I had a daikin heatpump installed by Octopus in December (last month). It’s been OK, until the cold snap of the last few days, when it’s struggled to get the temperature up above about 18C (set to 21 on madoka thermostat).
I read lots of discussion, mostly on here, and manuals, and checked my original design documentation from octopus.
That said I should have a leaving water temp of 50C at outside temp of -1.7C.
I checked the WD curve on the daikin MMI, and found the lower point was 50C at -7C. So I adjusted it up to 0C.
This was about an hour ago, and since then, my heatpump has not seemed to draw any significant power (from looking at smart meter IHD), and the house is slowly getting colder!
Does anyone have any idea how to get it running again?
Many thanks,
Ian.
EDIT: Have subsequently revised WD point to -2, just in case it had to be negative, and then back to -7, where it was originally. In each case, the MMI showed ‘Unit will now restart’, then ‘synchronising indoor unit’ then ‘synchronising thermostat’.
I’ve also checked all the circuit breakers, which are OK.
The app shows ‘User interface firmware update available’, which it’s done since install, I’d held off updating it in case it broke something! Any mileage in updating that?
One problem might be not that the water temperature is too low, but that it is having to defrost regularly, and that has quite a large impact on its ability to deliver heat to the house.
On the MMI, have you looked at the information section? That has various interesting views like ‘actuators’ (shows whether pump and/or compressor are running), ‘operation modes’ (which shows when it is defrosting), and ‘sensors’ which shows various internal temperatures, and the pump circulation rate.
Changing the weather curve is a sort of permanent change - you can also experiment with changes using the ‘main zone’ - that shows a guage showing the current temperature, and you can use the adjust dial to move the outside indicator, which is what you want it to be. The display will then show +/- 1,2 … to show the offset you have set. (And this doesn’t require a restart.)
If you have a look at the various information sections, maybe it will be able to tell you what went wrong ?
Did you try check the room temperature setting ? One feature of the madoka thermostat is that once it turns off, it allows the room to fall quite a long way before turning back on. (But because you had said that it was too cold before you touched anything, it’s probably not that.)
I’ve just been on the phone with an Octopus engineer. Main finding was that flow rate is 0, which ties in with it not drawing any power! He couldn’t figure out what was wrong, so I should have someone coming round tomorrow morning.
To be fair, I didn’t tell him that I’d gone into installer mode, but assumed that was the only way to change the WD curve, so he should have known. I may be wrong about needing installer mode to change the curve, haven’t checked if you can do it in ‘advanced user’…
I suppose I should have tried going back to user, just to put it back exactly how it was, but it never crossed my mind that it would stop it working!
Pretty sure mine does… though I’ve noticed a correlation between the API returning errors when in installer mode, and I think the madoka displays something when in installer mode, and won’t allow you to change things.
Went into installer mode to check modulation settings.
Changed the WD curve, came out, saw it synchronise, went back to Advanced user mode, but once again, no heat, no power being drawn.
I’ve pinged back and forth between the modes (installer, use, advanced user) a few times, and also tweaked the curve a few more times, just in the hope that something will trigger it, but no luck.
Any more bright ideas? I have a call in with Octopus, but they didn’t help last time.
One thing I notice is that though the Madoka says 18 degrees, and the MMI says the same, the app reports 32 degrees! I also saw it saying 40 earlier (after I’d started changing things).
It feels a bit like after its been ‘disturbed’, it needs to ‘reset’, various things will reset it, but it’s hit and miss whether it works on any given attempt.
EDIT:
App now reporting 18 degrees, I guess it just needs a bit more time to sync up.
go back in to user mode ,
i have had this a few times when the mmi did not talk to the modoka very well , i solved it by pulling the top right hand corner of the mmi to disconnect the mmi , then waited a good minute and pushed it back on , after i had done this a made sure it was solid on the connections and never had a issue again
