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Vaillant EcoTEC Plus F27 Error: Flame Sensor Issues & Troubleshooting (VC PL306/3-5)

Piter.Krr 35820 48
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  • #32 20554599
    Jabbi
    Level 5  
    Thank you very much. I pry the black cover from the bottom near the plate and it doesn't go up. I apologize for perhaps a naive question, but should I pull the cables from above, i.e. above the black cover - the cables should come out of the cover and it should remain, or maybe the cover comes out with the cable?
    Vaillant EcoTEC Plus F27 Error: Flame Sensor Issues & Troubleshooting (VC PL306/3-5)
  • #33 20554601
    Adewag
    Level 21  
    I pulled the cable and the plug hard at the same time. There is a hole for the "tab" and it locks.
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  • #34 20554628
    Jabbi
    Level 5  
    I'll try it soon. So the cable came out with a black plug?
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  • #36 20554692
    Jabbi
    Level 5  
    Thank you for the info. I grabbed the pliers for the plug and it came out without a problem. Is it possible that this large 400 capacitor is 3-leg?
    Vaillant EcoTEC Plus F27 Error: Flame Sensor Issues & Troubleshooting (VC PL306/3-5)
  • #37 20554823
    Adewag
    Level 21  
    That's what you see in the photo. Twice the mass.
  • #38 20555545
    Jabbi
    Level 5  
    So one with 3 legs, so a bit different than what was written before? Do you know why I have another?
  • #39 20555745
    Adewag
    Level 21  
    It doesn't matter, it's the capacitance and voltage that count.
  • #40 20556925
    Jabbi
    Level 5  
    Successful boiler fixed error disappeared. Cost PLN 2.70 for two smaller twin capacitors that had to be desoldered by inserting new ones. The big one turned out to be functional and stayed in place. Thanks to everyone who posted in this thread, it was worth a try.
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  • #41 20556931
    rnb_bolii
    Level 39  
    What capacitors? Can you pass?
    C9 and C5?
  • #42 20557245
    Adewag
    Level 21  
    Capacitors C9 and C5 are the main cause of faults on this board, 220 micro at 35 V.
  • #43 20566979
    adobek
    Level 1  
    >>20556925
    Thanks. Just turned on my boiler after replacing two 470 uF capacitors. Works.
  • #44 20574975
    wingerman
    Level 11  
    These 420uf microfarad capacitors are for what voltage?
  • #46 20575880
    wingerman
    Level 11  
    Thank you very much my friend.
  • #47 20765203
    sosna2
    Level 2  

    Hello cordially :) I would like to thank the esteemed forum members very much for their help. Vaillant ecoTEC plus PL 246/3-5 R3 boiler, as in the topic - F.27 error popped up, resetting several times did not help, the boiler would start up but after trying to fire the flame immediately the error popped up. Cleaning the electrode did not help. I know nothing about electronics, but emboldened by esteemed colleagues I disassembled the plastics and got to the motherboard, purchased 2 small capacitors located on the board at the bottom left (in my case 470 uF, 35V), soldered them without disconnecting the cables - just the board itself I released from the hooks and lifted up so that there was access from below to approach the soldering iron (well, the wife helped) and the boiler came to life!!!! once again many thanks :) )))
    ps. cost of capacitors 2 zl.
  • #48 21433697
    EkoGrzew
    Level 20  
    Hello, I am reviving the topic.
    In my case at the service, the boiler after opening the chamber has not been cleaned for probably 8 years...
    so first cleaning and maintenance. . then checking the coils on the gas valve. Tomorrow I'll check the capacitors suggested here. I'd have to check the connections as it's clearly a lack of voltage at the spark generator.
    i attach the board symbol
    Close-up of a circuit board in a device with visible wires and electronic components. .
  • #49 21434896
    EkoGrzew
    Level 20  
    The boiler will live. The two capacitors mentioned here on the test are good, but after measuring one 100 ηF above nominal value and the other 100 ηF below nominal value. Replaced. Also checked other paths, soldered capacitor, cleaned, .
    After fitting everything, the boiler returned to operation.
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Topic summary

The discussion revolves around the F27 error code encountered in the Vaillant EcoTEC Plus VC PL306/3-5 boiler, indicating a faulty flame sensor or foreign light source interference. The original poster attempted several troubleshooting steps, including drying the electronics, cleaning ignition electrodes, and checking the gas solenoid valve. Responses from other users suggested that the issue might stem from wet electronics, a defective electronic board, or impurities in the combustion chamber. Common solutions included cleaning the electrodes to a metallic sheen, replacing electrolytic capacitors on the motherboard, and ensuring proper gas valve operation. Users reported success after replacing capacitors, particularly those rated at 470uF and 220uF, and emphasized the importance of checking connections and cleaning contacts. The thread highlights the need for careful inspection and potential component replacement to resolve the F27 error effectively.
Summary generated by the language model.
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