Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Melpump Users Anywhere?
Posted by: @f1p...
I don't think either will take precedence, it is last received.
...
Thanks, @f1p. My issue with understanding is a matter of what's being changed and how - something I don't know, so in need of illumination.
It seems to me a matter of whether we're talking about an event or a state, and forgive me if I oversimplify my explanation for the benefit of non-coders who may also be reading.
If there's a schedule to trigger an event - like "start heating the hot water" - then understandably that action will start when the trigger is hit either by the local schedule or the Internet one, whichever happens first if both want to try controlling it. If that schedule is only an Internet one and the trigger can't be sent to the heat pump for some reason (e.g. Internet connectivity issues), the heat pump won't do anything when it and the Internet can see each other again. However, if that event puts the heat pump in a particular state (e.g. holiday mode), when the heat pump can talk with Melpump/Melcloud again the two will synchronise that state in one way or another so that either Melpump/Melcloud recognises the pump should be in holiday mode and updates the state retrospectively or the heat pump knows it's not in holiday mode and tells Melpump/Melcloud to sort itself out to reflect this.
For various schedules, I simply don't know if it's events or states that matter (probably sometimes both) and, if it's a state needing to be synchronised how the precedence will work.
Of course, I may be overcomplicating things here. It wouldn't be the first time.
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"
Posted by: @majordennisbloodnokwhen the heat pump can talk with Melpump/Melcloud again the two will synchronise that state in one way or another so that either Melpump/Melcloud recognises the pump should be in holiday mode and updates the state retrospectively or the heat pump knows it's not in holiday mode and tells Melpump/Melcloud to sort itself out to reflect this.
Okay, thanks for explaining - it would be the former. The heat pump current state is always reported actual, regardless of attempts to change it.
- Both in my adapter and the official MELCloud adapter there is retry logic, to compensate for potential write failures caused by a rejection in the FTC as it could reject the command when "busy" or a malformed packed in the serial communication (due to electrical interference for example) and it is limited to a fairly conservative quantity.
- MELPump and Home Assistant both work in a optimistic approach, where the change is considered successful until proven otherwise (confirmed by the next read)
- I don't have evidence to suggest that MELCloud has any retry logic if the command was unable to reach the heat pump due to a connectivity issue
- MELPump has retry logic, where if that optimistic state was proven unsuccessful shortly after it will perform another attempt
Anyone else having issues getting Melpump to display their 'interactive' charts via the Share as URL option?
I'm just getting a blank page, other than for the summary coloured sections at the bottom. I was hoping to use one in a forum reply, but it would be of no use currently.
130m2 4 bed detached house in West Yorkshire
10kW Mitsubishi Ecodan R290 Heat Pump - Installed June 2025
6.3kWp PV, 5kW Sunsynk Inverter, 3 x 5.3kWh Sunsynk Batteries
MyEnergi Zappi Charger for 1 EV (Ioniq5) and 1 PHEV (Outlander)
User of Havenwise (Full control Jun-Dec 2025, DHW only from early Dec)
Subscriber to MelPump App data via CN105 Dongle Kit
- 26 Forums
- 2,725 Topics
- 63.8 K Posts
- 1,065 Online
- 7,126 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Jokes and fun posts about heat pumps and renewables
@transparent I’ve heard that that is why American cars ...
By Toodles , 3 hours ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Have either quote provided room by room heat loss calcu...
By Old_Scientist , 17 hours ago
-
RE: Heat Pump Servicing & Maintenance – Good Value or Rip-Off?
@old_scientist if you are going DIY then you may wan...
By Papahuhu , 2 days ago
-
RE: Indevolt Batteries UK Support & Info Thread
After a short while that was followed by the 'power war...
By JamesPa , 2 days ago
-
RE: Samsung heat pump - data cable issue
That's well done. Cable is the correct type (LIYCY = 2x...
By bobflux , 2 days ago
-
RE: Electricity price predictions
I agree, we will find out at the next budget whether th...
By Old_Scientist , 3 days ago
-
RE: Missing flow temperature in Heat Geek proposal
@editor I went through HG website, so should be ok for ...
By sttpd1917 , 3 days ago
-
Who did the Freedom Heat Pump cloud server and what did...
By Mars , 3 days ago
-
RE: Who's your electricity provider and what's your tariff?
Reading between the lines of what octopus are doing wit...
By JamesPa , 3 days ago
-
RE: Air to air bus grant installer anywhere
The through wall two hole ones have their place (listed...
By EtchedPixels , 3 days ago
-
I hope it goes ok, Hon can be hard to set up IF the sof...
By Graham Hendra , 3 days ago
-
@clockworks Hi, So there is a big difference between st...
By ASHP-BOBBA , 3 days ago
-
@editor wellvery comprehensive answer. I will get all i...
By Keithb , 3 days ago
-
RE: Advice on my Heat Pump Journey: Old Stone Built Detached Cottage
all good advice I will follow this up
By PaulC , 3 days ago
-
Heat of vaporization of water is 2.25 MJ/kg (0.625 kWh/...
By bobflux , 4 days ago






