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

Mifczu 65499 267
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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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  • #1 17378392
    Mifczu
    Level 11  
    Hello,
    I have a Termet ECOCONDENS GOLD Plus boiler. I bought a ROUND controller with Wi-Fi - Open-Therm. I connected it according to the instructions (2x0.5mm ~ 10m cable, to the Open-Therm gate, I took out the RT short-circuiting cable). I started everything at home I have 25'C so I set the thermostat to 35'C, turned on the stove winter mode. But nothing is happening on the stove, there is no information that it will turn on. The controller shows that the connection is with the OT gateway and the Wi-Fi gateway. Does anyone have an idea what could be wrong?
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  • #2 17378497
    piracik
    VIP Meritorious for electroda.pl  
    Maybe it switched to SUMMER mode based on the outside temperature?
  • #3 17378699
    Mifczu
    Level 11  
    I have no external sensors. Besides, there is a radiator on the stove, so there is winter mode
  • #4 17380301
    serwis25
    Level 20  
    The Honeywell ROUND controller with a WiFi gateway is dedicated to ECOCONDENS CRYSTAL boilers and requires power from the boiler.
    All information on the ECOCONDENS GOLD boiler controls is available on page 15 of the boiler manual.
    Only the controller with its own power supply, eg Auraton, can cooperate with the OT connector in the Gold boiler.
    Best regards.
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  • #5 17380531
    Mifczu
    Level 11  
    @ service25 The leaflet suggests that the Honeywell ROUND regulator, supposedly with Gold, also works https://www.termet.com.pl/upload/upload/pliki...ow/Ulotki/Ulotka_gold_plus_marzec_2018_Qm.pdf What would you suggest? Replace the driver itself, is the whole package useless? Because there is also an On-Off set that differs probably only in that the communication is one-way.
  • #7 17445072
    zygmunt22
    Level 10  
    obviously new after November 2017 Ecocondens Gold Plus works with Round WI-FI Opentherm. I am using it and everything works. Check by serial numbers in Termet if your boiler is already adapted to opentherm. The driver board has both open and on-off connectors, but it all depends on how the board is programmed.
    This is control by a foreign server so the commands are executed after about 2 minutes (depends on the speed of the internet connection).
  • #8 17495640
    Kropek3
    Level 13  
    zygmunt22 wrote:
    obviously new after November 2017 Ecocondens Gold Plus works with Round WI-FI Opentherm. I am using it and everything works. Check by serial numbers in Termet if your boiler is already adapted to opentherm. The driver board has both open and on-off connectors, but it all depends on how the board is programmed.
    This is control by a foreign server so the commands are executed after about 2 minutes (depends on the speed of the internet connection).


    It's true, but the latest version of the software is b11, available from 01/10/2018. Apparently, the boiler previously worked with Opentherm on the b10 software version you mentioned, but it had some minor problems and it was not possible to use all the available functions.
  • #9 17750106
    Apollo.PL
    Level 7  
    Kropek3 wrote:
    zygmunt22 wrote:
    obviously new after November 2017 Ecocondens Gold Plus works with Round WI-FI Opentherm. I am using it and everything works. Check by serial numbers in Termet if your boiler is already adapted to opentherm. The driver board has both open and on-off connectors, but it all depends on how the board is programmed.
    This is control by a foreign server so the commands are executed after about 2 minutes (depends on the speed of the internet connection).


    It's true, but the latest version of the software is b11, available from 01/10/2018. Apparently, the boiler previously worked with Opentherm on the b10 software version you mentioned, but it had some minor problems and it was not possible to use all the available functions.


    @ Kropek3 Does this mean that the b.11 software fully supports OpenTherm and there are no problems with b.10?
  • #10 17750945
    Kropek3
    Level 13  
    @ Kropek3 Does this mean that the b.11 software fully supports OpenTherm and there are no problems with b.10? [/ Quote]

    I don't know the details that exactly, but the b12 version that has already been released solves the problems so far.
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  • #11 17750972
    Apollo.PL
    Level 7  
    Kropek3 wrote:

    I don't know the details that exactly, but the b12 version that has already been released solves the problems so far.


    @ Kropek3 Many thanks for the info!
  • #12 18002950
    krzys-iek
    Level 20  
    If someone is looking, I sent the driver to this company Tester and they downloaded b12 for free. How it will work with different drivers I have not checked yet. Overall it looked very positive, nice conversation and in the same week I had the driver back! The gentleman from the website explained a lot to me (unfortunately I lost the notes somewhere) but I remember that this whole protocol is implemented differently in the drivers and it is not really the standard I thought. They try to adopt soft so that it also works with drivers that implement OT stupidly or not completely.

