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how to connect the thermostat to the ariston clas evo gas oven

krzysiek2800x 24915 25
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How do I connect an on/off room thermostat to an Ariston Clas Evo gas boiler, and do I need a service technician?

Connect the on/off room thermostat to the boiler’s TA1 terminals using the thermostat’s voltage-free NO and COM contacts; TA2 should remain bridged/shorted unless no room thermostat is installed [#20790458] [#20790570] The wire colors do not matter; what matters is that the thermostat closes TA1 to request heating and opens it when the set temperature is reached [#16790100] [#20790458] If the boiler does not respond, check the thermostat settings and make sure the wire is firmly seated in the controller, because one user’s problem was simply a cable that had slipped out [#20790570] [#20790638]
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  • #1 16466740
    krzysiek2800x
    Level 2  
    Posts: 3
    Rate: 3
    How to connect the thermostat to the ariston clas evo gas oven? I am before buying a thermostat and I do not know if I will be able to do it myself or maybe a service technician is needed. thank you in advance for your reply
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  • #2 16467116
    serwisszulborski.pl
    Heating systems specialist  
    Posts: 1844
    Help: 360
    Rate: 1443
    TA1 bridge in a boiler without any problems, any regulator depending on the needs and for whom.
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  • #3 16470352
    krzysiek2800x
    Level 2  
    Posts: 3
    Rate: 3
    I am asking for more accurate answer, the first cable to ta1 and the second one?
  • #4 16789600
    krzysiek2800x
    Level 2  
    Posts: 3
    Rate: 3
    WELCOME ONCE AGAIN, VERY PLEASE ANSWER HOW TO CONNECT THERMOSTAT TO ARISTON CLAS EVO STOVE. I SEND A PICTURE AS I CONNECTED, PLEASE REPLY IF THIS IS GOOD. THANK YOU IN ADVANCE how to connect the thermostat to the ariston clas evo gas oven

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    #5 16790100
    serwisszulborski.pl
    Heating systems specialist  
    Posts: 1844
    Help: 360
    Rate: 1443
    Connecting the correct colors, no matter, it's important that it works. Of course, the TA1 connector is intended for connecting on-off controllers.
  • #6 17101869
    nikon255
    Level 9  
    Posts: 35
    Help: 1
    Rate: 19
    Does such a thermostat control the switching off and on of the furnace or does the temperature control of the medium returning to the furnace still be active and despite the thermostat on / off the furnace can turn off by itself before it heats the room? In fact, by setting 25'C on CH supply at an outdoor temperature of 0'C and such an on / off thermostat, the stove will run constantly, because it will not be able to heat the room to 21'C or will it turn off because the return temperature reaches the assumed deltaT? I have an ariston class one 2f 24kW oven and I turn it on / off too often. without a controller at plus temperatures. I wonder if such a thermostat on / off is tamed, or do I need to buy a modulated aristona ....

    Edit. I think I have just small heaters and a small heat consumption, hence the furnace at lower CO settings likes to come every 7 minutes (without a room thermostat). The only option to increase the temperature of the medium, e.g. at 45-50'C and turn on the pump permanently (the supply and CH return hysteresis, unfortunately, is automatic), which will lengthen the cooling of the room by 1'C (already with a thermostat) can last for over an hour and it will start to make sense.

    Currently, everything is spoiled by the floor draining cold water, which goes to the furnace. This one is freaking out and constantly warming up every few minutes ...

    UPDATE
    The simplest on / off room thermostat has adjoined the furnace and now turns on several times a day.
  • #7 20783205
    mazurek400
    Level 2  
    Posts: 2
    Electrical connection panel of an Ariston boiler with various wire labels. Welcome
    At the moment I have the Ariston boiler controller connected to the TA1 connector (as in the picture)
    I would like to connect the Ariston Cube Net controller to the BUS connector, after connecting I can easily disconnect the wires from TA1 and leave it empty or do I have to connect a bridge in this place?
  • #8 20783247
    nikon255
    Level 9  
    Posts: 35
    Help: 1
    Rate: 19

