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Octopus Cosy Heat Pump Owners & Discussion Thread

 
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Air Source Heat Pumps (ASHPs)
Last Post by AndrewJ 10 minutes ago
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 AndrewJ
(@andrewj)
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Joined: 11 months ago
Posts: 109
Topic starter 21/11/2025 11:30 am  

@jamespa sorry for the confusion.  Simply.  Battery was holding 16kW at 5:30 and at 7:30 it was showing 11.5kW.  I can see the house load usage stated in kW: I've seen that move from 1.6kW to 3.2kW (mostly towards the latter) but this is clearly a point in time figure.  

Currently, at 11:19, it is showing a load of 0.5kW on the house which is in line with normal background load so it would imply the Cosy is not running right now.  I daresay it will start up again before too long and I'm glad I have solar as it does help a lot on these sunny days.

I have spoken to Octopus and it requires an engineer visit to enable a drop of the Cold Weather flow temp min below 50c.  I've explained the whole situation to the After Care team and an engineer is going to visit next Thursday and hopefully I can have a more in-depth discussion with him/her.  Given what I've documented so far, and not being an expert, is there anything specific I should be asking them?

I have also managed to get into the Cosy Controller which gives me some minimal info - other data requires an installer code which I don't have.  The flow temps at 10:12 are shown in the image and are at a deltaT of 3.8c.  Unfortunately After Care can't see the flow rate so I have to wait until next Thursday for the engineer to tell me.

I haven't screwed all the LSVs down - none are fully shut and two are fully open.  I'm not going to make any more changes to the WC curve until I see the engineer as I don't see the point.  I am going to have to use the TRVs on the Study and the Landing as I'm sitting here at 25.2c and sweltering!  I'm also going to turn it down in the bedroom as 24+c is too hot.  I presume that is unlikely to affect anything with 15 radiators in the house plus a volumiser but is there anything I should look out for?

 

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