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Numerous issues – 11kW Daikin Altherma 3

newhouse87 · 2023-03-16T04:32:58Z

HI, Just found this forum last night and some of the posters on here have better knowledge then i have found anywhere else. Don't understand alot of it yet but anyway i had 11kw daikin altherma3 low temp split installed last February and moved into the newbuild in June. Only since winter came i have noticed many issues. For past 3 months some rooms were not heating at all but in the last 2 weeks i have figured out stats were wired to wrong ufh loops, have that sorted now thankfully. Installer left me no paperwork and told me nothing about system. Im still thinking its not as efficient as it should be. Some rooms take up to5-7 hours to get up to 21degree setpoint from say19degrees. Only from reading this forum i think my dhw schedule is bit inefficient. DHW 7am 50deg,2pm 50deg, once a week at5am 60deglegionella cycle. All schedules are 2hours long i think. Reheat set point is at 45 so from reading here im thinking that's too high and may override my ufh flow too much. Im on weather dependent mode but yesterday was 11 degrees and my lwt was 32. Is that bit cold and maybe why my ufh slow? Also noticed my copper flow pipe from unit gets hot but i could go back into room 10mins later and its alot cooler, any reason for this? Apologies about all the questions but i had extreme bills in nov/dec and want to figure this out and this forum seems by far the most knowledagble. Using 70kwhs a day on cold days in a well insulated 2600sq ft bungalow seems bit much. Getting some big spikes especially at night time/early morning. Thanks again.

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Air Source Heat Pumps (ASHPs)

Last Post by JanHarley 4 hours ago

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JanHarley

(@janharley)

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Joined: 4 hours ago

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12/11/2026 11:25 am

Daikin Altherma 3 R F+W, room thermostat control, weather-dependent setpoint. Onecta showed Climate control as “INACTIVE” with an exclamation mark and a grey ring, so I couldn’t adjust the setpoint. Room and outdoor temperatures were still updating, and the heating was working normally.

Things that were not the cause: space heating was on at the controller, there were no error codes, and Home Assistant wasn’t interfering.

Fix: On the indoor unit’s controller, go to Main menu → Wireless Gateway → Reboot. Once the gateway had restarted, Onecta showed the normal setpoint ring again.

Looks like the gateway gets stuck reporting status to the cloud while temperature data keeps coming through. Worth trying before calling an installer.

This post was modified 1 hour ago by Mars

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