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Daikin Wireless Thermostat

 
Air Source Heat Pumps (ASHPs)
Last Post by RadWhisperer 2 months ago
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 TreeWizard
(@treewizard)
Active Member Member
Joined: 2 months ago
Posts: 9
Topic starter 11/11/2025 12:33 pm  

The placement of my Modoka wired thermostat is far from optimal, it's upstairs, in close proximity to a radiator, so the temperature measured is normally quite a few degrees higher than the rest of the house.  

I've applied an offset to the temperature sensor, to match it to a thermometer downstairs, which does half the job. However, the temperature downstairs fluctuates more, and drops by quite a few degrees more than the thermostat. 

The obvious solution is to move the thermostat, so I can keep living areas warm, then throttle radiators back upstairs, but wiring it somewhere more sensible would be quite a challenge.

I was surprised to see that Daikin don't have solution to solve this problem (unless I've missed it).

Without much more investigation, I've started considering the following options: 

- Automatically modifying the thermostat temperature offset using another wireless thermometer

- Automatically adjust the leaving water temperature offset, to effectively apply an alternative weather compensation curve.

- Wireless serial bridge, so I can move the Modoka anywhere, or just replace with a wireless third party thermostat?

I still need to understand the viability/practicality of the options,  has anyone tried to tackle a similar problem?



   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 3929
11/11/2025 1:27 pm  

Posted by: @treewizard
↑

just replace with a wireless third party thermostat?

I wouldn't replace with a wireless third party thermostat, thrid party controls and heat pumps are generally best not mixed.  If you do contemplate this you need to be careful which you pick, simple on/off not smart control.

Posted by: @treewizard
↑

- Automatically modifying the thermostat temperature offset using another wireless thermometer

- Automatically adjust the leaving water temperature offset, to effectively apply an alternative weather compensation curve.

- Wireless serial bridge, so I can move the Modoka anywhere

Obviously if you like tinkering these are in principle possible, but personally I stick to the rule that mission critical things in a house need to be operable by the least techy person in the house and repairable by a reasonable third party.  Thats not to say I dont have some home automation, I do, but everything will work without it.  Obviously this is a personal choice influenced by age as much as anything else.

Does Daikin do a wireless controller instead of the wired one, that would be the best option by far if its available.

 

Another option is not to rely on the temperature sensor in the Madoka at all and run on pure weather compensation (which is what I do with my Vaillant, and many other heat pump owners do).  This is going to be the most efficient and there is a good chance the most comfortable!


This post was modified 2 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 TreeWizard
(@treewizard)
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Joined: 2 months ago
Posts: 9
Topic starter 11/11/2025 1:34 pm  

Thank you for the advice.  Pure weather compensation would be a much simpler option, I'll check over the manuals and give it a go. 

For the time being, I've just set the offset to the maximum delta between the coldest and warmest points in the house. 



   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3929
11/11/2025 3:57 pm  

Posted by: @treewizard
↑

Thank you for the advice.  Pure weather compensation would be a much simpler option, I'll check over the manuals and give it a go. 

For the time being, I've just set the offset to the maximum delta between the coldest and warmest points in the house. 

If you do go for pure WC you may need to adjust the WC curve down (which will anyway improve efficiency) and possibly balance emitters.  Feel free to ask for guidance.  

If this is a recent install is there any point in asking the installer to relocate the Madoka to a sensible place where it can properly sense the IAT (even if you decide not to use that function) or is this water under the bridge?

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 RadWhisperer
(@radwhisperer)
Trusted Member Member
Joined: 3 months ago
Posts: 30
12/11/2025 7:34 am  

The switch from WDC to LWT i.e. pure WC is fairly straight forward. Your current WDC will apply to the LWT mode except now your thermostat is a read only sensor. Your app will show Inside Temp, Outside Temp & Leaving Water Temp. Also the current offset if you get as far as using the scheduling which is off by default in LWT mode.

Your water pump will switch from OnDemand to sample. You might hear the pump operate periodically, if it's annoying there is a setting to limit pump speed in sample mode.

You will likely find the house gets too warm so you can start to lower the cold weather (LWT) temp to closer match the heat loss of your home.

If you don't like it then just switch back to WDC and change the slope back to your previous values.



   
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