    SALUS WIRED CONTROLLER OPENTHERM RT520
    ELEKTROBOCK PT52 OPENTHERM ROOM THERMOSTAT

    Both can be found on pazzegro. They are at a similar price - any experiences with them on b12?
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  • #13 18139497
    Wojtermet25
    Level 30  
    Hello everyone.
    Boiler and controller as in the topic in the latest edition. How is the flow temperature control of the central heating circuit implemented? What is the temperature set on the boiler, because I can see that after connecting the controller it is not possible to set the weather curve. Does the OT driver take into account the external one at all?
    The boiler has not yet been launched by an authorized service technician, hence these questions, because I will not learn much from him.
    Yours sincerely Wojtek.
  • #14 18155686
    Kropek3
    Level 13  
    Wojtermet25 wrote:
    Hello everyone.
    Boiler and controller as in the topic in the latest edition. How is the flow temperature control of the central heating circuit implemented? What is the temperature set on the boiler, because I can see that after connecting the controller it is not possible to set the weather curve. Does the OT driver take into account the external one at all?
    The boiler has not yet been launched by an authorized service technician, hence these questions, because I will not learn much from him.
    Yours sincerely Wojtek.


    Boiler and control room in the latest edition - Can you write more precisely in what?
  • #15 18158816
    Wojtermet25
    Level 30  
    Boiler production 1932 board UNI 02v02 soft 12. I do not have access to OT for now, but the production date is relatively fresh.
  • #16 18158884
    zygmunt22
    Level 10  
    the latest soft is ver 14
    what does it mean "I have no access to OT"?
    I suppose you don't have opentherm regulator.
    on the boiler controller board, after removing the jumper, the OT connector will be active.
  • #17 18158947
    Wojtermet25
    Level 30  
    It means that I am a lazy person and I do not want to open it to read the version, because the sticker must be inside. Tomorrow there will be an installer and I will read it to conquer the assembly. I have Round control from OT. As for the boiler software version, they apparently have old supplies, because the boiler production is fresh. Are there any significant changes in 14 compared to 12?
    The question about the logic of control by OT is still valid.
  • #18 18159082
    zygmunt22
    Level 10  
    Wojtermet25 wrote:
    It means that I am a lazy person and I do not want to open it to read the version, because the sticker must be inside. Tomorrow there will be an installer and I will read it to conquer the assembly. I have Round control from OT. As for the boiler software version, they apparently have old supplies, because the boiler production is fresh. Are there any significant changes in 14 compared to 12?
    The question about the logic of control by OT is still valid.


    the software version is shown on the boiler display during loading, no sticker is needed for this.
  • #19 18159098
    Wojtermet25
    Level 30  
    The version of the boiler software is known, I have 12. It's about the OT gate, which is not displayed on the boiler?
  • #20 18159352
    zygmunt22
    Level 10  
    Wojtermet25 wrote:
    The version of the boiler software is known, I have 12. It's about the OT gate, which is not displayed on the boiler?


    Round OT wifi honeywella gateway is a type of prosthesis compared to the full Opentherm protocol.
    termet has adapted its product to full OT but with Tech drivers, CR 11011.
    Your gateway doesn't use all the protocol.
    Termet does not offer it in the Round Opentherm wifi version and in the on-off version for Ecocondens Gold Plus boilers.
    In one of the P settings it is possible to select work with weather regulation, with no weather regulation and work with the OT gate. ver 12 of the boiler controller.
    Pay attention to this when commissioning.
  • #21 18159398
    Wojtermet25
    Level 30  
    Thank you for the information. The technical catalog also proposes this OT gate with Round wi fi and I bought one, but probably a bit hurriedly because I did not know that it was such an OT prosthesis, and I wanted to preview via the net. I have the setting in the boiler menu on OT. And now the question is, are you able to say whether this prosthesis takes into account the external and the internal, or what is the way of regulating the CO?
    Does any of the proposed drivers have the ability to remotely adjust or view via the net?
    Regards Wojciech
  • #22 18159421
    zygmunt22
    Level 10  
    Wojtermet25 wrote:
    Thank you for the information. The technical catalog also proposes this OT gate with Round wi fi and I bought one, but probably a bit hurriedly because I did not know that it was such an OT prosthesis, and I wanted to preview via the net. I have the setting in the boiler menu on OT. And now the question is, are you able to say whether this prosthesis takes into account the external and the internal, or what is the way of regulating the CO?
    Does any of the proposed drivers have the ability to remotely adjust or view via the net?
    Regards Wojciech

    when you enter ecocondens gold plus, there is only on-off.
    in practice, it looks like round wifi modulates the boiler power in relation to the set temperature and sometimes also downloads info from the outside temperature (heating curves) but is not able to shift these curves and be a fully dynamic controller.
    It will also not learn the heat load of the object in order to obtain the room temperature set by you within a given time.
    I do not know any room temperature controller with OT and wifi that works with Termet boilers. Ask the factory about it. Such regulators are available on the market for other boiler companies.
  • #23 18178688
    Silok
    Level 8  
    Hello, I have an ecocondens gold plus 25 boiler and with it the ATC928 evohome Wi-Fi Honeywell open therm controller. I have had the boiler since June and today I switched to winter mode and it does not heat up. I have icons for the tap (left) and the heating curve and radiators (right) displayed on the boiler. Somehow I changed the heating from 2 to 2.7 and it didn't work, then I changed it to 4 and it still does not heat.
    On the Honeywell controller I set the temperature to 27c and it still does not heat up. On the Honeywell controller at the top, on the blue bar in the upper left corner, the Internet connection icon (two squares: upper - white - full and the bottom transparent - empty). When I enter the installation menu - system summary, we have: boiler control - bridge open therm 0% and living room - radiator valve, evotouch sensor 0%.
    It seems to me that the boiler is not connected to the Honeywell controller and therefore I cannot control the boiler and therefore five do not heat up.
    What should I do to make the cat start to sin
    Regards, Michał
  • #24 18186877
    arturo172
    Level 2  
    Hello, I have a question how to connect the Salus 091FLRFv2 controller has two inputs No and Com plus power, to ecogold 25 where in the strip Termet ECOCONDENS GOLD PLUS + ROUND with Wi-Fi - Open-Therm - connected incorrec Termet ECOCONDENS GOLD PLUS + ROUND with Wi-Fi - Open-Therm - connected incorrec
  • #25 18187035
    bro2004
    Level 30  
    After all, it is written in the user manual on the Termet website .... In the Salus manual also ....
    I fart ....


