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Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing Parts

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  • #91 21339453
    roimort
    Level 3  
    >>21339419
    Thank you for your fast answer. Next day I'll try to replace it. I found 15µF 50V. I hope this will work.
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  • #92 21344928
    tomcio1199
    Level 14  
    roimort wrote:
    >>21307114 .
    Hi, after 3 weeks I have a 311.5P6 again. So do I need to replace the Omron relay again? What is wrong with these parts? Could someone send me a different type of manufacturer part? Panasonic maybe? I don't know what to do next...
    .
    With me "twu twu" not to jinx it so far everything is working. Well I bought a panasonic with the same parameters, and I checked the capacitors and they had their values, so I did not move them, but check the capacitors and those resistors near the relay and those PCB regulators.... As for the parameters, I wouldn't give more than 10uF, at most for higher voltage, e.g. 50V
  • #93 21346909
    danielkol91
    Level 10  
    Hello, I have a Genus One cooker and it is driving me crazy with the 5p3 error. The motherboard shows that the version has been improved but? I don't think this improvement does anything. There are days that the error is not there and sometimes there are several times. I have also noticed that it happens when the cooker is cold.
    This is the board after the manufacturer's patch
    Close-up of a boiler's motherboard with electronic components and a CE label. .
    And this one before Close-up image of a Genus One boiler motherboard after manufacturer improvements. .


    What else do you think could be wrong? The cooker is two months old. I have checked the chimney several times.
  • #94 21352424
    tomcio1199
    Level 14  
    If it's 2 months old, call for service under warranty, and there's no point in messing about on your own, let them fiddle around and worry about it
  • #95 21354432
    jirislaby
    Level 8  
    jirislaby wrote:
    I am going to replace both of them with BD140-16. It has the same parameters except power dissipation: 1.3 W -> 12.5 W! It's not SMD, it's THT. And one can mount a piece of aluminum as a cooler on it easily too.


    So I switched from BCP53-16 to BD140-16 in September (as I had to replace BCP53-16 twice already). And mounted a piece of ALU "cooler" on it. The stove works nicely.

    Close-up of a circuit board featuring a modified BD140-16 transistor with an aluminum heatsink.
  • #97 21355438
    danielkol91
    Level 10  
    I agree that the gas valve plug area is very sensitive. Touching the board with a piece of plastic near the relay causes a 5p3 error. On my motherboard the relay was swaying a bit on the board. It was checked on the table and is ok, it has been re-soldered.

    Added after 2 [hours] 37 [minutes]: .

    I found one more interesting thing. This hob before the change in parameter 220 had 44 and this new one has 23. This is the burner start power parameter. I changed it to 44 because even in the manual it is written that this is a factory parameter. The only question is where did 23 come from? Did the boiler change it during auto-adaptation? Or maybe the internet connection is messing things up? I will test and let you know if anything has changed.
  • #98 21355843
    jirislaby
    Level 8  
    >>21355060
    I cannot see the attachments. If you can post there, you can perhaps link this forum as well?
  • #99 21356211
    BLANDEL
    Level 3  
    You must be registered on this site as a member to see the photos...
    Parameter 220 increases the power at startup and therefore the ionization current... If we increase it, the SP3 errors decrease but do not disappear! The problem is therefore elsewhere...
    In summary, what I understand:
    The errors occur more when cold, it is logical if the electrolytic capacitors are guilty: the ESR decreases and the capacity increases when the temperature rises, then we go beyond the critical threshold... The 100uF capacitor that discharges into the relay coil to make it stick, causes an error when it weakens (random sticking). It might be useful to replace this capacitor with a more robust tantalum! With this circuit, the gas valve closure is secured in the event of a problem but the capacitor is very stressed, and its aging is accelerated by the heat of the surrounding components. This may be the solution for a lasting repair...
  • #100 21356948
    datusan
    Level 4  
    Hello
    I've made that post on the Softpedia forum.
    I was partially mistaken, the situation was improved but not solved.
    Now after about 3 weeks and replacing the small capacitor previously mentioned here on the topic, I have come to the conclusion that the situation is not caused only by a defective part. Almost all the control circuits on the electronic board are monitored and compared by the processor. Since something does not correspond, the gas valve control is closed. Thus, any capacitor that does not correspond and creates spikes in its power supply will create flame detachment. In my case, those 1nf / 35v capacitors had an ESR of 7-10ohm.
    Now the boiler has not had any shutdowns. The error list still shows some misfires but they did not cause any shutdown.
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  • #101 21358201
    cmosgr
    Level 4  
    danielkol91 wrote:
    I agree that the gas valve plug area is very sensitive. Touching the board with a piece of plastic near the relay causes a 5p3 error. On my motherboard the relay was swaying a bit on the board. It was checked on the table and is ok, it has been re-soldered.

