the built-in sensor , as well as whether patio doors are open in summer (switch to extraction only).
My system only runs auto at night and when the house is empty. Fan 1 speed only when VOC, CO2 and Humidity are very low, as VOC and CO2 rise too fast when running fan1 at standard. It runs 2 by default, and adjust to 3 respectively 4 depending humidity, CO2 and VOC levels.
Since the last update of HA, the modbus integration now requires the numbers to have specified the number of bits. All are 32 bits.
This is the newest configuration for anyone interested:
modbus:
- name: dantherm_hub
type: tcp
host: 192.168.1.23
port: 502
sensors:
- name: dantherm_op_mode
scan_interval: 5
slave: 1
address: 472
count: 2
swap: word
data_type: uint32
- name: dantherm_bypass
scan_interval: 5
slave: 1
address: 198
count: 2
swap: word
data_type: uint32
- name: dantherm_filter_remain
scan_interval: 5
unit_of_measurement: days
slave: 1
address: 554
count: 2
swap: word
data_type: uint32
- name: dantherm_filter_lifetime
scan_interval: 5
unit_of_measurement: days
slave: 1
address: 556
count: 2
swap: word
data_type: uint32
- name: dantherm_outdoor_temperature
scan_interval: 5
unit_of_measurement: °C
slave: 1
address: 132
count: 2
swap: word
data_type: float32
precision: 1
- name: dantherm_supply_temperature
scan_interval: 5
unit_of_measurement: °C
slave: 1
address: 134
count: 2
swap: word
data_type: float32
precision: 1
- name: dantherm_extract_temperature
scan_interval: 5
unit_of_measurement: °C
slave: 1
address: 136
count: 2
swap: word
data_type: float32
precision: 1
- name: dantherm_exhaust_temperature
scan_interval: 5
unit_of_measurement: °C
slave: 1
address: 138
count: 2
swap: word
data_type: float32
precision: 1
- name: dantherm_humidity
scan_interval: 5
unit_of_measurement: "%"
slave: 1
address: 196
- name: dantherm_fan1_rpm
scan_interval: 5
unit_of_measurement: "rpm"
slave: 1
address: 100
count: 2
swap: word
data_type: float32
precision: 0
- name: dantherm_fan2_rpm
scan_interval: 5
unit_of_measurement: "rpm"
slave: 1
address: 102
count: 2
swap: word
data_type: float64
precision: 0
- name: dantherm_fan_state
scan_interval: 5
slave: 1
address: 324
count: 2
swap: word
data_type: uint32
Hi
I have a HCV 300 Pro.
Where have you found the Modbus documentation? Or can you share what you have 
/Jesper
I mailed Dantherm a while ago to get more info on the modbus configuration. They sent me a full document with all registers. Maybe this can be of some use to you?
I’m hoping for a HACS and maybe a guide to get started gonna try in 1 month when I move
Hi!
Can you explain how you manage to communicate (give instructions to the HCV400)?
Because I would like to do the same as you in terms of control (door open for summer, CO2 level monitored in important rooms).
In terms of power consumption, there is a big difference between levels 2 and 3. I can’t find any automatic programs that correspond to our needs.
Indeed, level 1 is not sufficient at all when the house is not empty.
And I can only use the application locally … At the moment, the VPN on my phone does not allow me to connect to the HCV400 via their application.
Thanks in advance.