    Moderated By piracik:

    3.1.13. Take care of linguistic correctness and follow the rules of netiquette.

  • #26 18187172
    arturo172
    Level 2  
    bro2004 wrote:
    After all, it is written in the user manual on the Termet website .... In the Salus manual also ....
    I fart ....
    I understand your nervousness because maybe it's a clear matter for you, but I would like to be sure of this connection, but I do not want to shoot any error and I would like to have a clear case
  • #27 18232260
    krzys-iek
    Level 20  
    My friend

    I do not know what this driver is, but the OT in termeta is a non-polarized connector to be connected to the opentherm driver. So you have nothing to do, how is it supposed to work? In addition, the short-circuited RT, i.e. the boiler is controlled only from the panel, based on the return and supply temperature.

    I do not know RXRT510 but you did not show A / B or OT here. You can see that this Salus driver is a normal ON / OFF (It's a bit lame as Termet has OT but it will work ...).
    NO / COM connects with RT in termeta (by removing jumper). Something old, this termeta plate, I have 5-8 connectors filled, some tank timer and something else.

    I tested the Salus RT520 and the opentherm works. The only disadvantages (considerable) is that the power supply from AA is obligatory (!) Although it could be powered by OT. Weak DHW program - no time control, only it will constantly monitor the set temperature from the menu (you already have the same on the boiler controller).
    RT520 has no weather forecast ... When a sensor (thermistor) is connected to 3-4, the icon on the thermometer starts flashing. It means that the weather device is supported by the OT driver. And that stupid Salus doesn't have it. You have to switch P26 to 3 in the service menu (the weather controller stays in the boiler).

    L and N are probably 230V power supply and it is weak in my opinion (the thermostat probably heats up because the power supply must break down to some 5V).

    Termet works without any problems, so with:

    Salus RT520 (nice but primitive, AA power required!)
    Easy Remote (Italian, many options but no backlit LCD)
    PT52 Elektrobok (wrong translation of PL in places, but has the most options)
    CR11011 and others, which are proud of the termet on the website.
  • #28 18237196
    eRd
    Level 11  
    I have a quick related question.
    Is it possible to connect the Termet Ecocondens Gold Plus boiler to the Sonoff wi-fi controller or similar instead of an on / off gateway so that in the easiest and cheap way you can start the heating from the level of the application on the phone, e.g. an hour before coming to the building (service premises, opened daily in different times for several hours, so it would be impossible to program perfectly). This on / off in Termet works by shorting some contacts? In this case, you need to buy a relay for Sonoff that would close / open one of them?
    An additional option would be to connect an external temperature sensor, but as I understand it, it is enough to connect the thermet according to the instructions to the contacts 3, 4 and it will then control the heating according to the heating curve instead of the return temperature.
    I'm sorry if I should have a separate topic. In this case, I ask the moderator to transfer. Thank you in advance for your help.
    best regards
  • #29 18238033
    krzys-iek
    Level 20  
    eRd wrote:
    I have a quick related question.
    This on / off in Termet works by shorting some contacts? In this case, you need to buy a relay for Sonoff that would close / open one of them?
    An additional option would be to connect an external temperature sensor, but as I understand it, it is enough to connect the thermet according to the instructions to the contacts 3, 4 and it will then control the heating according to the heating curve instead of the return temperature.


    Yes sonof, it already has its own transmitter from what I remember potential-free (i.e. the contacts are hanging without voltage, shorted or not), so ideally you connect the RT contacts bridged with mains supply (easy to convert to potential-free). In fact, if you smoke once every few hours and rarely get the fungus, the best termet model? Buy something cheap + sonof or whatever.

    Heating curves for this application are also a sick idea, sorry :)
  • #30 18239001
    eRd
    Level 11  
    From what I know, Sonoff has 230V output. To use it instead of a jumper, you have to change it. Here, for example, I found a description for the TH10 model Link .
    I think I will order one with a temperature sensor to have info about the temperature in the building and at the same time be able to start heating. Apart from connecting this Sonoff, do you need to change anything else in the boiler settings?
    As for the boiler model, it was not my choice. I am not a specialist, so I relied on the experience of the assembly company, supposedly due to the economy and failure-free operation.
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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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