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I need help with Ecodan ASHP

 
Air Source Heat Pumps (ASHPs)
Last Post by Andris 45 minutes ago
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 Andris
(@andris)
Estimable Member Member
Joined: 6 years ago
Posts: 138
Topic starter 27/10/2026 2:18 pm   [#3210]

Here’s a picture of the controller for an Ecodan ASHP. It’s not mine; it belongs to a friend.

When I was at his house six months ago, I noticed that the installer had left it on a fixed flow temperature of 50°C (insane!). I told him I’d switch it to weather compensation, as it should be much more efficient.

He called me recently to say that the heating wasn’t working. I switched it back to fixed flow just to make sure that the problem wasn’t caused by the changes I’d made.

I’ve attached a picture of the screen. I’ve set it to a fixed flow temperature of 40°C. The hot water works without any problems, but when we turn on the thermostat, the heat pump doesn’t start.

Can anyone spot anything on the screen that might be preventing the heat pump from starting?

If it’s easier, feel free to PM me and we can have a chat over the phone. I’ve already tried a few things, so I’d really appreciate any help. Thanks in advance!

 

IMG 20261026 WA0003

 


16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.


   
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 F1p
(@f1p)
Estimable Member Member
Joined: 12 months ago
Posts: 129
27/10/2026 2:21 pm  

From the symbols on the screen i see no schedule set to prohibit it, so the demand for heat may be coming from an external 3rd party thermostat wired in or Mitsi room controller?



   
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 Andris
(@andris)
Estimable Member Member
Joined: 6 years ago
Posts: 138
Topic starter 27/10/2026 2:26 pm  

@f1p that is what I thought. He has 9 thermostats huge house. Some rooms massive galss so very diffrent heat needs all over the house. I will tey to turn them all off then one by one see if any of them start the pump. I think they are all wired in. I will find that out cant remember what make is it.


16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.


   
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 F1p
(@f1p)
Estimable Member Member
Joined: 12 months ago
Posts: 129
27/10/2026 2:30 pm  

@andris there is only one "IN1" connector on the ecodan to create demand 
I see it's a single zone setup, so it may be all 9 go to a heatmiser or similar and then any combination of demand creates an on/off to the ecodan

The pause symbol is showing it's sitting Idle anyway, suggesting no demand was active at the moment of the photo



   
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 Andris
(@andris)
Estimable Member Member
Joined: 6 years ago
Posts: 138
Topic starter 27/10/2026 2:35 pm  

@f1p This is good i wanted to make sure that nothing is restricting. I will have a look at the thermostats. Thanks


16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.


   
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