Ecodan heated DHW outside of timer window, why?
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 8.5kWh
4.4kW Solar PV
5.2 kWh Battery Storage
1983 build, 300mm loft insulation, cavity wall insulation (beads)
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.
@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 8.5kWh
4.4kW Solar PV
5.2 kWh Battery Storage
1983 build, 300mm loft insulation, cavity wall insulation (beads)
- 26 Forums
- 2,118 Topics
- 46.6 K Posts
- 123 Online
- 4,523 Members
Latest Posts
-
RE: Double or Triple Glazed Windows?
@toodles Glad to hear things are progressing well for y...
By TRBob , 19 minutes ago
-
I may need to adopt this technique lol!
By Grantmethestrength , 1 hour ago
-
RE: 300 Liter Tank - Do I have to heat it all?
I agree with @morgan. You can turn down the target t...
By JamesPa , 2 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
Then that is what you should demand. As I say above Im...
By JamesPa , 3 hours ago
-
How to waste energy (and time) playing with AI.
A friend of mine who subscribes to an AI service was ex...
By Toodles , 17 hours ago
-
-
RE: Heat Pump Books For Beginners – Bodge Buster & From Zero To Heat Pump Hero
@topher you’re more than welcome to, yes. I’ll send you...
By Mars , 2 days ago
-
RE: Fitting new shower valve ..........
I’ve never taken a chance when fiddling and changing ou...
By Mars , 2 days ago
-
You should contact the council and report the unsatisfa...
By JamesPa , 2 days ago
-
RE: Benefits of an extra horizontal loop for GSHP
I would deffo install an additional slinky run, especia...
By Transparent , 2 days ago
-
RE: Say hello and introduce yourself
@editor fab - thanks Mars, and keep up the great work o...
By normpang , 2 days ago
-
RE: Compressor and Evaporator Stratification
@trebor12345 So I think the 1st zigzag section shows so...
By ASHP-BOBBA , 3 days ago
-
RE: Is this just haze or something more?
@majordennisbloodnok I was giving a talk to primary sch...
By Toodles , 3 days ago
-
RE: Tesla Powerwall – More of a ‘Luxury’ Than an ROI Winner!
We had our Tesla Powerwall 3 (and Gateway) installed ea...
By Old_Scientist , 3 days ago
-
Indeed. With a battery its presumably the battery con...
By JamesPa , 3 days ago
-
RE: No-code, plug-and-play monitoring for your heat pump
To update an ESP device using ESPHome in Home Assistant...
By Grantmethestrength , 4 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
Said I would pop back with a update. Only Mr Jesus h...
By Burtis , 7 days ago
-
RE: Buffers, hot water and cooling
Thats presumably heat pump DT, what about radiator DT a...
By JamesPa , 7 days ago
-
RE: Who's your electricity provider and what's your tariff?
@chandykris Exactly the same here. We now have 13.5kWh ...
By Old_Scientist , 1 week ago
-
RE: Wood burner with ASHP - direct air?
This depends on the size of your wood burner and size/t...
By Lucia , 1 week ago