    Added after 2 [hours] 37 [minutes]: .

    I found one more interesting thing. This hob before the change in parameter 220 had 44 and this new one has 23. This is the burner start power parameter. I changed it to 44 because even in the manual it is written that this is a factory parameter. The only question is where did 23 come from? Did the boiler change it during auto-adaptation? Or maybe the internet connection is messing things up? I will test and let you know if anything has changed.


    No idea where that 23% came from but it's a totally wrong value on this boiler from my tests. You can go a bit lower or higher if you have a loud ignition but not that low.

    It doesn't change during auto-adaptation. If you reset settings (I don't remember where that option in the menu right now) it will reset to the factory one in the firmware so then you'll know if they have updated this setting or it's just came wrong.

    ps. newer genus models have 58% soft ignition power but don't go that high on our models it won't help at all. Also these newer models have a newer ignition system (I wonder why...)

    Added after 54 [minutes]:

    datusan wrote:
    Hello
    I've made that post on the Softpedia forum.
    I was partially mistaken, the situation was improved but not solved.
    Now after about 3 weeks and replacing the small capacitor previously mentioned here on the topic, I have come to the conclusion that the situation is not caused only by a defective part. Almost all the control circuits on the electronic board are monitored and compared by the processor. Since something does not correspond, the gas valve control is closed. Thus, any capacitor that does not correspond and creates spikes in its power supply will create flame detachment. In my case, those 1nf / 35v capacitors had an ESR of 7-10ohm.
    Now the boiler has not had any shutdowns. The error list still shows some misfires but they did not cause any shutdown.


    I do not have any shutdowns but I have loud ignitions sometimes. (flame lift error sometimes is logged mostly on hot domestic water).

    I think the valve is not opening on time and it's not synchronized with the spark resulting in loud ignition. Even newer boards still have issues after some time. Honestly they should make a recall on these models.

    Which capacitors are you referring to? (I cannot see the pictures on the other forum even logged-in)
  • #102 21358292
    datusan
    Level 4  
    I posted on this topic, it is the post with no. 21339419, on the previous page.
  • #103 21358856
    danielkol91
    Level 10  
    I have a 2024 boiler with a new header board Close-up of a boiler motherboard from 2024 with visible electronic components.

    Has anyone tried converting the old model to match this new one? Maybe this will improve its functioning. I think the disadvantage is also that the boiler modulates to almost 2.5 kW. So the flame may be too weak to trigger the correct voltage on the ionisation electrode? Apparently the Viessmann has a flame blowout protection when the burner is on low power
  • #104 21359221
    Sergey27
    Level 2  
    danielkol91 wrote:
    I think the disadvantage is also that the boiler modulates to almost 2.5Kw. So the flame may be too weak to trigger the correct voltage on the ionisation electrode?

