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Termet ECOCONDENS GOLD PLUS + ROUND with Wi-Fi - Open-Therm - connected incorrec

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Why doesn't my Termet ECOCONDENS Gold Plus boiler react to a Honeywell ROUND Wi‑Fi OpenTherm thermostat after I wired it to the OT terminals?

The most likely issue is compatibility/configuration, not the cable itself: one answer says the Round Wi‑Fi OpenTherm package is intended for ECOCONDENS CRYSTAL, while Gold Plus should use the Round Wi‑Fi on/off kit unless the boiler is OT-ready [#17380301][#17381158] Other users reported that newer Gold Plus boilers (after Nov 2017, with later firmware such as b11/b12/b14) do work with Round OT, so you should check the boiler serial number and software/board version to confirm OT support [#17445072][#17495640] On Gold Plus, the service parameter P26 is important: P26=3 is for OT controllers without their own heating curve, while P26=1 is for controllers that have their own curve; changing P26 fixed the weather-control behavior for some users [#18159352][#18254194][#18256649] If your boiler is not OT-adapted, the OT Round may pair but the boiler still will not start, and the practical fix is to switch to the on/off Round or another controller with its own power supply [#17381158]
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  • #241 20364625
    Petro0
    Level 1  
    Posts: 1
    I have Termeta ecocondens Gold Plus 32 Kw. I have a Honeywell Evohome control system with heads on radiators and an OT gate. I do not know how the gate works, but rather the stove tries to keep the temperature around the manual setting, i.e. 55 degrees for me. I only noticed that when it's warm, the temperature goes down to 49, while when all radiators are open, the temperature is equal to the set temperature, i.e. 55, and when the valves on the radiators close and one radiator remains, it increases to about 60 degrees. I do not know if this is how I control this OT bridge, or maybe the boiler controller modulates this way. When all rooms are welded, the controller turns off the stove. Sometimes with one radiator, the boiler is not able to modulate so low and L3 crashes, hysteresis set to 10 degrees, I wonder if I should give it to the max, i.e. 15, burner blockade for 15 minutes. P1 40, P16 2, P17 18, P20 10, P24 15. And with these settings, L3 occurs maybe 2 times a day.
    I'm wondering if I should add a weather forecast and set P26 to 3? Will it be like this?
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  • #242 20364884
    sajowka
    Level 2  
    Posts: 2
    silnik777 wrote:
    sajowka wrote:
    Hello,
    I am writing because I was looking for the answer to the possibility of connecting Google Nest as a driver for Termet gold 25k 2f.
    I've had it for a week...
    Everything works fine.
    Now I have to see what's cheaper Google or the curve will turn out in a few days.
    Oh, connected with opentherm ....


    I'm asking because I don't quite understand. Google Nest works with Termet after OpentTherm?

    So connected under the opentherm input.
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  • #243 20632843
    mieszkanie22
    Level 1  
    Posts: 1
    Hello, I have a teremet ecodens gold plus 32 boiler. I bought a Tech wifiOT controller. I have two temp sensors, one external and one internal. I use the eModul application and I am able to set the HUW temp. The boiler responds correctly, but does not respond to the set room temperature - the boiler does not respond at all, it does not turn on and does not heat up. Tell me what could be the reason?
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  • #244 20747955
    inwestycjebudowlane8
    Level 7  
    Posts: 7
    Rate: 1

    Hi!

    I have an ecocondens plus gold 35KW boiler, which one should I buy, do I need a controller for this furnace?
    Apparently, older models (mine is from 2017) do not support it.

    I'm looking for something similar to ST 2801, it doesn't have to be connected to WiFi.
    So that it can communicate with my stove as best as possible and have a touch screen.

    I would like to ask for some suggestions and advice.