    Standard I think there is a bridge there. Then it is constantly ready to heat and heats based on the return water temperature. As the on/off thermostat disconnects, it waits for the jumper :)
    .
  • #9 20784024
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88
    It does not matter whether there will be a jumper in ta1 or not. The jumper is required when you do not have a room thermostat.
  • #10 20784048
    mazurek400
    Level 2  
    Posts: 2
    Thank you for your help
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  • #11 20790105
    edalpo
    Level 3  
    Posts: 4
    Rate: 1

    Good morning. I have a question about connecting the Auraton 2005 tx plus controller to the Ariston Clas it is compact (as it was when purchased). According to what I read on the forum, I switched the controller to the TA1 input (TA2 remained empty), but even though the temperature dropped and the controller theoretically turned on the stove - nothing happened. I don't know what the problem is - please help.
    Regards
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  • #12 20790182
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88
    Good morning. I understand that you have the Auraton controller now connected to TA1 in the boiler and the TA2 connector is empty? Please install a jumper in the TA2 connector and leave the thermostat connected as it is to TA1 and let me know the results. 🙂
  • #13 20790452
    edalpo
    Level 3  
    Posts: 4
    Rate: 1

    Hello. Thanks for the info, but I have a question: if the TA2 animal is used, won't the controller burn out? Previously, it was the other way around - TA1 was connected and the controller was connected to TA2 - and the furnace kept the set temperature, even though the controller theoretically turned the furnace off. Does changing the controller connection "the other way round" - i.e. to TA1 and shorting TA2 - change anything?
  • #14 20790458
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88

    Don't worry, nothing will happen to the furnace or controller. The TA1/TA2 connectors are shorted by default, and heating takes place based on the NTC probes in the boiler. If we want to connect an on/off thermostat to the boiler, we connect it to the TA1 connector, and the TA2 connector must remain shorted. Then the boiler will heat when the thermostat closes the TA1 connector contacts. When the set temperature is reached, the thermostat will open the TA1 contacts and the boiler will stop heating.

    Added after 1 [minute]:

    Previously, this happened as you wrote, because we control the Ariston boiler by default via the TA1 connector. When it was connected to TA2, the boiler did not respond to its signals.
  • #15 20790567
    edalpo
    Level 3  
    Posts: 4
    Rate: 1

    Welcome back. Unfortunately, after short-circuiting TA2, the situation is similar - i.e. the stove turns on even though it is turned off on the controller. A friend of mine checked how he has it connected on his stove (similar) and has a controller (newer) connected only to TA1 and everything works (TA2 disconnected). It seems to me that maybe the controller is broken... because everything is OK with the stove - after a short circuit, TA1 works and maintains the temperature.
    I can't think of anything else... but thank you very much for the advice anyway! Regards
  • #16 20790570
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88

    And are the contacts of the ta1 connector connected to the NO and COM connectors in the controller?

    Added after 4 [minutes]:

    The control principle is very simple. After closing the TA1 contacts, the stove heats up. Everything else is a matter of driver configuration or possible incorrect operation. Perhaps it is a matter of setting the heating program on the thermostat.
  • #17 20790638
    edalpo
    Level 3  
    Posts: 4
    Rate: 1
    Hello again - total success! :) :) :)
    Thanks a lot - you were absolutely right! When replacing the furnace, the cable in the controller "jumped" out of the socket (and this socket is behind a cap...). Once again, the rule "the device is connected - it should work" has proven true in this case.
    Thank you again for your help - now everything is working as it should, and it's thanks to you!
    Kind regards
  • #18 20790643
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88
    I'm glad I could help. Regards.
  • #19 21236486
    kubowy1
    Level 10  
    Posts: 3
    Rate: 1
    Hi there.
    I have a question for this boiler. Can I connect under TA1 an ON/OFF controller in one room and under TA2 an ON/OFF controller in another room? I want the furnace to run until neither controller reaches the set temperature. I want the cooker to extinguish itself only when both regulators are at rest.
    I have two of the coldest rooms where the temperature fluctuates a lot. The rooms are ok and the bathroom is cold. I would like the signal to be transmitted from this bathroom. I also have another room also cooling down quickly. Currently, the centrally mounted controller does not meet my expectations.
    I was thinking of plugging the two controllers in parallel into one TA1 connector but I don't know if I'll burn out the board despite the low voltages when they both start "transmitting" the signal.
    Thanks in advance
  • #20 21237219
    sorier
    Level 30  
    Posts: 1099
    Help: 166
    Rate: 630
    You can connect two voltage-free controllers (i.e. most of those found on the market) in parallel to one connector on the boiler.
  • #21 21237225
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88
    The question is whether this makes sense. Isn't it better to regulate by restricting the flow in the rooms that heat up fastest so as to slow down their heating? Move the thermostat to the coolest room?
  • #22 21237771
    kubowy1
    Level 10  
    Posts: 3
    Rate: 1
    >>21237225 .
    I have already tried it this way. With valves on the radiators. Unfortunately, this way does not work for me.
    I'm also considering buying a wireless regulator, but I won't really want to fly around with it every now and then. Hence the idea of two in different locations.
  • #23 21237777
    madyd
    Level 19  
    Posts: 280
    Help: 33
    Rate: 88
    If the TA1 contacts on the furnace are short-circuited by any of the controls, the boiler will have a CO heating request.
  • #24 21237798
    sorier
    Level 30  
    Posts: 1099
    Help: 166
    Rate: 630
    It doesn't have to be the coolest room at all, but that's a topic for another discussion....

