Suffolk peasant

Well the energy consumption MMonday was 15 and zero generation. I turned it off in case it was damaged / broken. No internal alerts on the controller but there are loads of codes on the pump behind a panel so given that either the pump or telemetry was broken I called out an engineer. Pump is OK so heating is back on and awaiting an engineer. The 37C is working well so once I have a way of working out what is working I will resume changing settings. Thanks everyone and once it is fixed I will post how good I manage to get it.

Today I have used 15KWh and according to the generation read out precisely 0 KWh. It is the same consumption as yesterday but it is considerably warmer today. Yesterday when it was very cold is used 16 qnd generated 5. How can turning the temperature down by 3C, can the genereation be reduced to 0? I am at a loss. I will leave it another day and turn it back to 40 and see if that makes a difference.

House is wood construction apart from a brick chimney [sealed] Double glazed, airtight - walls marine ply then 140 frametherm 32 then plaster. MVHR for air exchange. I think I will just have to accept that the telemetry is broken on the generation side and I will have to do it from amount consumed at the meter. I will just keep adjusting the settings as per all the advice above and may well throw in some more questions. Thank you everyone.

I made the change to fully open the mixer valve, this has raised the temperature at the manifold by about 3 degrees so it was definitely not calibrating well at low temps. This should allow me to lower the temperature going through the floor which should improve the COP. Todays readings are as ridiculous as yesterdays, 16KW used and 5 generated. So I rank this as a sucess in that it is marginally better. As the manifold in now 3 degrees warmer, I will lower the temp to the UFH by 3. So thank you @JohnMo for that. Round two commences.

I have opened up the the mixer to max and am going to let it settle overnight. I get daily readings so I would like to see what difference that makes - then I will lower the water if the house stays warm - but it's good to know that you keep a barn warm on 30C - I shall set it as a target to meet 🙂

Thank you everyone - I just feel so helpless. I did look at heatgeeks as a friend has used them, but the local recommended firms didn't appear too wonderful, and they weren't Samsung experts as far as I could see - and I am beginning to think they may need to be. I want to exhaust all the control and flow settings before I focus on the ASHP itself.

The whole place is open plan downstairs and I have MVHR, if it is 21 downstairs it is usually 16 upstairs without doing anything - and that is fine for sleeping for me. I don't think the UFH is working too hard, the temp in is 40 and it chugs along nicely.

It is not a cold house - it is very small 60MSq on the ground floor, all open plan, MVHR to move air The immersion makes very little difference. With all the heating turned off my summer daily consumption is about 6KWh so I can remove that from the usage through the winter and it seems to be reporting correctly.

I'll open it right up now and report back tomorrow. I have the current manifold temperatures and see if they differ in the morning.

My first post - and only because I have had to admit defeat after reading and trying to fix my rubbish COP. I really have tried and it is not from lack of googling and trying things. The ASHP is controlled by a gen 6 Samsung controller, it supplies DHW and DH with a once a week immersion boost. I have DHW set to 47, and for heating 40. I have gone through all the settings on the field setting system and apart from lowering the default HW and heating every setting is default. Downstairs is UFH, upstairs is radiators [not used as not needed - open plan] The mixer valve is set to 45 - I suspect it isn't entirely accurate as at 40 it doesn't deliver hot water to the manifold reliably. The flow in the manifolds are such that there is a temperature drop of roughly 5 degrees across each of the circuits. When I looked at the menu on the controller that that shows consumption and generation what I have indicated for the last week is Consumption 124KWh Generation 38KWh Help - where do I look to get these figures almost completely reversed? Hoping you can help.

Was there sufficient ventilation in the basement once you removed the de-humidifier to stop recurrence?