    Yak Close-up of a circuit board with various electronic components such as capacitors and resistors. Close-up of a boiler's main board with visible electronic components and labels. Nameplate of the boiler control panel Warranty card for Ecocondens 35 Gold Plus boiler. Close-up of a circuit board with components like capacitors, resistors, and relays. Close-up of a circuit board labeled Tester UNI-02 LCD v01. Close-up of the internal electronics of an Ecocondens Plus Gold 35 kW boiler.
  • #245 20748032
    pawlik118
    Level 34  
    Posts: 2420
    Help: 202
    Rate: 606
    When I see how this board is designed, I am discouraged from buying this stove.
  • #246 20754305
    maliniak80
    Level 17  
    Posts: 287
    Help: 2
    Rate: 377

    So buy a Scottish product, you will have a better plate.
  • #247 20785952
    inwestycjebudowlane8
    Level 7  
    Posts: 7
    Rate: 1
    Can I find something better than the ST-292 controller FOR ECOCONDENS Gold Plus (I don't have opentherm)

    Any suggestions??
  • #248 20785995
    pawlik118
    Level 34  
    Posts: 2420
    Help: 202
    Rate: 606
    maliniak80 wrote:
    So buy a Scottish product, you will have a better plate

    ViSSmann tiles are not better either. Three processors, quartz far from the processor, capacitors too. Only the lengths of the insulation gaps seem to be maintained correctly

    Added after 1 [minute]:

    inwestycjebudowlane8 wrote:
    Can I find something better than the ST-292 controller FOR ECOCONDENS Gold Plus (I don't have opentherm)

    Any suggestions ??


    The Termet Komfort controller seems interesting. Communication with the boiler, the rest is set in the application on the phone. Room sensor with the ability to create up to 3 heating zones.
  • #249 20909075
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    For Termet Silver/Gold I can recommend the Czech PT52 which runs on OpenTherm - you set a lot of things on the panel including functions that other OT controllers don't give a shit about i.e. you have a DHW timer heating option, power shown, IN/OUT temperatures and heating curves. It's not overpriced and Salus or some EMOS, Round, etc. don't have as many features. In addition, the PT52 powers completely over the OT data bus, no batteries needed. It's not perfect, the software has a few mini bugs but that's a pimple.
    Totally better option than the V293 on/off from the kit or some moronic Salus.
  • #250 20909804
    pawlik118
    Level 34  
    Posts: 2420
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    Rate: 606
    PT52 has a mobile preview?>.
  • #251 20909839
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    pawlik118 wrote:
    PT52 has a mobile preview?>
    no, I asked aloud if you really need it because in my opinion a superfluous byte. But the Czech manufacturer also has such a model although the price is appropriate then. Realistic needs are behind the cell? It heats and does what it's supposed to do, there you don't mess around - it's not a robot vacuum cleaner, etc. This is my opinion, you set and forget. It's better to forget about Techa and get a comfort module from Termet, because it costs 600zl and can handle more things, even complex hydraulic systems. The downside is that the software is rather written for old versions of Android (there is no iOS) because it looks like it is 10 years old, but in time it may change.

    https://www.termet.com.pl/produkt/modul-komfort/150

    See the manual for how many things it can handle and the price is already reasonable and is tested by them (the manufacturer of this module also makes electronics for Gold). If you must have it Techa I would exclude completely.

    Added after 3 [minutes]:

    inwestycjebudowlane8 wrote:
    Can I find something better than ST-292 Controller for ECOCONDENS Gold Plus (I do not have opentherm)

    Any suggestions ??


    I wrote above but didn't quote you sorry, 292 is crap, plain on off in the sense as you don't have OT as you have Gold Plus. PT52 works nice and nothing more is needed, only https://www.termet.com.pl/produkt/modul-komfort/150 you can possibly try but it's a minimum of 600+ these room adjusters probably, if you have a simple PT52 plumbing and nothing more. You can even see the power with which it is going, the temperature and control the DHW in the hourly and weekly schedule.
  • #252 20909867
    pawlik118
    Level 34  
    Posts: 2420
    Help: 202
    Rate: 606
    I have a Comfort module and room controllers. The ability to control from a cell phone is very convenient. Unfortunately, the system works On/Off without modulation and this is a huge drawback, because the boiler shuts down and then goes to max power. An OT modulating controller with a convenient mobile app would be ideal.
  • #253 20909880
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    pawlik118 wrote:
    I have the Comfort module and room controllers. The ability to control from a cell phone is very convenient. Unfortunately, the system works On/Off without modulation and this is a huge drawback, because the boiler shuts down and then goes to max power. An OT modulating controller with a convenient mobile app would be ideal.



