Forums

Forums
Renewable Heating
Air Source Heat Pum...
Ecodan heated DHW o...
 
Notifications
Clear all

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!

Ecodan heated DHW outside of timer window, why?

 
Air Source Heat Pumps (ASHPs)
Last Post by TRBob 3 years ago
3 Posts
2 Users
0 Reactions
1,633 Views
RSS
 TRBob
(@trbob)
Trusted Member Member
Joined: 3 years ago
Posts: 56
Topic starter 30/01/2023 11:00 am   [#792]

Yesterday at around 9:45am, the Ecodan sprung into action and heated the DHW tank much to my surprise as I have set the timer on the controller to only heat between 1 and 2pm and if we need more I just do a manual 'Heat Now' via the MEL Cloud app. I definitely did not press 'Heat now' on the app.

Almost 12 months since install and I've never seen it do this.

The only thing of note is that the tank was pretty much cold, we had no major need prior to the 1pm heat up, however I ran the hot tap for quite a while (not too long before 9:45am) to see whether there were any bits of warm water left in there at the top (there wasn't). Could this have made the tank hit a minimum temperature that forces the ASHP to heat the DHW? If so, I don't recall seeing a setting for this in the controller.


Mitsubishi Ecodan 8.5kW
4.4kW Solar PV
5.2 kWh Battery Storage
1983 build, 300mm loft insulation, cavity wall insulation (beads)


   
Quote
 mjr
(@mjr)
Reputable Member Member
Joined: 4 years ago
Posts: 301
30/01/2023 12:43 pm  

The only other scenario I've noticed a DHW heating run happen is when restarting the system after a power cut. I've seen the tank reading get pretty cool and it still wait for the end of a heating-prohibited schedule period.

By the way, if you want a DHW run faster, start it on the controller rather than the app: rightmost screen button then leftmost on mine, then back out to the front screen for it to activate.



   
ReplyQuote
 TRBob
(@trbob)
Trusted Member Member
Joined: 3 years ago
Posts: 56
Topic starter 30/01/2023 1:20 pm  

@mjr Thanks, yes mine has been at 8 degrees C some days and still waits until the end of the prohibited window, so very strange.

TBH when I press DHW 'Heat Now' on the app or the tap on the thermostat, every time it's almost instantaneous, it's the heating where I find there is a ~15 minute lag before the Ecodan fires up/stops when the temperature is altered. My main controller is in the loft, but thank you for letting me know.


Mitsubishi Ecodan 8.5kW
4.4kW Solar PV
5.2 kWh Battery Storage
1983 build, 300mm loft insulation, cavity wall insulation (beads)


   
ReplyQuote



Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Worth Watching

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security PRO
This Site Is Protected By
Shield Security PRO →