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[Solved] JUNKERS C6 Error: Pressure Switch Issues & Chimney Duct Influence on Turbo Stove Performance

Dawid_20 50166 11
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 11750799
    Dawid_20
    Level 17  
    Hello, this heating season I have a problem with error C6 (turbo stove). I know it's a pressure switch, it doesn't draw enough air. There is no rule for this error, one day everything is ok, another crashes every now and then on CW and CO. Once in the morning there are problems, and in the afternoon ok.
    I sketched what my chimney duct looks like

    JUNKERS C6 Error: Pressure Switch Issues & Chimney Duct Influence on Turbo Stove Performance

    I'm afraid that the suction pipe unnecessarily ends right in the brick chimney. Now I thought that maybe I could try to raise the protective roof over the chimney a little, but I'm away from home so I won't do it for now.

    There was a service technician (unfortunately there is only one in the area), he removed the furnace casing, blew into the hose and that's it, the problem repeated. He advised me to unscrew the caps on the top of the stove, but I think the guy talks nonsense. Of course, it would probably help, but the stove would no longer be with a closed combustion chamber, that's not the point.

    Press him to replace the pressure switch, or look for the cause in something else?

    Last winter it was ok.
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  • #2 11750891
    W0jtek92
    Level 38  
    The fact that the boiler is unsealed does not have a closed combustion chamber. But even so, it stays safe because the fan will still throw exhaust fumes up the chimney. For an experiment, I would depressurize the boiler and wait for some time. If the error persists, you can think about replacing the pressure switch.
    Regards
  • #3 11751352
    serwisszulborski.pl
    Heating systems specialist
    If it is under warranty, ask the service technician to replace the pressure switch. It is also worth cleaning the venturi tube in the fan, possibly replacing it from plastic with aluminum. Measure the negative pressure according to the instructions supplied with the device, then check the chimney with a flue gas analyzer. After the warranty, replace the pressure switch with a lower activation threshold....
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  • #4 11752271
    irus.m
    Heating systems specialist
    He, he. I'm laughing at myself.
    A few days ago I had a similar problem in Wiesiek 100.
    I have checked everything that knowledge, experience and common sense dictates. I even looked into the chimney with a mirror - there was a clearing to the sky. I got stupid and almost gave up, but something touched me. I looked into the basement, there someone had taken the flaps from the cleaning holes of all chimney ducts! After plugging the chimney, the boiler started like new, and only then the owner told me that it had been like this for half a year and I was the fourth in a row.
    It was a good day, I jumped seven more neighbors.
    So often the reason for the poor operation of the boilers are mundane reasons, and people make extra money for this hugely developed theories.
    best regards
  • #5 11752342
    Dawid_20
    Level 17  
    It is a one-story apartment, there is no basement and the chimney ends in the room where the stove is located and downstairs in the cleaning room everything is clogged.
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  • #6 11752384
    irus.m
    Heating systems specialist
    OKAY.
    I didn't mean to diagnose you remotely. I just told about what happened to me in a similar topic. If you solve the problem, let us know in the forum. I am curious as to what is causing this.
    best regards
  • #7 11752421
    Dawid_20
    Level 17  
    I understand :) There are different cases and reasons and I'm glad to hear different hints from experienced people. I'll let you know for sure.
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  • #8 11770203
    Dawid_20
    Level 17  
    On Tuesday, I unsealed the stove by unscrewing the flap that the service technician was talking about. Yesterday the stove blew again C6 and turned on only this afternoon. On Saturday, the service technician will change the pressure switch.
  • #9 11997837
    ka_michal
    Level 9  
    Hello

    I also have a C6 error in Junkers Cerapur Smart ZSB-22C since yesterday. The service technician says that the fan needs to be replaced. The cost is PLN 910 + labor, the whole thing is about PLN 1100 ... Damn, is that the only advice?
    The boiler has been working normally for over 3 years so far, serviced every year, such an error popped up completely suddenly.
    Can I suggest him to check something else? But what ? Mentioned this pressure switch here in the thread, or something else?
    The boiler, when turned on, hums only with the circulation pump for about 6 seconds, then it starts clicking contactors / switches and displays C6 ...

    thanks in advance for any info

    Regards, Michal
  • #10 11999578
    serwisszulborski.pl
    Heating systems specialist
    Unfortunately, there is no exhaust gas pressure switch in the ZSB22-3C. Probably the fault is on the fan electronics side. If the board is operational and supplies voltage to the fan and it does not move, then the service technician's diagnosis is correct.
  • #11 12000002
    ka_michal
    Level 9  
    serwisszulborski.pl wrote:
    Unfortunately, there is no exhaust gas pressure switch in the ZSB22-3C. Probably the fault is on the fan electronics side. If the board is operational and supplies voltage to the fan and it does not move, then the service technician's diagnosis is correct.


    The fan has been replaced, the furnace works flawlessly.
    Heating costs in the season increased by PLN 1,000 :(

    Regards, Michal

    P.S. Announcement - defective fan for sale ;)
  • #12 16109113
    klonas
    Level 12  
    I don't want to start a new thread. I have a junkers turbo stove. I once had problems with the C6 error, a service technician came and did something and it does not appear anymore. I feel fumes in the bathroom, something is not tight, I look inside and there are two hoses. One black is loose, not connected to the stud. When I connect it, it's C6. What did the service guy disconnect it from?

    What could be causing the smell of exhaust fumes? can it fly through these screws securing the exhaust outlet to the stove? (professionally screwed)

    Earlier, the furnace outlet was leaky, I sealed it. I'd rather not see these professionals again. Do it yourself or know what to worry about...

    Maybe he just disconnected my pressure switch? what is it actually used for?

Topic summary

The discussion revolves around the C6 error in Junkers turbo stoves, specifically related to pressure switch issues and the influence of chimney duct design on performance. Users report intermittent C6 errors, often linked to inadequate air draw due to chimney blockages or improper installation. Suggestions include checking and cleaning the venturi tube, replacing the pressure switch, and ensuring proper chimney ventilation. One user shared a personal experience where a blocked chimney cleaning flap caused similar issues. Another user faced a C6 error in a Junkers Cerapur Smart ZSB-22C, leading to a diagnosis of fan failure. The conversation highlights the importance of thorough diagnostics and the potential for mundane issues to cause significant operational problems.
Summary generated by the language model.
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