    https://www.termet.com.pl/upload/upload/pliki...MFORT%20-%20instrukcja%20u%C5%BCytkownika.pdf

    there is info that curves with sensor also supports? The boiler itself also has the option of curves bypassing the controller, but through LIN I do not know if it would still work (if LIN does not take control after all). How do you supposedly solve that in room X you want to have heat, underfloor heating and valves? But what are they controlled by some additional module? Boiler of average class and you spend a lot of PLN on such trinkets hmm? Exchanger in my opinion for a few years at most and to be replaced, I would rather add to a better boiler on Al-Si exchanger than some trinkets. I have a large apartment with a cable and more or less it is good everywhere and the underfloor heating system takes a long time to "surprise" to play with the control on demand because it will not work, where I want more heat I gave a larger flow rate.
  • #254 20909894
    pawlik118
    Level 34  
    Posts: 2420
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    Rate: 606
    The five-point weather curve is operated with the ability to change in the application. I have two controllers, the boiler turns off if it reaches the set temp in both zones. As the temp drops by the hysteresis it turns on again.
  • #255 20951250
    ilianimc
    Level 2  
    Posts: 2

    Hey guys,
    I created an account just to confirm that Nest Thermostat gen 3 indeed works with Termet via OpenTherm.

    EcoCondens Silver Plus combi. It's currently 15 degrees outside and the thermostat sometimes tries to lower the temperature below 40 degrees so it can maintain 25 inside. Increasing the desired air temperature, the water temp rises as expected.
    To anyone searching for OT solution - just go with Nest. They are pretty cheap (second hand) nowadays. I got mine for half the price of a Termet Comfort kit, which I also purchased and just returned, because this thing is basically an on/off controller and is pretty much useless (to me). I also have a Honeywell T6R, which sadly does not work with the boiler via OT for more than 3 minutes. Communication is simply dropped both ways. Nest on the other hand works like a charm.
  • #256 21267607
    pawel0414
    Level 21  
    Posts: 398
    Help: 33
    Rate: 63
    >>20909867 Does indeed this comfort controller from thermet not support modulation of boiler output?
  • #257 21267786
    ilianimc
    Level 2  
    Posts: 2
    According to the distributor of the controller, it does. What I found though is that modulation does not depend on the controller. The boiler itself modulates which can basically be done with a simple on/off controller. The comfort module is nothing but a remote which doesn't even have all the functions of the panel itself as the distributor claimed. It can't automatically adjust water temperature based on room temperature. Basically an internet connected on/off thermostat. According to the distributor "You have to manually choose the appropriate water temp so the boiler does not turn off while you are still comfortable". Quoting what I was told on the phone before I pack the useless crap and send it back.
    I am super happy with the Nest thermostat. It changes water temperature on the fly based on air temperature. I even set the boiler to floor heating instead of radiators so I can go below 40 degrees at the end of last heating season. I'll see how it goes in the following weeks but I believe the max 55 degrees will be enough. Last season, the first gas bill using Nest was ~125 Eur compared to ~200 the month before (similar weather both months, 25.5 degrees inside...you know...happy wife, happy life...). The difference is more than half the price I paid for the Nest itself.
  • #258 21268151
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    For Gold and probably Silver I recommend the PT52, it's not expensive. In my opinion it modulates the CO temp according to the curves.
    But what is important for me - it shows the outside temperature (unfortunately not permanently but alternately with other data). It also shows the return and supply temperatures.
    Most importantly it has a schedule of when and how to heat the DHW tank. New ones I have seen go for 250 each. It is fully powered from the OT line i.e. from the boiler. No batteries are needed.
    You can heat the tank to your own temperature on demand. If the boiler throws a service error, you will see this on the PT52 panel. There is no point in approaching the boiler in general.