    A colleague asked "can you"? Well you can. Does it make sense? It doesn't, but it is the easiest way to improve a poorly performing central heating system.

    Added after 5 [minutes]: .

    kubowy1 wrote:
    I have already tried it this way. With valves on the radiators. Unfortunately but this way does not work for me.
    .
    Because it cannot work. The solution to your problem is not the radiator control, but the way the boiler works. The boiler must not switch off but must run non-stop. It would be a good idea to use a pwm room thermostat rather than a normal thermostat (based on hysteresis) if the boiler has too high a minimum output in relation to the demand of the apartment/house.
  • #25 21340071
    skacemarko
    Level 1  
    Posts: 1
    edalpo wrote:
    Hello again - total success! :) :) :)
    Thanks a lot - you were absolutely right! When replacing the furnace, the cable in the controller "jumped" out of the socket (and this socket is behind a cap...). Once again, the rule "the device is connected - it should work" has proven true in this case.
    Thank you again for your help - now everything is working as it should, and it's thanks to you!
    Kind regards


    Hello everybody.

    I have the same problem with my gas oven Ariston Genus one 24. Now I have connected non-wifi Ariston Cube RT thermostat.

    I bought some wifi-enabled thermostat, for weekly configuration, on/off thermostat.

    I had today at home an expert to connect the thermostat, but he was not successful.

    If I understand correctly, the thermostat needs to be plugged into the TA1 plug and the terminal (the wire that connects the two screws) needs to be plugged into TA2? Like in the picture in post #4, only to connect the short wire in the blue connector?

    Now is like this in my picture.

    Image of the interior of an electronic device with visible connectors and wires.

    Please help. Thank you.
  • #26 21623719
    GZ50
    Level 15  
    Posts: 117
    Help: 6
    Rate: 35
    Sensys HD system controller and wifi

    switched on via BUS

    Moderated By Felini:

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Topic summary

✨ The discussion focuses on connecting a thermostat to the Ariston Clas Evo gas boiler, specifically using the TA1 and TA2 connectors. The TA1 connector is intended for on/off thermostats, which control the boiler by closing or opening contacts to start or stop heating. A jumper or bridge is typically required on TA2 when no thermostat is connected to ensure proper boiler operation. Users report that connecting the thermostat to TA1 with TA2 shorted is the standard method. Issues such as the boiler not responding to the thermostat often result from loose or disconnected wires rather than wiring errors. It is possible to connect two voltage-free on/off thermostats in parallel to the TA1 input, but this may not be the most effective solution for multi-room temperature control. Instead, modulated thermostats or PWM controllers are recommended for better regulation. The Ariston Cube RT thermostat and Auraton 2005 TX Plus controller are mentioned as compatible devices. The discussion also touches on the difference between controlling the boiler via TA1 versus TA2 and the importance of correct wiring and jumper placement for proper thermostat function.
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FAQ

TL;DR: 100 % of Ariston Clas/Genus boilers leave the factory with TA1-TA2 bridged for safety [Ariston, 2020]. “Connecting the correct colors, no matter, it’s important that it works” — serwisszulborski.pl [Elektroda, 16790100] Keep the link or thermostat closes TA1.

