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EOLO Star 24 3 E Gas Oven - Error 11: Exhaust Pressure Switch Issue, Open White Lid Solution

omaxp 39285 11
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  • #1 16790736
    omaxp
    Level 10  
    Hello everyone in this forum, I am looking for the answer to my question.

    My furnace is EOLO Star 24 3 E, for some time error 11 (exhaust pressure switch) has been constantly popping up.
    At the top of the boiler there is a white lid visible in the picture and now when I unscrew it, the error is not shown to me, you can only hear it draws air and the stove works properly without any errors.

    Please tell me can this flip be open ?? The heating season is starting and I would not like to fly through this open flap. :cry: :cry:
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    • EOLO Star 24 3 E Gas Oven - Error 11: Exhaust Pressure Switch Issue, Open White Lid Solution 20171030_234551 (Small).jpg (44.03 KB) You must be logged in to download this attachment.
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  • Helpful post
    #2 16791369
    Piotr2608

    Level 41  
    If you don't want to fly into the air, call someone who will repair the furnace and fix it for you.
    Not enough people have died from the silent killer called carbon monoxide.
    This cap should be screwed on. You can already guess that there is a lack of air in the room.
    All grilles work? Chimney sweep review was? If so, call an oven specialist.
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
  • #3 16791551
    omaxp
    Level 10  
    Thank you for the answer, you probably saved me, I closed the cap today and error 11 came back.

    The chimney sweep was and told me that I still have a grille, but I have to make holes in the door. I didn't cover the holes because it probably won't fix my oven.

    My stove is in a very small bathroom and is 5 years old and serviced.

    I read that there may be a blocked air intake or this prosestat is broken, can I do something myself today to fix it without calling for a gas supply ??
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  • #4 16793106
    irus.m
    Heating systems specialist  
    Eolo is a boiler with a closed turbo chamber. The combustion air is drawn in from the outside by an air / flue pipe, so room ventilation has nothing to do with it.

    Check the flue pipe for any bird or other debris. Same with the air intake. and tightness of these wires.
    If everything is unobstructed, check the switching pressure of the pressure switch - I have never happened to fail in this model, but who knows?
    It happened that the fan motor lost its parameters and gave too low pressure, which resulted in the operation of the pressure switch.
    best regards
  • #5 16793108
    kasprzyk
    Electrician specialist  
    When was the last boiler inspection / cleaning?
    You may have a problem with the chimney, fan (lack of efficiency, dirty orifice), the last one can be a pressure switch.
    Maybe it will end up cleaning the fan itself, but if you have no experience in this, order it to the right person / company, especially since you will not write the protocol yourself, unless you have gas permissions?
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  • #6 16802818
    omaxp
    Level 10  
    Gentlemen, I made an appointment with the gas supplier and let me know what the problem was.
  • #7 16802979
    kasprzyk
    Electrician specialist  
    It is better if you have an appointment with a boiler serviceman, may "gasworks" mean the same to you ;)
  • #8 16945971
    tomlom
    Level 11  
    Hello. And what was the reason? I have the same problem
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  • #9 16961037
    omaxp
    Level 10  
    Gazownik said that the flue gas pressure switch was to be replaced, so I ordered it and I am waiting for it to be installed. I'll let you know if it helped
  • #10 17267860
    omaxp
    Level 10  
    Replacement of the exhaust pressure switch helped and the furnace runs without error 11
  • #11 19979142
    piotrswietrecki
    Level 1  
    How much did this action cost?
  • #12 19979162
    omaxp
    Level 10  
    For those times, PLN 200 + PLN 100 for the job,
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Topic summary

✨ The EOLO Star 24 3 E gas oven is experiencing Error 11, indicating an exhaust pressure switch issue. The user noted that removing a white lid temporarily resolves the error, but concerns about safety arise due to potential carbon monoxide risks. Responses suggest checking the flue pipe and air intake for blockages, ensuring proper ventilation, and considering the condition of the fan motor and pressure switch. A gas technician was consulted, leading to the diagnosis that the exhaust pressure switch needed replacement, which ultimately resolved the issue. The cost for the replacement and service was approximately PLN 300.
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FAQ

TL;DR: In this thread, 1/1 cases of EOLO Star 24 3 E “Error 11” were fixed by replacing the exhaust pressure switch; “Replacement of the exhaust pressure switch helped.” [Elektroda, omaxp, post #17267860]

Why it matters: It prevents unsafe workarounds like opening the top lid and restores safe, reliable heating for owners facing Error 11.

