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Replacing my 18 month old Hitachi Yutaki ASHP

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 20 minutes ago
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3544
26/11/2025 9:35 am  

The dominant loud noise is the compressor or fan which you expect to be working at max during defrost.

The background rattle could just be ice, ice can make some funny noise!   I have never listened to mine that close up during defrost its much nicer to be indoors enjoying the fruits of its labour.  Another possibility is that something gets loose when its very cold.  Unless someone tells you otherwise I would monitor but not worry.  Have you tried sending that to Hitachi tech support?

How are you getting on with the data needed to set this system up so it (hopefully) warms the house with less intervention?  I assume thats the end game!


This post was modified 18 minutes ago by JamesPa
This post was modified 15 minutes 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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