    This is easy to check. The distance between the ignition electrodes should be 3 mm, between the electrode and the burner 5 mm. If the electrode is clean and in good condition, the minimum current for flame detection should be 1 mA. You can measure the current with a multimeter at a minimum flow rate of hot water.
    New boilers work properly for several years, which means the problem is in the components, the parameters of which can degrade over time, for example, due to overheating. On faulty boards, darkening of the textolite in the area of the gas valve transistors and resistors is clearly visible. Do you have grounding?
  • #105 21363874
    danielkol91
    Level 10  
    Not a single 5p3 error has popped up since 22.12 to date. I hope that changing parameter 2.2 from 23 to 44 has fixed this. I will test for longer and let you know. Motherboard after design change.
  • #106 21369179
    todoroffgg
    Level 1  
    Здравейте,
    Проблемите с моят Ariston Genus One 24kw, свързани с множество грешки 5p3, 5p6, 501 и най-много 504 през последните две седмици, намериха неочаквано и елементарно решение. Оказа се, че едно от двете съседни съпротивления от 15 ома е било лошо запоено и това се е отразило на работата му напоследък. При опит да бъде измерено този SMD елемент, то просто отхвръкна от мястото си. Презапояването беше piece of cace.
    Интересното е, че след комуникация с Аристон-България ми беше предложено да закупя нова PCB за 690 BGN = 350 евро!?), което е истинско безобразие. Търсенето на алтернативни решения ме доведоха до форума в този прекрасен сайт. Много, много Ви благодаря, научих доста неща от коментарите Ви.
    Котлето ми е на 4+ години. През гаранционния период му бяха подменени две PCB. Сега работи много, както и преди тихо и устойчиво на ниско температурен режим 45/35 (вода/отопление) и това е добре.
    На всички ви желая честита Коледа и весела Нова година!

    Added after 23 [minutes]:

    >>21358856 My boiler, 24 kW, ignites and maintains a fairly stable modulation at the minimum power level. The factory settings are set with one change to the 420 indicator for operation at a low temperature mode (0) - 20-35 degrees in the heating position.
  • #107 21388738
    datusan
    Level 4  
    Hello and a happy new year,
    In my case I think I have solved the electronics of the genus one boiler. I no longer have occasional stops in operation. The 93c46 eeprom had problems communicating on the Tx line with the microcontroller. I think that the automatic calibration data is stored in this memory. The problem is that the falling edge on the tx signal is not correct. Thus, the data read from the eprom memory is very likely wrong. The 93c46 eeprom was changed and no improvement, the problem is the R5F212AC microprocessor. The solution is a pulldown resistor and capacitor on the TX pin and after that an automatic recalibration is made. Details in the attached image.
    Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing Partss1.jpg Download (56.37 kB)

    the first two images are with the initial situation, the last two are with the corrected situation.
    Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing PartsIMG_202412...133206.jpg Download (1.34 MB)
    Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing PartsIMG_202412...133253.jpg Download (891.79 kB)
    Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing PartsIMG_202412...133431.jpg Download (1.07 MB)
    Ariston Genus One System: Addressing Gas Boiler Errors 501,504,309,5p3 After Replacing PartsIMG_202412...133505.jpg Download (913.82 kB)
  • #108 21401588
    danielkol91
    Level 10  
    How did you mount it? Did you solder directly to the pins?
  • #110 21408403
    danielkol91
    Level 10  
    I would like to test on my motherboard. Could you be specific about which parts you have soldered? I think if it helps me, then you have solved the subject professionally 🙂 .
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  • #111 21409048
    datusan
    Level 4  
    There are two components, a 33 kohm resistor and a 22 picofarad capacitor.
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  • #112 21423638
    luk225
    Level 10  
    Anyone know of a definitive solution to error 309 - gas relay error on Ariston Genus One?
  • #113 21424244
    seattmm
    Level 9  
    my ariston genius one24 all time start and stop ignition, what's problem?
  • #114 21424261
    BLANDEL
    Level 3  
    Hello Luk225,
    after replacing the PCB with a new one, I had this anomaly. I did not reassemble the front panel during recalibration (menu 272). I did a closed front calibration again, no more problems. Please check this.
  • #115 21428097
    seattmm
    Level 9  
    BLANDEL wrote:
    Hello Luk225,
    after replacing the PCB with a new one, I had this anomaly. I did not reassemble the front panel during recalibration (menu 272). I did a closed front calibration again, no more problems. Please check this.


