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Ecodan Pump Issues… Circulation pump turns off when heat pump compressor turns off

 
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Air Source Heat Pumps (ASHPs)
Last Post by ASHP-BOBBA 2 hours ago
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 F1p
(@f1p)
Estimable Member Member
Joined: 3 months ago
Posts: 46
14/01/2026 7:02 pm  

Posted by: @ashp-bobba
↑

Posted by: @patch321
↑

Just noticed this balancing valve on the flow pipe - do these come as standard?  Seems

odd since the recommended flow is 31 L/min and the maximum is goes upto is 28 L/min 🤨

 

20260114 181839

Sorry are you saying this is the return or flow to the ASHP external unit?

 

 

This is the 'OUTLET' from the external unit yes (so flow, before 3 way valve), as the magnetic filter is shown just below

 


This post was modified 2 hours ago 2 times by F1p

   
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 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional Installer
Joined: 1 year ago
Posts: 352
14/01/2026 7:05 pm  

@f1p Perhaps they are not restricting and for some strange reason just installed it to read the flow rate?

Completely not needed and adds a bit of resistance for something covered by the controller


This post was modified 2 hours ago 2 times by ASHP-BOBBA

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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 F1p
(@f1p)
Estimable Member Member
Joined: 3 months ago
Posts: 46
14/01/2026 7:08 pm  

Posted by: @ashp-bobba
↑

@f1p Perhaps they are not restricting and for some strange reason just installed it read the flow rate?

Completely not needed and adds a bit of resistance for something covered by the controller

Throwing ideas out there, to protect pipework if they use a particularly large primary circulation pump on the 11.2's and someone does increase the speed?

I don't see anything about requiring it in the install manual and I haven't seen one installed before so agree that it doesn't really seem necessary 

 



   
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 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional Installer
Joined: 1 year ago
Posts: 352
14/01/2026 7:11 pm  

@f1p I think it could me more there didn't realise the ASHP can indicate the flow when you are setting it up, where units do not have flow meters and were fixed speeds you would have to install an indicator but I think most brands now display the flow rate. I am trying to make stuff up to justify it 🙂

 

 


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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