How to reduce frequency of defrosts on Daikin Altherma?

It is possible to turn DHW on and off with the Onecta API, for which I believe there is a HA integration. I do this with my own integration, and usually want to have “one shot” operation where the HP should stop heating the DHW once it is up to temperature (most days I do not reheat).
If your Python is any good, it isn’t too hard to DIY, but the authentication process requires some careful working through.
The Daikin documentation of the Onecta API is not too bad, but I think you do need to create a developer account to access it.

yes you turn it on and off using the power mode using the onecta app

Yes, that entity is from the Daikin API in home assistant

I have some notes and python code at
GitHub - divenal/python-onecta: python class to connect to Daikin Onecta cloud interface
if it’s of interest to anyone.

Dave -
I use https://redirectmeto.com/ to handle the redirects
It will work with a “private” IP address on your LAN.

1 Like

A post was split to a new topic: NIBE F2040 12kW is short cycling

I don’t mean to hijack this thread, and I’ll make a new post if required, but I’ve followed to try and reduce the number of defrosts on my unit, and also increase efficiency.

I’ve been successful with both thankfully but my heat pump now seems to be cycling because the flow rate isn’t reducing?

is this a 9 kw + heat pump , and do you have internal temperature control active or on pure weather comp ,

1 Like

Yes it’s a 9kw.

Temp control at 21c but highest it’s been is 21.2c so thermostat isn’t turning it off.

DeltaT is high at 8 or 10, can’t remember exactly. Modulation at 5. Pump speed 60%. Quiet mode.

hi @Chris_Hill is this the setting, and did it work?