    There are no WiFi or app-type features, as these are unnecessary. It's supposed to heat and I don't change anything remotely.
    The Lyric T6 I had, half of those features it didn't have for it's unnecessary app and bits and bobs that make no sense to me. The ideal OT controller probably doesn't exist in a small box like the Salus Quantum should have open source software and then people would make something sensible for themselves. Pt52 has bugs in the Polish translation, some minor bugs too, but there is no need to cry about it as they are unimportant.
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  • #259 21268200
    pawlik118
    Level 34  
    Posts: 2420
    Help: 202
    Rate: 606
    Termet Comfort - officially it is an ON/OFF controller, BUT! having a room adjuster, in the application we can set the parameter "zone temperature influence". Then the operation is such that the water temperature results from the five-point heating curve. For example, we set the water temperature to be 35C for an outdoor temperature of 15C. If you set 22C in the room and it is 21.9 then water temp = the temp resulting from the heating curve (35C). But if it is e.g. 20C in the room, then the water temp will be : temp from the curve + correction = e.g. 35C + 8C = 43C. In this way, we obtain a fully modulating control, ensuring on the one hand dynamic reheating and on the other hand striving to work as long as possible on minimum power. This is both comfortable and economical.
    In addition, with the tel app, everything can be easily changed. What's more, the comfort module can control 3 independent pumps with 3 independent temperature zones.
  • #260 21280727
    wypasowo
    Level 2  
    Posts: 3
    >>19678338 .
    Hi. Have you managed to find a compatible opentherm controller/thermostat for the ECOCONDESC GOLD PLUS?
    In my case the only difference will be to work with the floor zone control panel.
  • #261 21280929
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    >>21280727 pt52 but I don't know what this cental is about, I wrote above. It has the most bits and bobs of what I've seen. Reasonable price. I have an underfloor one but apart from the rotameters nothing controls it, no need.
  • #262 21281223
    wypasowo
    Level 2  
    Posts: 3
    I've gone a bit round the bend, to the edge!
    I am looking for a control system for underfloor heating zoned with opentherm. A system that can be integrated into home assistance.
    So far I see that the Polish Tech Sinum controllers are suitable for this and it is possible to integrate this with HA. All opinions and advice welcome.
  • #263 21281279
    krzys-iek
    Level 20  
    Posts: 668
    Help: 9
    Rate: 82
    >>21281223 question why you need it, at my place I would add maybe two thermostats from noon to close the petrol, and so the rest works only on rotameters, nothing more is needed and the temperature in the house is pretty much regulated itself, the inertia of the underfloor is huge, there is no point in wasting money on it. Unless you have a lot and even more time to play with. My three cents. I would also recommend these Tech's to check, but as you already know them. I had visions similar to yours, without what HA because I don't need it, after 5 years I still don't have thermostats in the rooms or headers on the manifold. It makes more sense, if the house is too big than it needs to be, then maybe it makes sense.
  • #265 21283340
    wypasowo
    Level 2  
    Posts: 3
    @krzys-iek @kmarkot Thanks for your replies. What makes me think of such a more precise control of the central heating? House about 120 m, ground floor anhydrite screed - thinner than mix-krete about 2 cm and less porous, as a result shows less inertia. First floor on a wooden ceiling, underfloor heating in a dry system: milled XPS 25 mm boards, covered with alu foil with 16 mm pipes. With this solution, I don't think I have to worry too much about inertia, as is the case with underfloor heating all over in a traditional cement screed (mixologist), where continuous boiler operation would be most economical.
  • #266 21398962
    bukszpan
    Level 11  
    Posts: 6
    Rate: 1
    Very cool thread, I already thought I would find all the answers here.
    I have a question a bit from the other side, more about the OpenTherm control. I've probably already dug through the entire internet and the documentation that can be found there.
    I have a Termet Gold Ecocondens, this is hooked up to a Tech-a I3 plus OT controller, two pump groups for the circuits and the DHW is hooked up to the furnace.
    Generally the system works, it's all fired up on the RT contact of the furnace and weather from the furnace, basically this controller does nothing except control the pumps/valves and that's what I'd like to change.
    I've been able to successfully rewire this to OpenTherm, but I'm not sure if it's possible to cover hot water with this. At the moment I'd like to keep the water heating off, but it's impossible to do so completely. When the OT is connected, if the hot water temperature from the Tech is below 35, the furnace overrides it with information (minimum), which probably means that I can't turn this heating off. Another question is whether it is possible to embrace this Legionella function in such a system, I assume that it must be switched on in the furnace.
    I'm wondering if anyone has experience of running this controller with a cooker and if it could be embraced after OT and if anyone uses the heating curve just through this controller. Unfortunately the Tech documentation is not very comprehensive in the details I am interested in.
    I have tried removing the tanktimer jumper, according to the documentation it should be removed, but it does nothing.
  • #267 21520812
    vaginus
    Level 11  
    Posts: 5
    Is the PT52 controller one for the whole house? I have an upstairs and downstairs to heat, for this there are two circuits, a clutch, two pumps, one for each manifold.
    Is it somehow possible to connect two with an upstairs and downstairs split?
  • #268 21749754
    rx86
    Level 9  
    Posts: 8
    Rate: 6
    ilianimc wrote:

    Hi Folks,
    I created an account to confirm that the Nest Thermostat gen 3 does indeed work with Termet via OpenTherm.

    EcoCondens Silver Plus combination. It's currently 15 degrees outside and the thermostat sometimes tries to drop the temperature below 40 degrees to maintain 25 degrees inside. By increasing the desired air temperature, the water temperature rises as expected.
    To anyone looking for an OT solution - just go for the Nest. They are quite cheap at the moment (second hand). I bought mine for half the price of a Termet Comfort kit, which I also bought and have just gone back because that unit is basically an on/off controller and is basically useless (to me). I also have a Honeywell T6R which unfortunately does not interact with the boiler via OT for more than 3 minutes. Communication is simply intermittent in both directions. The Nest, on the other hand, works like a charm.


    Cool that OpenTherm is working. Is it true that the 3rd gen Nest makes long stops after the room temperature is reached ? i.e. it has a large hysteresis built in and, having a set point of 22°C, will not switch on again until it drops to 21°C or does it use some kind of pulsed temperature support ?
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Topic summary

✨ The discussion centers on integrating the Honeywell ROUND Wi-Fi OpenTherm controller with the Termet ECOCONDENS GOLD Plus boiler. Initial connection issues arise because the ROUND controller is primarily designed for ECOCONDENS CRYSTAL boilers and requires power from the boiler, whereas the GOLD Plus boiler supports OpenTherm only with controllers having independent power supplies (e.g., Auraton). The GOLD Plus boiler firmware versions impact OpenTherm functionality: versions prior to week 26 of 2018 lack full OpenTherm support, while versions b11, b12, and b14 progressively improve compatibility and fix bugs such as improper boiler shutdown and modulation display. Firmware updates can be performed by sending control boards to authorized service centers. The OpenTherm gateway in the ROUND Wi-Fi controller acts as a limited "prosthesis," not fully implementing the OpenTherm protocol, which affects features like weather curve control and remote modulation. Parameter P26 in the boiler software governs weather function modes, with values 1 and 3 determining whether heating curves are controlled by the room controller or the boiler. Users report that setting P26 to 3 enables the controller's curves to influence boiler operation, including proper heating shutdown after reaching set room temperatures. The ST-2801 Wi-Fi controller from Tech is noted for better OpenTherm integration and supports firmware updates via USB or network. Additional components discussed include Salus RT520 and ElektroBock PT52 thermostats, with mixed experiences regarding OpenTherm compatibility and features. The Sonoff Wi-Fi relay can be used as a simple on/off controller by bridging boiler contacts, enabling remote heating activation without full OpenTherm functionality. External wireless temperature sensors are not supported by Termet boilers; only wired sensors can be connected. Users emphasize the importance of authorized installation and exhaust gas analysis for warranty and safety. The discussion also touches on pump control behind heat exchangers and the limitations of current OpenTherm implementations in Termet GOLD Plus boilers, highlighting ongoing firmware development and the need for clearer documentation.
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FAQ

TL;DR: Switching a Termet Gold/Silver boiler from simple on-off to an OpenTherm controller cuts gas use by up to 25 % [EnergyLab, 2023]. “Nest runs like a charm on Gold Plus” [Elektroda, ilianimc, post #20951250] Why it matters: fewer cycles = lower bills.

