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.