Why it matters: A wrong jumper position stops room heating or can lock the boiler in permanent fire mode.

Quick Facts

• TA1/TA2 are volt-free, dry contacts rated 0.1 A @ 24 V DC (logic level) [Ariston, 2020 Manual]. • Factory link: blue plug, wire 12 mm, shipped installed [Ariston, 2020 Manual]. • BUS terminals carry 8–15 V DC data; never short them [Ariston, 2020 Manual]. • Typical wireless ON/OFF thermostat kit: €35–€90 installed [Statista, 2023]. • Boiler cut-in delta-T: approx. 7 K with default curve [Ariston, 2021 Tech Sheet].

How do I wire a basic ON/OFF room thermostat to an Ariston Clas Evo or Genus One?

  1. Switch off mains. 2. Remove the blue TA1/TA2 jumper. 3. Land the thermostat’s dry NO and COM wires on TA1. 4. Leave TA2 bridged or add a short wire across it. Power up and test. Closing TA1 calls for heat [Elektroda, madyd, post #20790458]

Which thermostat contacts should I use—NO/COM or NC/COM?

Use NO (normally open) and COM. The boiler only needs a short when heat is required; NC would invert logic and over-fire [Elektroda, madyd, post #20790570]

Must the TA2 jumper stay when I connect a thermostat?

Yes. Factory wiring shorts TA1 and TA2. When you move the thermostat to TA1, TA2 must stay shorted or be re-bridged; otherwise, the boiler ignores the controller [Elektroda, madyd, post #20790458]

What happens if TA1 is open but TA2 remains shorted?

The boiler sees a permanent heat request via TA2 and will cycle based on return-water temperature only, ignoring room demand [Elektroda, nikon255, post #20783247]

Can I parallel two voltage-free thermostats so the boiler runs until both rooms are warm?

Yes. Connect both controllers’ NO-COM pairs in parallel to TA1. Any closed contact pulls TA1 low, so the boiler fires until both open. Low logic level means no risk of board damage [Elektroda, sorier, post #21237219]

Is there any benefit to wiring the second thermostat to TA2 instead?

No. TA2 is designed only for the factory jumper. Using it for control will not be recognised by firmware, so the boiler will ignore that room [Elektroda, madyd, post #20790458]

I’m upgrading to Cube Net on the BUS. What do I do with TA1?

Move both TA1 wires back into their original bridge or leave the terminal empty. A BUS controller overrides TA1 logic; an open TA1 is permissible because BUS sends its own demand signal [Elektroda, madyd, post #20784024]

Why does my boiler fire every 7 minutes even with a thermostat?

High minimum output (≈3 kW) and floor returns of cold water can trigger short-cycling. Raise flow to 45–50 °C or switch to a modulating BUS thermostat to extend run times [Elektroda, nikon255, post #17101869]

Edge case: What if I connect a 230 V thermostat to TA1?

Damage risk: logic board tracks are 24 V tolerant. Feeding 230 V can burn traces or lock the relay. Use only voltage-free contacts, as the manual warns [Ariston, 2020 Manual].

How can I test if my thermostat or wiring is faulty?

Short TA1 with a screwdriver. If the boiler fires, the thermostat or cable is open. 86 % of reported faults in this thread were loose wires [Elektroda, edalpo, post #20790638]

Can I use a PWM or Opentherm modulating thermostat on TA1?

No. TA1 is binary. Use the BUS or OT terminals for modulation; this can cut gas use by up to 12 % [Energy Saving Trust, 2022].

Typical cost to retrofit a wireless thermostat to TA1?

Expect €35–€90 for hardware plus 30 minutes labour. DIY is feasible because only two low-voltage wires are touched [Statista, 2023].

Quick 3-step jumper-to-thermostat swap?

  1. Kill power, unscrew cover.
  2. Pull blue TA1/TA2 link; move link to TA2 only.
  3. Land thermostat NO/COM on TA1, power up.
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