E121 error code on Samsung 12kw gen 6 - Air Source Heat Pumps (ASHPs)

RE: E121 error code on Samsung 12kw gen 6

Mars — Fri, 08 Mar 2024 22:38:19 +0000

@craig1980 it’s been two years since you posted on this topic. Curious to know what happened.

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sun, 04 Dec 2022 17:12:07 +0000

I'm back now and having checked the energy use it seemed to run for longer and use more energy on #3 on all three settings although this could be down to outside temps as you said. I've put all three back to #2

I'm not sure if 2093 remote controller, room temp control should be the same as the others but that's what I've done so far.

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sun, 04 Dec 2022 16:42:16 +0000

@derek-m okay, thanks.

RE: E121 error code on Samsung 12kw gen 6

Derek M — Sun, 04 Dec 2022 15:57:47 +0000

In your situation the simple answer is no.

Because your controller is showing a value of 0.0 at the moment, this indicates that your controller is solely in WC mode, and takes no account of the indoor air temperature. The thermostats can switch the heat pump on and off, but the controller will only vary the LWT dependent upon the outside air temperature.

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sun, 04 Dec 2022 12:32:53 +0000

@derek-m I've just read this article on this site

https://renewableheatinghub.co.uk/flow-rates-efficiency-and-cop

They mention WC not working as the indoor temp sensor is in the warm room, like mine is in the airing cupboard. Could this be causing an issue for me too? Thanks

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sat, 03 Dec 2022 18:59:05 +0000

@derek-m I had also noticed the reduction in pump speed. It also dropped to 45 when we turned of WC a few days ago.

What KW we were using is a little irrelevant as we didn't have the heating on much and it was much milder at over 10 degrees. We were using as little as 8.6 up to 15kw. Now yesterday was 20 but the outside temp has dropped again and we are on 3.6 outside temp.

The indoor unit bit threw me off aswell. I assumed it was something to do with the box on the front of the UVC.

Yes, we are no longer short cycling. Hooray. Just trying to get it to run as efficiently as possible now. I'll see tomorrow if the 2091, 2 and 3 at #3 is better or worse.

One of the difficulties I have is that we were on LPG before and on auto fill so had no real idea how much we used. We also rarely ran the boiler apart from a few hours a day when it got cold. So I've no comparison for electric Vs previous gas use.

RE: E121 error code on Samsung 12kw gen 6

Derek M — Sat, 03 Dec 2022 18:42:58 +0000

Hi Craig,

First of all you will be using more electrical energy, since it is now colder outside. You should also be aware that electrical energy use by a heat pump is not linear with change in outside air temperature, but increases exponentially as the outside air temperature reduces. How much energy did you use?

I am assuming that the heat pump is no longer switching off for only 20 seconds?

One further interesting point is that the 'Inverter Pump' reading is now showing as 25%, which if you had a PWM controlled pump would mean that it would be running much slower. Don't change anything at the moment, but later it may be possible to try the pump on a slower speed setting.

What I don't understand is that the descriptions on the 'Master Indoor Zone Information' screen refer to an 'Indoor Unit', which you don't have in your system. I suppose it could just be that Samsung forgot to change the text in the software for the Monobloc heat pump.

Keep carrying out your tests, which I feel certain both you and others will find of use. One important thing to remember is that no two days are exactly the same, so making like for like comparisons may not always be possible.

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sat, 03 Dec 2022 17:51:17 +0000

So I'm now set on 2091, 2 and 3 at #3

I'll report back tomorrow to see how that affects run time etc.

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Sat, 03 Dec 2022 17:43:05 +0000

@derek-m so, I've been away for around 24 hours. System is running for around 20 hours a day according to operation time on the wired remote. COP of 3.4.

Outside temp is currently 3.4 degrees, LWT is 29.0, indoor on wired remote is 22 and room stats read 18.5.

House is comfortable and not too warm but that seems like a lot of power used for the day. That includes heating the hot water once during off peak time. Is it a lot or is that quite normal for a heat pump? I'm still on the same weather curve with 0 set back on the heat screen.

I'll change to the other value in 2091 for 24 hours as I'm away again in a bit and see what happens.

Ive not been here in daylight to check the Teva sensor yet.

1868 1869

RE: E121 error code on Samsung 12kw gen 6

Craig1980 — Fri, 02 Dec 2022 20:06:44 +0000

@derek-m it's okay, I was being impatient. It's hitting the temps fine I believe. I'm out for the night so I'll check again tomorrow. Thanks