Daikin Altherma - Unable to schedule DWH above 50c

[tubblog]

I've got my P1P2 unit connected to a Daikin Altherma 3M ASHP, and can see all the data OK. Control is turned on.

I've removed any conflicting Daikin Indoor unit settings, so, in theory, Home Assistant shouldn't conflict with Daikin settings.

I'm trying to program my DHW to heat only overnight, during my Octopus Energy Go cheap rate tariff - 0030 to 0530.

But despite the automation below, the Daikin stubbornly refuses to do anything but heat to 50c whenever it chooses.

The Indoor unit is set to 35c Comfort and 30c Eco for DHW.

Can anybody suggest where I might be going wrong?

alias: Daikin DHW - Start Off Peak Heating (50C)
mode: single
triggers:

at: "00:30:00"
trigger: time
conditions:
condition: time
weekday:
mon
tue
wed
thu
fri
sat
actions:
target:
entity_id: climate.bridge0_dhw_dhw_setpoint
data:
hvac_mode: heat
action: climate.set_hvac_mode
delay: "00:00:02"
target:
entity_id: climate.bridge0_dhw_dhw_setpoint
data:
temperature: 52
action: climate.set_temperature
data:
name: Daikin DHW
message: "Off-peak start: DHW ON, target 52°C"
entity_id: climate.bridge0_dhw_dhw_setpoint
action: logbook.log

[dergreg]

Does it happen repeatedly or occasionally? I noticed that calling climate.set_temperature for dhw_setpoint is not accepted every time. You can see this even in the UI occasionally when the slider jumps back to the previous value.

My solution/workaround was to call climate.set_temperature TWICE with a short delay.

[Arnold-n]

I noticed that sometimes, not sure why, HA doesn't trigger a command to be sent when you change the temperature - you can monitor on P1P2/W/# whether the command is actually sent to the bridge. If a command was sent, it may be ignored if the write budget is exhausted. Otherwise it should be executed normally.

[dergreg]

The same happens for me within the Onecta app, which is not related to HA. It seems that the altherma itself rejects some temperature changes for the first time, for whatever reason...

[tubblog]

@dergreg Repeatedly. It's like the Daikin heat snaps back to 50c each time.

Thanks! I'll try calling climate.set_temperature twice and see how it goes.

If that fails, my next step is to change tactic and try amending the eco and comfort values to affect the schedule.

[Arnold-n]

Do you have a schedule active? Manual control and schedules don't go well together.