Hot water and heating control with my Mitsubishi Ecodan Air-Source Heat Pump (ASHP)?

I’m now trying leaving my temperature the same night and day. On octopus Go I get 4 cheap hours at night when typically the heating hasn’t been running as it’s been set back from 9pm to 6am. Those cheap hours are just when the house loses a bit of heat then the hp’s been fired up in the standard price hours. I tried Cosy but it didn’t suit us, I think it would work fine with a battery, so you can charge up in the 2 cheap 3 hour slots, then run the house on the battery during the 3 expensive hours.

This is a lot to take in .....thank you everyone.  

I'd rather leave my temperature at 16degrees as I think the room temp reader is reading temp incorrectly and it heats bedroom to 17.5 when set on 16, so setting at 18 would be too much for us, as it would end up being nearly 20 degrees.  But I can trial that.  Although saying that I dont want the heating on between 4-7pm, so do I just bring desired temp down below room temp to turn it off then? Rather than setting timers or schedules as they are called?   

And for my hot water it already comes on once a day at whatever time it fancies....can I not have it come on every other day, or is that not efficient?

Also I haven't a clue if the engineer set it to 18 or not, I'm going to have to call him aren't I.  And he did point out very basics and said to leave it....said I could turn it down to 10 at night if didnt want it on....I imagine he meant during summer.  I have no idea!  

But I will watch the videos, thank you all.  I'll get back to you.

Oh I dont have a battery, this government scheme doesn't include them grrr .....I'll try to save up for one in the future.  

Yes set the controller to 16 degrees, that’ll work fine. I don’t have a battery either… one day !!

If you’re at home then you can just take the room temp on the controller down a degree at the start of the peak rate, then back up at the end of the peak rate. See how that goes, though to be honest the heat pump will run more smoothly without the stop/start, and you may not save anything in the long run. It’s a super efficient piece of kit !!

This video explains how to set timings on the ecodan. In it he says the process is the same for heating or hot water. You can have timings set for individual days of the week, so @Auds you can set it for maybe Tuesday Thursday and Saturday and leave it off for the other days. It would be interesting to know how it’s set at the moment. This video doesn’t say where to switch off the legionella cycle (which may be called “disinfectant”), but you may already have found that. 
Let me know how you’re getting on with it. 

Hi everyone,  well lastnight I left it on 15, and I haven't touched it since.  It was on during the night at some point heating us up, and then it came on late morning too, just the heating.  The hot water is currently at 46 and hasn't heated today, so I reckon that is because I left heating to come on......I'm now praying it doesn't come back on until after 7pm!  Fingers crossed.   The room is holding temperature well at present and all afternoon. 

Also even better news.....yet why it's taken over a week to happen.....the company who installed them aresending someone out Friday to do a walk through of the work carried out, and to go through the controls with me!!! Yes!!! So thank god for that....I'd sent a huge message of questions to the ecodan manufacturers today too lol.  

He also clarified that my solarisnt switched on yet!!!  There was me constantly checking the app thinking why is it at zero and not working doh!!!  So wish they had said this to me earlier as I'd not have stressed so much!  Anyway so looks like all will be explained.   I will update you.

Oh and in the schedule its all blue so no schedule has been done at all, just on all the time.....I'll find out what the temps etc are from this guy and ask him to tweak for me, or talk me through while I do it, as I learn better by doing it as I'm told how to.

Thanks so much to you all.  I'll be back Fri or Sat to update you 😁🤗

This is so not funny!! Bloody hot water comes on at 6pm, water was 46 degrees!!! It's still going now and it's reached 54 degrees for crying out loud.  That guy is going to be changing it on Friday lol!  I'm not impressed!

That’s very annoying. I’ve found this video which explains how to set up the legionella program, unfortunately it doesn’t mention how to switch it off, but it does show how to see the way the timings have been set up. You could run through the video and then check what’s actually set up on yours. It sounds like it could be running very often, and at 6pm is a ridiculous time to run it anyway as it’s during peak hours. What a shame the installer isn’t paying your electricity bill. Then he’d think twice about the setup.

Having seen what your settings are (please report back if you find out) you might be able to switch it off just by deselecting the tick. That may make more sense when you see the video which is all I have to go on. Sorry I don’t know more about your system 🤦‍♀️

That video is great but oh look I do not have an edit button!!!  I was about to sort it then, well the guy on Friday is going to be sorting this out for sure!!  I can untick it though......I'll speak to the guy on Friday.   So I guess I can't change my hot water temps either, or know what they are! So annoying! It's going to be costing me a fortune!  Just had email from octopus they took 4.57 for from 29-30 Jan....not sure why they doing that and not monthly, but I also hope that is charge for both the 29th and 30th as4.57 a day is not good!