What are you trying to do, is it switch off space heating for the summer or something else?

Easy way just set your hopefully single thermostat to min setting. If this built-in in to controller or standalone it's the same process. When you need heat anyone can easily ramp up setting on thermostat and you have heat.

If running Weather compensation there is usually a setting for max outside temperature you want heating active. Just set to a temperature suitable to your home and heating needs between 15 and 20 is normal.

Thanks for the replies.  Yes I would like to switch off space heating for the summer.

We have thermostats on half the radiators and no controls on the others.  I have the heat pump temp set to 20c and that is as low as it goes.  I believe its only thermostat is in the control unit which is directly above one of the radiators with no thermostatic control.

I skipped through the lg user manual and I can see why you have asked the question!  My Vaillant heat pump has a simple on/off/timed selection for heating.  In actual fact it's still set to 'on' (24*7) but it also has a 'max temp for heating' setting and another setting which inhibits heating if the indoor temperature is above a certain value, so in reality its mostly but not completely off.

Unless an lg expert is reading this I think your best option is to tell us a bit more about how you operate your heat pump (eg are you using 'ai' (aka weather compensation) mode, how have you set the temperature on the native controller.  From that we may be able to offer a suggestion.

Assuming you are using ai mode do you know the settings?

What I suspect you need is ai mode combined with using the internal sensor as a limiter, set perhaps 1-2 degrees above your target value.  

@jamespa Thanks for the response.  Some 30 years ago I wrote computer programs - even at that stage it was recognised that a non-technical person was best for writing documentation, and merely producing screenshots rather than a narrative (in terrible English) was not the way of the future.  Alas LG seem not to have progressed to that point !

I was initially using AI mode (as advised by the installer), but the maximum I could lower its target temp was 5°C which was not enough. So I have moved to 'heat' mode which has a minimum setting of 20°C.  I expect these values could be changed by tinkering in Installer Mode, but I'm wary of fiddling with things that I don't understand - all the more so when there is no decent documentation to guide me.

My previous heat pump (a NIBE Fighter 2005 installed 16 years ago) had a simple toggle switch to disable space heating in the summer.  I had assumed that the replacement technology would be just as good. 

Posted by: @alwayscold

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So I have moved to 'heat' mode which has a minimum setting of 20°C.

If your lowest flow is set to 20 degs, if room temp is equal to or above 20, water being circulated will be at that temperature anyway so heat pump will remain off for heating. If circulation pump is on any solar gain will be redistributed. Basically the radiators running in reverse i.e. a radiator cooler than room will take in heat rather than give off heat. Same is the for UFH.

There will be a YouTube video on settings I am sure. To allow you to do something different.

Posted by: @alwayscold

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I was initially using AI mode (as advised by the installer), but the maximum I could lower its target temp was 5°C which was not enough. So I have moved to 'heat' mode which has a minimum setting of 20°C.  I

As an aside my understanding is that lg AI mode means weather compensation.  If I'm right then moving away from ai mode is likely costing you money and causing you to have to fiddle more with controls than you need to and/or compromising comfort. The fact that you needed to depart from the ai mode setting by 5C , which is a lot, just shows that it wasn't set up correctly!

My strong recommendation to you is to read a bit the installer manual and get your ai settings adjusted correctly.  This will be difficult until the next season.  Correctly set up weather compensation should enable you to operate simultaneously at maximum comfort and minimum cost throughout the season whilst tweaking almost nothing.  It feels like magic, but it works.

Posted by: @jamespa

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The fact that you needed to depart from the ai mode setting by 5C , which is a lot

That is a huge amount, and may indicate you have moved the wrong parameter.

Thanks for that.  I've gone back to ai mode now and will keep looking for some YouTube pointers.

How long would you expect a change on the control box to come into effect at the heat pump ?  There must be a lag so I want to avoid overcompensating like a pendulum. 

I would only make changes after 24 hrs, but we have UFH. On radiator would still leave for 24 hrs for everything to stabilise.

Set curve

Min flow temperature at 20 degrees, design flow temp at design temp. Then only adjust the design flow temperature (cold outside temp end of the curve) to get stable house temp. So if too cold you need more heat etc...

Just to add to above,when adjusting WC heat pump should be on 24*7 and all trvs or thermostats set to max.  The idea is just to balance demand and supply with the flow temp as low as possible consistent with heating your house.  If rooms settle at different temps, adjust lockshield valves to balance.

At this time of year you may struggle to get it right though so expect to readjust in the autumn and probably a final time mid winter.  Or just leave for now trying to get it perfect, do a crude adjustment and wait until autumn kicks in to perfect it.

Addressing your original question, according to the leaflet here

THEHEATPUMPWAREHOUSE.CO.UK "https://www.theheatpumpwarehouse.co.uk/wp-content/Manuals/LG_Monobloc_32_leaflet.pdf"

it features 'seasonal auto mode' which allows you to define temperature bands within which it heats, cools, or does neither.  I think that's probably the adjustment you want to do what you originally asked!