I use the MELcloud app only to set the time schedules for heating.  I vaguely remember the installer saying use one or the other, not both.

I have a Mixergy for DHW and that also has an app that calls for heat when it needs it so that's completely outside the Mitsi controls for me.

I think the Melcloud timer disclaimer window says it all.

Despite what would be sensible (one set of schedules configurable by both Melcloud and the in-house controller), it seems Mitsi keep local scheduling and in-app scheduling separate.

@majordennisbloodnok Thank you. I will now stick to scheduling on the Ecodan. I still feel that it is strange that any such settings are not transmitted to MelCloud.

I will be collecting data over the next days because some, but not all, of the "random" running of the ASHP may have originated in MelCloud settings I had forgotten. 

Posted by: @davidalgarve

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I still feel that it is strange that any such settings are not transmitted to MelCloud.

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I couldn't agree more. I might go so far as to change the word "strange" to "inane"; definitely not the way I believe any piece of software functionality should be designed.

A pity, too, since the hardware has, for me at least, been absolutely rock solid. I really hope Mitsi have a project internally for redesigning Melcloud to bring it kicking and screaming into the modern age.

I put the above question to Mitsu UK at the sme time as I did so on the forum, but I didn't expect a reply, because a number of previous messages have gone unanswered. However, I am very grateful to have just received a very useful response which I will share, in case it is of interest to others.

My question was: "Does a “Timer” setting on MelCloud only control the switching of the full heat pump?
If I set any schedule (e.g. DHW on/off) on the FTC6 in the Hydrobox, does that schedule show on MelCloud?"

The answer received: "The Melcloud timer and main controller timer are completely seperate and run off different logic.
For hotwater you cant put a schedule on Melcloud only on the main controller but it will state prohibit on Melcloud when the hotwater is scheduled to be off
The on/off function on Melcloud puts the entire system into standby or turns it back on.
For heating we advise to use only 1 device for the schedule"

As we expected, but disappointing that the two systems are not more closely integrated.

Yes, the 2 are separate. 

To add to the complex design from Mitsubishi: If the heat pump is in "run" mode on the Mitsi controller, it will ignore the schedules that you've programmed on the controller (I think). 

@davidalgarve 

I find scheduling through MELCloud far more easier especially if you want to make alterations for whatever reason.

So frustrating that the only alterations for DHW through MELCloud is the hot water set temperature or to force heat

Members on this very forum have stated DHW can be timed through MELCloud. Not on my system that’s for sure.

@westkent Feel free to take a look at https://www.havenwise.co.uk/ if you feel limited by Melcloud. 

(Disclaimer: I'm the CEO of Havenwise)

For all the Melcloud users out there, have there been no improvements or developments to the app/platform yet?

@editor I have been using it for a heat pump since 2022 and don't recall any significant changes. I also use it for an air conditioning unit and that is much superior in the logic and the options available.

@hcas Could you confirm if the wireless Controller is still an essential part of your controls, please? My contractor's attempt at such an  installation was a dismal failure and I will have to do it myself when other pressures allow.