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Air Source Heat Pumps (ASHPs)
Last Post by Mars 3 months ago
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 170
Topic starter 22/08/2025 9:49 am  

Could someone remind me of any interaction between any "Timer" settings on MelCloud and "Schedule" timer settings on the Ecodan FTC6.

E.G. Do MelCloud timer settings control the full ASHP on/off, or can it control heating and/or DHW?

If I make a setting on one (e.g Ecodan) should it show on the other (e.g. MelCloud)?

My primary scheduling has been done on the FTC6, but with strange events occurring, I am wondering if I should set up MelCloud with the same data 

 


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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downfield
 downfield
(@downfield)
Reputable Member Member
Joined: 1 year ago
Posts: 103
22/08/2025 10:04 am  

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.


Mitsubishi Zubadan 14kW with Mixergy 210l DHW in 220m2 barn property. 24 solar panels = 9kWp with GivEnergy 5.0kW Hybrid inverter and 19kWh GivE batteries. Jaga Strada fan-assisted rads throughout. Landvac vacuum glazing/triple glazed windows.


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1189
22/08/2025 10:15 am  

I think the Melcloud timer disclaimer window says it all.

Melcloud timer disclaimer

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.


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 170
Topic starter 22/08/2025 2:56 pm  

@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. 


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1189
22/08/2025 4:14 pm  

Posted by: @davidalgarve
↑

...

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

...

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.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 170
Topic starter 23/08/2025 8:27 am  

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.


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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1
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 HCas
(@hcas)
Reputable Member Member
Joined: 2 years ago
Posts: 128
27/08/2025 4:40 pm  

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). 


CEO and co-founder at HavenWise


   
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 Westkent
(@westkent)
Estimable Member Member
Joined: 2 years ago
Posts: 61
02/09/2025 9:41 am  

@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.


This post was modified 3 months ago by Westkent

   
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 HCas
(@hcas)
Reputable Member Member
Joined: 2 years ago
Posts: 128
02/09/2025 10:43 am  

@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)


CEO and co-founder at HavenWise


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3784
02/09/2025 1:43 pm  

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


Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 170
Topic starter 02/09/2025 2:07 pm  

@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.


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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 DavidAlgarve
(@davidalgarve)
Honorable Member Member
Joined: 2 years ago
Posts: 170
Topic starter 02/09/2025 2:21 pm  

@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.


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
ReplyQuote



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