Quick Facts

What does Error 11 mean on an EOLO Star 24 3 E gas boiler?

Error 11 indicates a fault on the exhaust/airflow pressure switch circuit. The owner observed the fault repeating. It cleared only when the top white lid was opened, which is unsafe. The code flags inadequate airflow or a switch-related issue that prevents safe ignition. Keep the lid closed and investigate the flue/air path and the switch. [Elektroda, omaxp, post #16790736]

Is it safe to run the boiler with the white top lid open?

No. “This cap should be screwed on.” Running with the lid open risks unsafe combustion and carbon monoxide exposure. A forum expert warned against this and advised calling a qualified technician to repair the boiler. Treat any bypass as hazardous and stop using the boiler until fixed. [Elektroda, Piotr2608, post #16791369]

Does room ventilation or door grilles affect this model’s Error 11?

This EOLO is a closed-chamber, turbo boiler. It takes combustion air from outside via the concentric flue system. Room grilles and bathroom airflow do not drive combustion here. Focus checks on the outdoor air intake and the flue path instead of indoor vents. “Eolo is a boiler with a closed turbo chamber.” [Elektroda, irus.m, post #16793106]

What usually causes Error 11 on this boiler?

Typical culprits: blocked flue or outdoor air intake, leakage in the coaxial ducts, weak fan pressure, or a misadjusted or failed pressure switch. Start by confirming the flue and intake are clear and the system is airtight. If clear, test the switch and fan performance next. [Elektroda, irus.m, post #16793106]

What fixed the issue for the original poster?

Replacing the exhaust pressure switch resolved the fault. The boiler then ran without Error 11. As the owner reported: “Replacement of the exhaust pressure switch helped.” This directly links the remedy to restored operation in that case. [Elektroda, omaxp, post #17267860]

How much did the pressure switch repair cost in the thread?

The reported spend was PLN 200 for the pressure switch and PLN 100 for labor. Use this as a historical benchmark; local prices vary. The cost reference came later from the same owner who confirmed the fix. [Elektroda, omaxp, post #19979162]

Can I do anything myself before calling service?

Yes, basic non-invasive checks only: 1) Inspect the outdoor air intake and flue terminal for obstructions or debris. 2) Check visible flue joints for looseness or damage. 3) Restore the top cap and do not run with it open. If faults persist, call a technician. [Elektroda, irus.m, post #16793106]

Could a weak or failing fan trigger Error 11?

Yes. A degraded fan can produce insufficient differential pressure, preventing the pressure switch from changing state. An experienced member noted fan motors can lose parameters over time, triggering the fault path. A technician can test fan speed and pressure. [Elektroda, irus.m, post #16793106]

Should I add bathroom door vents or grilles to fix Error 11?

No, not for this model’s combustion. The EOLO draws air from outside, so indoor bathroom vents do not resolve a combustion-air Error 11. Focus on the concentric flue and air intake condition and component testing. [Elektroda, irus.m, post #16793106]

What is the exhaust pressure switch (presostat) on this boiler?

It is a safety sensor that verifies fan-driven airflow through the sealed combustion path. If it does not switch, ignition is blocked. In this thread, replacing it restored normal operation, confirming it as the failed part. “Replacement of the exhaust pressure switch helped.” [Elektroda, omaxp, post #17267860]

How old was the boiler when the problem appeared? Does age matter?

The owner reported the boiler was 5 years old and serviced. Faults can still emerge due to wear, debris, or component drift. Age is one factor, but diagnostics must verify airflow, fan, and the pressure switch. This case shows mid-life failures can occur. [Elektroda, omaxp, post #16791551]

Who should I call—gas utility or a boiler service technician?

Call a qualified boiler service technician. A member clarified that an appointment with a boiler serviceman is the appropriate route for this issue, not the gas utility. You need appliance-specific diagnostics and parts. [Elektroda, kasprzyk, post #16802979]

What happens if I ignore Error 11 or keep resetting it?

The boiler will continue to lock out to protect you. Forcing operation by opening the cap introduces serious safety risks, including carbon monoxide. Keep the cap installed and stop using workarounds. “This cap should be screwed on.” [Elektroda, Piotr2608, post #16791369]

How does a technician verify the pressure switch?

They measure the switch’s changeover pressure while the fan runs, compare to spec, and check tubing integrity. One expert noted failures are uncommon for this model, so they also assess fan performance and flue blockage during testing. [Elektroda, irus.m, post #16793106]
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