@old_scientist thank you! Tried changing to the first option but it is still constantly running 🙁

Posted by: @lch07

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@old_scientist thank you! Tried changing to the first option but it is still constantly running 🙁

I think you said you have a buffer.  Is it the primary or the secondary that is constantly running.  If the secondary is controlled by the heat pump or not.

Posted by: @lch07

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@old_scientist thank you! Tried changing to the first option but it is still constantly running 🙁

Click the link below (PDF download) and have a look at this diagram...

MIDSUMMERWHOLESALE.CO.UK "https://midsummerwholesale.co.uk/pdfs/quick-start-guide-samsung-gen-6-kits.pdf"

It shows how the system should have been wired and very basic settings. Your installer needs to start here then move forwards with you. 👍

@pirate-rich thank you, I will pass this onto the electrician when i hear back from them!

@lch07 it's frightening just how many of these guys just wing it and don't bother looking at wiring diagrams, wiring things how they think they could/should be done – this happened to us just three weeks and @pirate-rich came to our rescue.

Just thought id add an update just in case it helps in any way. My wife was a bit cold so I fired up the underfloor heating about an hour ago, checked the pump that was constantly running and now it isn’t running at all. This one has a green light on it which it didnt before.

I don't know how many pumps you have but I guess it's one in the heat pump itself and at least one other on the emitter side of the buffer.

There are various ways the latter could be connected some of which will lead to them running continuously, some only when there is a call for heat, and some in sync with the pump in the heat pump itself.  I guess that the plumber has changed this 

It's yet another reason (as of there was any need for another reason) not to have a buffer, but unfortunately many installers still fit them unecessarily, together with third party unlabelled wiring centres which merely serve to confuse.

If it was working before, whoever changed it most recently needs to put it back as it was  or rewire it all in accordance with the manufacturers instructions if there is a circuit diagram for your plumbing configuration.

Posted by: @old_scientist

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That's strange. According to the manual, with those settings the pump(s) should cycle 7 mins off, 3 mins on

Try changing #2091 and #2093 to the settings ending 'water pump 1'. When the compressor turns off, the pumps should run for 1min and then stop until the compressor restarts

When set to 'water pump 2', the pumps should run continuously, and set to 'water pump 3' (as they are now) the pumps should cycle 7 mins off, 3 mins on which as @pirate-rich says allows the heat pump to see when the water has cooled sufficiently to restart the compressor.

@old_scientist I realise that the pump running 24/7 is now thought to be due to incorrect wiring and not the FSV settings. I just wanted to check that my understanding of the FSV settings is correct. The 7 mins off and 3 mins off pump cycles only applies when the LWT value has switched the compressor off (because LWT is too high or Delta T is too low etc) and doesn't apply when the thermostat is no longer calling for heat. Is that your understanding too? I only ask as some of your comments seemed to suggest otherwise.

Posted by: @mike-h

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Posted by: @old_scientist

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That's strange. According to the manual, with those settings the pump(s) should cycle 7 mins off, 3 mins on

Try changing #2091 and #2093 to the settings ending 'water pump 1'. When the compressor turns off, the pumps should run for 1min and then stop until the compressor restarts

When set to 'water pump 2', the pumps should run continuously, and set to 'water pump 3' (as they are now) the pumps should cycle 7 mins off, 3 mins on which as @pirate-rich says allows the heat pump to see when the water has cooled sufficiently to restart the compressor.

@old_scientist I realise that the pump running 24/7 is now thought to be due to incorrect wiring and not the FSV settings. I just wanted to check that my understanding of the FSV settings is correct. The 7 mins off and 3 mins off pump cycles only applies when the LWT value has switched the compressor off (because LWT is too high or Delta T is too low etc) and doesn't apply when the thermostat is no longer calling for heat. Is that your understanding too? I only ask as some of your comments seemed to suggest otherwise.

Yes, I've been following. It never occurred to me that the pump(s) may not be wired into the controller, as my own system uses a Joule pre-plumbed cylinder, including pre-wired valves and pumps which eliminates a lot of the potential for an installer to get things wrong 😀 

I don't know for certain, but I think that is a reasonable assumption to make, and can be confirmed by observation once pump(s) are under control of the Samsung controller. 

Update for those following! Electrician came today and it’s now no longer constantly running, he did mention that he’s been back and forth with Samsung and the panel needs a software update as it’s not allowing some of the settings that should be on to be turned on!

We live in a new build estate and he mentioned all of the properties have the same issue, so they are arranging someone from samsung to come and sort them all!

@lch07 They must be wired into the Samsung control panel so they're controlled by it, hopefully thats what your guy has now done.

Posted by: @lch07

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We live in a new build estate and he mentioned all of the properties have the same issue, so they are arranging someone from samsung to come and sort them all!

This is going to be interesting because Samsung’s support has always had a questionable reputation. I'll very interested to see how that goes.

At least your pump has stopped running unnecessarily for now.

As a complete aside, one of my guests on the podcast claimed that pumps (in many forms) consume something like 10% of the world’s electricity. If that’s even close to accurate, it underscores how absurd it is that we accept heat pumps with leaking, humming or misbehaving circulators as normal.