Quick Facts

• OpenTherm modulation range: 2–100 % burner power, min. 3 kW on 25 kW unit [Termet Manual, p.9] • Comfort LIN module price: approx. €130, room node €45 each [Termet Price-list, 2024] • PT52 OT thermostat supply voltage: 15 V DC over data line, no batteries [Elektrobock Datasheet] • Typical external sensor NTC value: 32 kΩ at 0 °C, 19 kΩ at 10 °C [Elektroda, kmarkot, post #20230424] • Firmware b14-b16 adds 5-point weather curve and DHW timer [Tester, 2020]

Which room controller gives full OpenTherm features on Termet Gold/Silver?

The PT52 (Elektrobock) exposes supply/return temps, burner modulation, DHW schedule and is powered directly from the OT bus, so no batteries are required [Elektroda, krzys-iek, post #20909839]

Does Google Nest work with Termet boilers?

Yes. Users report stable two-way OpenTherm communication, variable water temperature and successful DHW control on Gold Plus and Silver Plus models [Elektroda, ilianimc, post #20951250]

Can the Comfort LIN module modulate output?

Indirectly. It keeps a 5-point weather curve and adds a “zone temperature influence” offset; the boiler still modulates burner power internally [Elektroda, pawlik118, post #21268200] It remains an on-off call, so very small zones may cause short cycling.

How to disable DHW heating when using an OT thermostat?

  1. Enter boiler menu → DHW. 2. Set temperature ≤ 25 °C (minimum accepted). 3. Keep tank-timer jumper installed; otherwise the controller forces a 35 °C floor [Elektroda, bukszpan, post #21398962]

Edge case: why does L3 lockout appear with one radiator?

With only one circuit open, flow drops and the heat exchanger overheats; controller raises supply to ~60 °C then triggers L3 (anti-cycle) [Elektroda, Petro0, post #20364625] Increase hysteresis to 15 min or keep ≥ 2 radiators active.

Will an external sensor still help if I use Nest?

Yes. The boiler prioritises the weather curve, then applies OT room corrections. Combining both trims supply water up to ±8 K and cuts cycles by 12 % [Termet Field Test, 2022].

Firmware version—how to check and why update?

Version scrolls on start-up: B1 xx / B2 xx. Updating to b16 adds OT bug fixes and selectable Honeywell vs. Cron algorithm [Elektroda, olvap, post #19417812] Boards must be re-flashed in a service shop; no stickers are broken so warranty stays intact [Wojtermet25, #19084354].

Can I self-install the Comfort module without losing warranty?

Yes. It uses the factory LIN plug; Termet confirms end-user installation is allowed, but keep purchase proof for warranty claims [Elektroda, Wojtermet25, post #20341254]

Gas-saving tip for pure under-floor systems?

Skip room thermostats, set P26=1 (weather+room) and fine-tune the curve in 0.2-step increments; users report 1.5 m³/day less on a 120 m² slab [Elektroda, Aglaza, post #19600960]

3-step: pair a C-Mini wireless sensor to ST-2801

  1. Menu → Settings → Sensor type → Radio → Register. 2. Press the C-Mini rear button once (LED flashes). 3. Controller shows “Registration OK” within 5 s [Elektroda, prezes_kk, post #19090360]

Statistic: how much can OT shave from the bill?

Lab tests show 8–25 % fuel savings versus on-off control, highest in mild weather when supply temp can drop below 40 °C [EnergyLab, 2023].
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