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razor
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December 4, 2023
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Ecodan FTC- Had a nightmare trying to balance the house temperature?

  • December 4, 2023
  • 47 replies
  • 3068 views

Hi all,

I’ve just bought a new build with a Ecodan FTC. I have had a nightmare trying to balance the house temps. Too cold. Now too hot. 
I tried the weather comp but my numbers were way out. Downstairs was ok but upstairs was far too cold. 
Yesterday I changed to auto temp which wacked the flow rate up to 45 and in turn got the upstairs to temp (although downstairs is now tropical!)

My understanding is that the auto temp on the Ecodan uses the room temp to make flow adjustments. My issue is that the room temp on the Ecodan is reading like 8 degrees. I imagine this is why it was just flat out all day long.

I see you can change the sensor to be either the FTC which it is set at and no doubt where the temp of 8 is being read from, or the TH1 to use a wireless controller.

This is where I need help. There is a wireless unit attached but I am not sure if this is the correct thing. Used to connect the app.

How can I get the actual house temp to the Ecodan FTC to take advantage of the auto temp feature?

Thanks

 

 

Best answer by juliamc

 I think you’re way ahead of me with your controls, I have a Daikin so I’m not familiar with your system. However I’ve been wondering if the wireless sensor you’re using on TH1 either is faulty or is not set up correctly? I’m assuming the controller panel is giving a correct temperature reading around 8 or 9 degrees because it’s in a garage or similar unheated space, hence needing the wireless sensor? If you have another thermometer you can confirm both the controller temp and the wireless temp that would confirm a bit more about what’s going on. Then you could place the wireless sensor alongside the controller panel and check if the readings correspond, ie the wireless should show 8 or 9 deg. 
There is this section in settings to adjust the thermistors - this might show if anything odd has been set up.

47 replies

Show previous replies
C
Rank 2
Cold
Rank 2
January 9, 2024

Yeah, below 4 is a nightmare. I'm on £20 a day and I'm only on 15 degrees. I have an old house that I've insulated as well as I can. Draught proofed it where possible . Lots of the rooms have varying ceiling heights. I Inherited the ashp and had it serviced each year, but late summer. So the engineer didn't see it operating in cold conditions- Not sure if that makes a difference on not. Cheers

M.isterW
Rank 6
M.isterW
Rank 6
January 9, 2024

As your house isn't getting warm I'm wondering if your radiators aren't big enough. Are you running the system all the time or are you trying to heat the house quickly from cold? If it's the former then I'd suggest getting someone to do a heat loss assessment on your house and work out if your radiators are big enough.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
    C
    Rank 2
    Cold
    Rank 2
    January 9, 2024

    Running all the time now as it's on weather comp. But yes, I think heat loss assessment is the next step. Just still think that a flow temp of 50 (at the moment) would give me warmer radiators. They feel luke warm if not cold. Many thanks 

      M.isterW
      Rank 6
      M.isterW
      Rank 6
      January 9, 2024

      They won't ever feel hot because a heat pump delivers water at a lower temperature than a gas boiler. That's why they need to be bigger, to get more heat into the room.

      1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
        C
        Rank 2
        Cold
        Rank 2
        January 9, 2024

        Yeah I get that, just thought 50 would feel warm to the touch. 

         

        Another question for you. When using weather compenstion curve, will it ever try to achieve the inside target temp that you have  in space heating mode? Or does the weather compensation mode override it and stay on constantly? Hope that makes sense. 

        M.isterW
        Rank 6
        M.isterW
        Rank 6
        January 9, 2024

        The idea with weather compensation is that the heat provides just enough heat to get the house to your required temperature. You don't set a target temperature. Instead you adjust the compensation curve until you have the right inside temperature, then you leave it alone.

        With an Ecodan heat pump you have an additional mode, called auto adapt. You need a mitsubishi wireless thermostat but it will then use your selected inside temperature to adjust your compensation curve. Many people find it gives better results than weather compensation.

        1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
          juliamc
          Rank 20
          juliamc
          Rank 20
          January 9, 2024

          A flow temp of 50 would feel hot to touch.

          More questions: Does any of the pipework feel warm at all? You should have a 3 port valve which switches between tank and radiator heating (doesn’t do both together). Is this actually turning to the radiator position? Can you see what the flow rate is?

          I’m not familiar with the Ecodan controller but I’ve looked up that symbol next to the house symbol  and it means “standby” which suggests there’s no call for heat. If you set it back to fixed flow do you get any heat through the pipework?

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            OVO Energy Ltd, Floor 5, Crescent, Temple Back, Redcliffe, BS1 6EZ, (Company no. 06890795) registered in England and Wales.

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