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Hitachi Yutaki SCombi Heat Pump - Owners

 
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Air Source Heat Pumps (ASHPs)
Last Post by Sim0n0 20 minutes ago
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 Sim0n0
(@sim0n0)
Active Member Member
Joined: 3 days ago
Posts: 9
29/11/2025 12:43 pm  

@editor Just seen your book 'Bodge Busters' with a forward by Graham Hendra. Graham Hendra formerly of Freedom Heat Pumps who supplied the Hitachi system to our installers including all the parts I now know have no place in a heat pump system. Low loss headers, individiual room thermostats etc.



   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3582
29/11/2025 12:44 pm  

Posted by: @sim0n0
↑

@jamespa Latest issue is the system getting 'stuck' in hot water mode and not switching back to heating. The motorised valve can be operated manually.

What does the controller show - does it show that its in heating mode or does it show its in dhw mode?  It could just be a stuck valve/faulty conection

 


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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 Sim0n0
(@sim0n0)
Active Member Member
Joined: 3 days ago
Posts: 9
29/11/2025 12:48 pm  

@editor Big ad on this site advertising £7500 saving on a heat pump. NOT if that £7500 went to the developer! As the first owner of our property, I was forced to pay serveral thousand pounds to rectify an incorrectly designed and installed system.



   
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 Sim0n0
(@sim0n0)
Active Member Member
Joined: 3 days ago
Posts: 9
29/11/2025 12:58 pm  

@jamespa I honestly do appreciate you trying to help but it's nothing obvious. It's in DHW mode which is set to 48 degrees - temp gets up to 48 but it's not switching back to heating. If I turn heating and DHW both off, then turn them back on, it starts working again. The Honeywell value is operating normally so it must be controls/wiring related. I've turned DHW off and switched the immersion on 24/7. I'll look into a different heat pump brand in the new year...


This post was modified 19 minutes ago by Sim0n0

   
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 Sim0n0
(@sim0n0)
Active Member Member
Joined: 3 days ago
Posts: 9
29/11/2025 1:00 pm  

@jamespa I guess it could be a faulty connection. The original installers fitted all the cables so badly that the mental case wouldn't fit. It's sat on the floor of our plant room ever since



   
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