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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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  • #121 18341856
    Wojtermet25
    Level 30  
    @dacher
    And you can do more about this interface. It searches for nothing on the web.
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  • #122 18342281
    dacher
    Level 11  
    The module is connected to the main plate of the furnace with the already prepared connector - the cable sticks out. It allows you to connect via WiFi to an application available on the network, which allows you to control the service parameters of the furnace, shows its operating parameters. I saw the matter at a service technician. I wanted to buy myself but Termet refused because it was only for the service ?
    How do you find access to purchase to let me know - maybe the Tester will sell directly?
  • #123 18342287
    lasekd
    Level 13  
    I would also like one piece for me :)
    Can you provide a link to this app?
  • #124 18342347
    Tiesto83
    Level 12  
    dacher wrote:
    I saw the matter at a service technician. I wanted to buy myself but Termet refused because it was only for the service ?
    How do you find access to purchase to let me know - maybe the Tester will sell directly?


    Well, unless we have a friendly service technician on the electrode :)
  • #125 18342680
    Wojtermet25
    Level 30  
    Thank you for the information. It looks interesting, but the price is still interesting.
    Unfortunately, I am not a service technician, but maybe I can find out something somewhere. If someone succeeded, of course I also ask for info (it can be priv).
    Best regards.
  • #126 18343599
    dacher
    Level 11  
    I am attaching a PDF file with comprehensive information:
    Attachments:
    • IR_2018_04-prezentacja-Termet.pdf (884.14 KB) You must be logged in to download this attachment.
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  • #127 18343607
    dacher
    Level 11  
    What's the price is the news that Termet deleted 300 PLN for service technicians.
    But with this module it is a different stove ?
  • #128 18356643
    Tiesto83
    Level 12  
    I connected the CR11011 to my Gold (soft B10). I did not expect that there will be communication because I have a boiler from November 2017.
    It works. It shows quite a lot. As everyone says, the antediluvian interface itself. But the manual looks good.
    I am not getting into "intelligent" heating curves so far - but I hope that after updating the firmware in the boiler (B15 is still the latest?), I will have a piece of "intelligent" control.
  • #129 18364751
    dziadzia1982
    Level 7  
    Hello
    I have a honywell round wi-fi on / of driver connected to ecocondens gold plus ver 12 and a weather sensor.
    The stove is spinning all the time, it turns on for a moment, then it turns off, etc.

    How to enter the service settings to change parameter P26
  • #130 18365689
    Wojtermet25
    Level 30  
    Describe the installation, because it looks like boiler timing, which means that there is too little energy consumption in relation to the boiler power. Maybe the starting power is terribly large and the boiler will not have time to enter the modulation mode and it overheats by 5 * and turns off.
  • #131 18368365
    dziadzia1982
    Level 7  
    Wojtermet25 wrote:
    Describe the installation, because it looks like boiler timing, which means that there is too little energy consumption in relation to the boiler power. Maybe the starting power is terribly large and the boiler will not have time to enter the modulation mode and it overheats by 5 * and turns off.


