Posted by: @transparent

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The CEO of MCS has appeared before the Select Committee on several occasions already.

For an afternoon of canapés and lattes? Is there a record and/or transcript of what was discussed? Would be curious to know why he was summoned. 

Ian Rippin, CEO of MCS, gave oral evidence to the Select Committee on Energy in Feb'25,
for which the transcript of oral evidence is available here.
The subject matter was retro-fitting existing homes.

He also appeared before the previous Select Committee in 2021 on the subject of Decarbonising Heat in Homes,
which is somewhat more relevant to us here on the forum.

The Committee Clerk tells me that a witness before the Select Committee will typically be speaking for 7-minutes.
That isn't very long, and usually allows each Committee Member to ask just a single question.

Given that situation, it's very much up to the general public to ensure that Committee Members are supplied with relevant facts/data in advance of such a hearing.

An MP can't ask a detailed question unless we've first briefed them.

Anyone can communicate with MPs on a Select Committee, irrespective of whether you are in their constituency.
Ie the usual rules of Parliamentary correspondence don't apply here.
This is usually done by writing to the Chair, but if another Committee Member has a particularly relevant skill-set, then contact them.

The topics which the Committee decides to investigate arise from these initial conversations.

@transparent, ooh, I'm going to go through the Retrofit failures one tonight!

As a complete aside, I've seen a few people on various platform have started call Ian Rippin, "Ian Rippin' Us Off" which is quite amusing.

@mairie - Your constituency member, Dr Zubir Ahmed MP, is a surgeon who also has an MBA.

He is Under-Secretary of State in the Dept of Health, with particular responsibility for Innovation.

As such we should expect him to be receptive to fact-based evidence presented to him.
Let's keep that in mind as we 'recover' your ASHP installation to the status it should've had when properly commissioned.
Keeping a diary of changes we recommend would be a good start, as would a photographic record.

As a Government (Junior) Minister, he doesn't sit on Select Committees.
The opposite is the case... he gets summoned by them!

Further update. I did send complaints to HIES and NAPIT. I'm not really clear what the role of NAPIT is over and above that of MCS and HIES, MCS said they are the certification body and I should contact them if concerned about 'compliance or the changes made to the certificate'. I fear the more bodies there are the less likely it is that any one of them will take responsibility for helping me. I'm not holding my breath! On the positive side, removing the overnight setback has so far seemed to have worked quite well for maintaining a comfortable indoor temperature in outside temperatures as low as -2. I've also blocked the 3 air vents in the garage and it definitely feels more comfortable in there. I did check the COP over a few hours on 2 cold days, it worked out at 3.5 on a day with outside temp around 7 degrees, 2.4 on a day with outside temp around 6 degrees. I wonder if the rounding of kW to whole numbers by the Daikin MMI as in the video from Toodles makes the data not very valuable over short periods. I've taken lots of screenshots from the app at various times to show inside temp, outside temp and LWT. Mostly LWT is close to what I would expect from the heat curve, with a few inconsistent readings. Some of those are perhaps when the domestic water is heating after a shower. I also do wonder if the outside thermometer can be a bit unreliable - it definitely gets confused sometimes when there is direct sunshine on the outside unit and I then have to turn up the water temperature on the app. The ASHP is on a southwest facing wall. Overall I'm hoping that the 9kW heat pump is the correct size which would be a huge relief, still maybe a question mark over radiator sizes/balancing and maybe system settings but I'll keep monitoring things. Thanks again for everyone's input and I will keep you posted.

Posted by: @mairia

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On the positive side, removing the overnight setback has so far seemed to have worked quite well for maintaining a comfortable indoor temperature in outside temperatures as low as -2

Thats good news and what might reasonably be expected if its close to the correct size.

Posted by: @mairia

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it definitely gets confused sometimes when there is direct sunshine on the outside unit and I then have to turn up the water temperature on the app.

OAT sensor needs to be out of the sun.  On a Vaillant its a separate sensor so you can position it correctly, sounds like it may be integrated on your Daikin, @toodles will know.  The sensor may be visible round the back (typically a steel coloured cylinder about 25mm long and 5mm dia attached to a wire).  In this case if you could apply some local shade it might help

Posted by: @mairia

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Overall I'm hoping that the 9kW heat pump is the correct size which would be a huge relief

I would say its more likely than not but of course only time will tell.

Once you are convinced its working correctly to keep the house warm we can take a closer look at COP.

Posted by: @mairia

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Some of those are perhaps when the domestic water is heating after a shower. 

... or during/immediately after defrost, which will be happening at night at present if your temps are anything like mine.

@jamespa Yes, the OAT sensor is situated on the back panel, near the top edge and in my case, it is protruding from the grill slightly and has a transparent tube over it for protection. As to accuracy, I find that +or- ~1.5 degrees is about as close as I find to other probes and weather reports including my local weather according to Amazon Echo (Mrs. A as we call it to avoid waking her at odd times). You are making good progress, keep us informed please! Regards, Toodles.