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Controlling Daikin Altherma via P1P2 and Home Assistant

 
Air Source Heat Pumps (ASHPs)
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 weoleyric
(@weoleyric)
Trusted Member Member
Joined: 4 years ago
Posts: 16
Topic starter 15/12/2025 9:31 pm  

Are there any fellow Daikin Altherma 3M owners who are using Home Assistant to control their heatpump?

I’ve installed a P1P2MQTT unit connected to HA to give me more control over our Daikin heat pump and to move away from the truly inflexible Daikin Onecta setup.

I’ve tried to set up the Daikin indoor unit so that it doesn’t interfere with HA control but I’m still finding some curious and frustrating results.

For instance, I wanted to set the hot water tank to only heat overnight during our Octopus Go cheap rate tariff, but I’m finding the Daikin hot water seems stubbornly stuck at 50c despite there being no schedule set on the indoor unit, and Eco DHW set to 30c and comfort DHW set to 35c.

if anyone else has tried to use HA to control their Daikin, I’d appreciate any tips for any aspect of the setup.

Our setup is

* Daikin Low Temperature Monobloc 4kW Heat Pump (EDLA04E2V3)
* Daikin Indoor Unit
* Daikin WLAN Adaptor (BRP069A78)
* Daikin 150L Hot Water Tank
* Solar iBoost+



   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1244
15/12/2025 10:05 pm  

I haven’t got a Daikin but I have been having some fun with MQTT on another thread. If anyone else can cover off the normal Daikin control stuff I’m happy to help fill in the MQTT and HA bits.


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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