Something has gone quite wrong with my 8kW Daikin today!

squarepeg77 · 2024-12-09T10:44:53.866Z

Hi @alibloke, I was told the firmware was supposed to improve the responsiveness of the expansion valve. That’s all I know and I can’t say I noticed any before/after changes from my monitoring of it using ESPAltherma.

I think the big improvement for my system was getting the tape heaters disabled. Before, my system would not deliver a reliable delta-T to my house as it was tape heating the water returning to the heat pump!

tiger_cook · 2024-12-11T12:03:44.779Z

Chris_Hill:

This is a long shot , I did see some strange behaviour once , after a change I made to the weather curve
. This continued for a few hours and after that I removed the mmi causing it to shutdown ( pull just at the top ) after the reboot things went back to normal , might be worth a go
Chris

Hi @Chris_Hill you may be onto something, I made a change yesterday morning that caused a reboot – nice steady LWT and constant 500w draw, ~12hrs later back to fluctuating power and LWT, this morning I initiated a short on/off via onecta and its back to a nice steady LWT and constant 500w draw. This could be good evidence for a Daikin support ticket?

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Chris_Hill · 2024-12-11T16:26:27.081Z

the only down side to doing this , is the hot water cycle starts after the restart if your water in tank is cool enough , did you just switch on/off the Central Heating in the app ( does this start the hot water cycle ??

tiger_cook · 2024-12-11T16:39:48.833Z

Yes, I just turned off the space/central heating via the API in HA (same as in the app), no DHW heat, just the mini peak before settling down.

Chris_Hill · 2024-12-11T16:58:10.684Z

makes you wonder if the long runs are over whelming the refrigerant over the long runs

or the inverter is running at such a low frequency (Hz) compressor is struggling and if this is the case the compressor is going to have a very life span, ideally the frequency should be running the compressor between 40-70Hz once you start running outside of this the inverter and compressor will have reduced life

Robert.Wall · 2024-12-12T21:01:26.353Z

12 posts were split to a new topic: ESPAltherma / ESP32 power supply problems

matt-drummer · 2024-12-12T17:34:01.078Z

So, this thread has gone into areas outside my original problem, which is fine, and has been useful.

My original problem has not reared its head for some time with me which is good news.

My heat pump is in a fairly exposed location, against one wall of the house but wide open at the sides and the front.

Now that the wind has died down it is running very steadily.

So maybe air flow (wind in this case) is an issue. It has certainly made the heat pump less efficient by the looks of it as now it is calm it is running really well even though the headline outside temperature is no higher.

I feel that it is all rather sensitive to the weather, wind (turbulance?), wind chill, and higher outdoor temperatures coupled with low flow temperatures.

I feel happier that I have some idea of what is going on and what to treat as normal behaviour.

dmajwool · 2024-12-12T22:23:40.690Z

matt-drummer:

My original problem has not reared its head for some time with me which is good news.

I’m not so fortunate @matt-drummer. Mine has been erroring twice a day like this at 8pm today:

Screenshot 2024-12-12 2215041114×583 87.4 KB

At midnight last night I saw it starting to error and switched off heating using Onecta and immediately re-enabled heating. When the pump started up again, it was not in the error state:

Screenshot 2024-12-12 1040241107×583 88.4 KB

I’ve started a discussion with Octopus aftercare engineers about this and will report back when that conversation concludes.

Cheers, David.

matt-drummer · 2024-12-16T19:11:36.130Z

So, the first time I have seen it on anything other than an 8kW although I’m not sure what this really is as the flow temperature increases, so maybe not the same issue?

This is @Chris_Hill 6kW in space heating and the run came to an end, so either @Chris_Hill shut it down or it did it itself?

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Chris_Hill · 2024-12-17T12:22:38.202Z

what day was this and what are you pacifically looking at

matt-drummer · 2024-12-17T12:26:50.298Z

Hi Chris,

It was yesterday.

It looks odd but maybe not the same issue as I thought me and others have experienced.

Large increase in electricity and not enough heat for the consumption (shown by the plummeting COP)

Chris_Hill · 2024-12-17T12:36:07.518Z

do you think it also happened just after 23:30 also ?

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is you flow rate doing the same ?
i never turned anything off

zoomed in

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matt-drummer · 2024-12-17T12:45:17.929Z

Hi Chris,

Something has made the compressor stop but the heating must still be on as the pump is running (it’s not cold enough to be frost protection)

So, I would assume the heat demand is satisfied?

And the change in flow temperature is requested by the Madoka/MMI?

It doesn’t look like the `fault’ me and others have experienced.

Not very efficient though.

I run fixed lwt, no wdc, no schedules, nothing. I haven’t seen this on mine, but I wouldn’t.

I also don’t recall seeing anything like that before.

I wonder what made the compressor stop?

Chris_Hill · 2024-12-17T12:48:51.890Z

yes the home went particularly warm the target temp is set to 22 but i think i have a maximum internal temp (modoka) of 23 set in the mmi

matt-drummer · 2024-12-17T12:53:54.926Z

The temperature reported in the chart is steady so that must be in another location to the Madoka?

My temperature sensor is in an upstairs bedroom but my downstairs where the Madoka is located is about 2c higher.

The Madoka sets the maximum, if you set 22c it will go to 23.5c and then turn the heating off.

And then not come on again until 21.5c.

Does your house cool that quickly? The heating starts again in 25 minutes.

Mine doesn’t.

You must also have your pump set to run continuously?

Chris_Hill · 2024-12-17T13:00:04.748Z

the temp is the modoka temp , the drop does look a bit dramatic than normal, but it is possible the garage door was open

if the heating stopped the blue led goes off and this can have a effect on the reported temp , i always notice this (crap design )

im not sure what the pump is set to but will take a look

Chris_Hill · 2024-12-17T13:07:38.645Z

IMG_92682016×1512 781 KB

Pump is set to request

Wouldent the pump run on if the heat stopped for a set period ?
sorry for bad pic

Chris_Hill · 2024-12-17T13:13:11.793Z

The room set pump range is 18 to 23

IMG_92711512×2016 834 KB

But the main zone range is 18 to 40 in installer setting

matt-drummer · 2024-12-17T13:13:39.854Z

I don’t know Chris.

The compressor has stopped but the pump is running at 19lpm.

The Madoka has a 2c hysteresis but it only took 25 minutes for the compressor to come back on with no apparent loss in house temperature.

In any case, I saw and just thought it looked quite dramatic. It doesn’t look like a particularly controlled way for it to have decided to stop heating, and it has done the same at 23.30 as you mention.

matt-drummer · 2024-12-17T13:17:59.350Z

I don’t remember what those settings are.

It has been a long time since I have looked.

Are you sure one of those isn’t related to the outside temperature?

I know there is one temperature setting in the MMI that won’t allow the heat pump to space heat once the outside temperature reaches what you have set.