    building 160m / 2.
    2 separate risers up and down.
    in addition, a 100l tank with a Walio new star circulating pump, turned on 3 times a day for 3H.
    Earlier, the deditrich mcr II 24KW furnace was in operation, there were no problems
    outlet temp at the curve 2.5 54 s / C return 36 s / C
  • #132 18368807
    Wojtermet25
    Level 30  
    Now I have read that you have an on off driver, give this parameter P26 to 1.
    When you change it, observe the operation of the boiler and describe what is happening, how the temperature changes and whether it displays anything when it turns off.
  • #133 18368832
    dziadzia1982
    Level 7  
    Previously, yes, I had 1, now I have 3. Is it possible that the old weather is crazy
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  • #134 18368883
    lasekd
    Level 13  
    What old weather do you mean. P26 03 this is work with boiler curves
  • #135 18368886
    Wojtermet25
    Level 30  
    It should be on 1
    3 is for the Open therm controller which does not have its own heating curve.
    Write again what is to be crazy?
  • #136 18368892
    dziadzia1982
    Level 7  
    The stove is turned on, it works for a certain time, then it turns off and in a moment it turns off again
  • #137 18368906
    Wojtermet25
    Level 30  
    But describe exactly how long it takes and what happens in turn, how the temperature behaves and whether then it displays, for example, L3.
    And read before you post because the prompter changes words.
  • #138 18368925
    dziadzia1982
    Level 7  
    Nothing is displayed. It just turns off and on.
  • #139 18368929
    Wojtermet25
    Level 30  
    This is something wrong. And disconnect that Round. Do as it was at the factory, i.e. the thermostat contacts in the boiler are closed.
    First try to set P26 to 0.
  • #140 18368939
    dziadzia1982
    Level 7  
    I just suspect the weather. So I will
  • #141 18369010
    Wojtermet25
    Level 30  
    I'm more of this thermostat. And I was wrong, I meant P26 on 2 but I don't know if it actually cuts off the thermostat, because maybe something is not in contact in its system and that's why it freaks out so much
  • #142 18371072
    dziadzia1982
    Level 7  
    the same thing happens after the thermostat is deactivated
  • #143 18371437
    Wojtermet25
    Level 30  
    Then disconnect it physically and put the jumper as it was at the factory.
    And write down all the P parameters, maybe we're looking for something. Because the behavior is strange. If it overheated it would be L3 blockade
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  • #144 18403229
    dziadzia1982
    Level 7  
    Problem solved.
    The curve on furnace 2.0 was set too low.
    After switching to 4.5 everything is back to normal.
    Thanks for the advice and help
  • #145 18878896
    DjAbra
    Level 11  
    Hello.
    I am getting ready for the renovation of the central heating, from the gravity boiler / cast iron heaters to new condensate + new tubes / heaters.
    The Termet installer from my area, when asked about controlling heating via wifi, suggested EVOHOME from OT, I have not asked him about other options yet.
    EVOHOME seems to be cool because it has the ability to set zones / rooms with an individual temperature (using appropriate heads with a temperature sensor in a given room).
    ST2801 WiFi, on the other hand, seems to be the controller of the stove itself, in other rooms it may be different with the temperature than in the one with ST2801 (e.g. living room / hall). Apparently EVO OT has limited possibilities to control the furnace itself? What does this mean exactly? It is a pity to pay extra for the OT version as it will work as On / Off :(
    Apparently, measuring the temperature with the head is a bad idea (this is the case with EVO), in TECH WiFi 8S it is more accurate for the radiator, the actuator / ki + sensor for the zone, somewhere far in the room, but it's a typical on / off.

    Or maybe none of the above, and use Termet's "Comfort System"?

    I'm already confused about what to choose ...
  • #146 18881273
    maliniak80
    Level 17  
    The posts show that in st-2801 you can add wireless temperature sensors, so the location of the controller itself is not critical, I was tempted by gold plus myself, even though the date is from 2018, the controller has soft v15 so "it should work with the st-2802. The boiler a meeting in a box but it will be connected for days, I will report whether it works, but it will definitely turn out in the winter if it was a good purchase
  • #147 18881311
    lasekd
    Level 13  
    In the st-2801 you can definitely add a wireless temperature sensor because I have one connected myself
    Is it possible to add more of these sensors, I rather doubt it, although I did not go into it because in my case they were unnecessary so I will not give my head
  • #148 18881464
    maliniak80
    Level 17  
    From what I can see, they add such a c-mini sensor to drivers signed with the Tech logo, but they are still with the Termet logo and even more expensive and without additional c-mini, now I do not know if I did well when I ordered it with the Termet logo, maybe it was necessary to take Techa
  • #149 18881484
    lasekd
    Level 13  
    Maybe you won't get poor with these 8 nozzles :)
    I also bought a termet with the logo and then had to invest in a sensor
    By the way, this sensor is more accurate than the one built into the controller
  • #150 18881603
    maliniak80
    Level 17  
    :) And so the boiler with the controller comes out cheaper than, for example, Buderus or brotje. It is important that he smokes little and does not act too often
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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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