    Thanks, change PCB now working perfectly !
  • #116 21431955
    cmosgr
    Level 4  
    My genus one suddenly starts for 5 seconds and stops and after a minute it's doing that again and again.

    Heating is OFF but it just starting without any reason or errors?

    I have increased the temperature and it's working fine and doesn't start and stop anymore.

    Has this happened to anyone?

    seattmm wrote:
    my ariston genius one24 all time start and stop ignition, what's problem?


    I have the same boiler and I just had the same problem. What is going on..
  • #117 21431982
    seattmm
    Level 9  
    cmosgr wrote:
    My genus one suddenly starts for 5 seconds and stops and after a minute it's doing that again and again.

    Heating is OFF but it just starts without any reason or errors?

    I have increased the temperature and it's working fine and doesn't start and stop anymore.

    Has this happened to anyone?

    seattmm wrote:
    my ariston genius one24 all time start and stop ignition, what's problem?


    I have the same boiler and I just had the same problem. What is going on..


    I Change PCB now working good,
  • #118 21438977
    danielkol91
    Level 10  
    In my furnace, after changing the parameter 2.2.0 to 35, there have been no errors for a month. I should add that I already have the board after the technological change.
  • #119 21451101
    alecc214
    Level 1  
    Hello guys,

    So, I was struggling with the same problem (different error codes 5p6 etc.) and just wanted to change bcp transistors and all but before that I started to look around for any temporary solution.
    I came across a YT video, where a guy removed a rubber bumper from the gas valve and I did exactly the same as he did. Since then I have no error codes at all, working as intended.
    Here is the link for the video:



    Be careful if you remove the first tube (not the black plastic stuff), because the gasket might fall out from it and land on the back of everything where it is hard to reach.

    Hope it helps for somebody.

    Note: the rubber bumper is only there for mitigating the sound when the valve opens, so removing it will lead to a clicky sound whenever the valve opens, but since then it works, so worth it ^^
  • #120 21453451
    sethbv
    Level 1  
    I have replaced the 1nF capacitor and the relay, it works fine for a few hours and then throws a gas relay check failed and pcb error. I cannot get rid of this error until I start pushing on the pcb in random places with some piece of plastic after I do this it works fine again for a few hours. I suspect some cold joints but don't know where to look
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Topic summary

The Ariston Genus One gas boiler commonly exhibits intermittent error codes 501, 504, 309, 5P3, and 5P6 related to flame detection and gas relay failures, often after several years of operation. Key issues include flame lift, no flame detection, and gas relay check failures. Replacing ignition and ionization electrodes provides temporary relief but does not fully resolve errors. PCB faults are frequently implicated, particularly cold solder joints, failing SMD capacitors (notably a 1nF capacitor connected in parallel to the gas valve solenoid), overheating resistors near the gas valve transistors, and failing BCP53-16 transistors controlling the gas valve. Resoldering ICs and components, replacing electrolytic and ceramic capacitors, and upgrading resistors to higher wattage versions have been reported to improve stability. The Omron 24V 5A relay on the PCB is often replaced, though some users report it is not the root cause. Firmware issues and software calibration parameters (e.g., parameter 220 controlling burner start power) may influence ignition behavior and error frequency. Some users suggest that environmental factors like ambient temperature and gas quality affect error occurrence. A definitive hardware fix includes replacing the BCP53-16 transistors with higher power dissipation types (e.g., BD140-16) and adding heatsinks. Replacing the entire motherboard resolves issues but is costly and may only be a temporary solution. Alternative solutions include retrofitting the boiler to the Ariston Clas One model with a different electronic module and gas valve. Detailed PCB schematics and voltage measurements have been shared by users to aid diagnostics. Calibration is performed via the boiler service menu (parameter 272). Persistent errors may be linked to microcontroller communication issues with the 93c46 EEPROM, resolved by adding a pulldown resistor and capacitor on the TX line. Overall, the problem is multifactorial involving hardware aging, solder joint integrity, component quality, and software calibration, with no single universal fix but a combination of component replacements, resoldering, and calibration improving reliability.
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