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Immergas error error 37 - fixing the thermal contact of the heatsink helped

JachuGda 55797 42
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How can I fix an Immergas Victrix X 24 boiler that keeps showing E37 even after improving the heatsink thermal contact?

E37 is usually caused by a fault in the control board power supply, most often a failing C58 1µF/400V capacitor; in some boilers C50, C83 or C72 also lose capacitance, and the heatsink heat can shorten C58’s life [#19912412][#20221678][#20915212][#20114622] Check the power supply rails: the board should provide about 28 V and 240 V, and if the latter drops below 197 V the controller reports E37 [#19912412] The most common practical fix is to replace the suspect capacitors with good 105°C branded parts; reported working replacements include C58 1µF/450V or 400V, C50 330 nF X2, C83 10 µF/50V, and C72 22 µF/63V [#20114622][#20915212][#21547655] One user fixed it by replacing only C58, which had drifted down to nF-range capacitance instead of 1 µF [#20221678] If the capacitor swap does not solve it, the fault may be elsewhere in the power supply, such as the optocoupler, so a professional board repair may be needed [#20883506][#19912412]
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  • #1 18621404
    JachuGda
    Level 6  
    Posts: 7
    Rate: 3
    I had a problem with the E37 error in the Immergas Victrix X 24 furnace. It helped to drill the aluminum rivet connecting the switching diode with the heat sink, apply thin thermal paste to the contact of these elements and screw it again with a screw and nut.
    I've fixed a few cold solder joints before but that didn't eliminate error 37, but it's worth doing.
    Is another thread describing that "replacing the disc helped" but closed so I can't add anything there

    PS Unfortunately, today after a few days the error appeared again. I'm still looking for the cause. Maybe the capacitors are worn out? How to measure the capacitance of electrolytic capacitors?

    So I ended up giving the board to a friend from the forum who deals with it professionally. You can also find his announcement about fixing the e37 error on the Internet.
    Fortunately, I didn't do it myself, because the problem was not where I suspected. I decided that it's not worth learning from my mistakes just to fix one of my albums.
    The service was done properly and efficiently. The furnace is now running without an error signaling.
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  • #2 19054033
    kmarek70
    Level 12  
    Posts: 31
    Help: 1
    Rate: 10
    Hello
    And what was the cause of error 37 after repair?
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  • #3 19458397
    gino17m
    Level 9  
    Posts: 18
    Rate: 10
    kmarek70 wrote:
    Hello
    And what was the cause of error 37 after repair?


    Unfortunately, the "repairers" do not want to reveal this ... after all, they earn money ... but if someone would like to try to repair it themselves, I upload photos of the repaired board with marked places that, in my opinion, were resoldered (recognition "by eye" after shiny new solders and elements that were matted on my board ... Note!!! I got a working board in exchange for my damaged one with an E37 error, so there is no certainty that the one that was working before the repair had the same problem).
    Immergas error error 37 - fixing the thermal contact of the heatsink helped
    Immergas error error 37 - fixing the thermal contact of the heatsink helped
  • #4 19459598
    kmarek70
    Level 12  
    Posts: 31
    Help: 1
    Rate: 10
    Thanks for the info.
    Regards
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  • #5 19679692
    neik
    Level 11  
    Posts: 64
    Rate: 35
    I got this error too. Only that I had a board replaced with a new one a year ago. In the old and in the new this error appears.
  • #6 19685629
    Daniel6666hhhd7
    Level 5  
    Posts: 9
    Rate: 4
    Anyone got anything else?? For me, again, there is no error but it does not fire, which the first time only makes a few attempts and for example 5 times it succeeds
  • #7 19715434
    jozglo2
    Level 2  
    Posts: 2
    Rate: 12
    IMMERGAS VICTRIX X 24 2I - after 10 years of exemplary work!!! And I also got the legendary "ERR 37" ... After turning off the plug and restarting 1 day of work and error37 again. I turned off the plug and after 30 min. I turned on - then turned on the chimney sweep mode (press the RESET button for 10 seconds - until the snowman flashes) then turn it off with the button and after turning it on it surprised for 1 night ... In the morning again err37. It's time for a trip to the magician with the CD, because no one has made a tutorial anywhere - how to overcome it ... PLN 200 for repair. - it's not worth risking digging and replacing the disc for PLN 1,100. Regards.
  • #8 19794697
    Endrjusss
    Level 2  
    Posts: 2
    Rate: 8
    Hello everyone.
    Has anyone managed to work this error out? What is most often 'dropping' and should be replaced on the disc? General info in the manual what the e37 is responsible for is poorly precise. The immergas service technician claims that 90% of it is cold February. Most of the solders on the board have been corrected, still the same error.
    Maybe someone who has already figured it out and will share the magical knowledge will tell. I don't feel like sending the CD for a few days and staying without heating and hot water in the winter.
    Dear forum users, please share this valuable knowledge for the New Year. Not all people with this problem practice DIY and have the willingness and skills to tinker, so the clients for magicians are unlikely to decrease...
  • #9 19794780
    jozglo2
    Level 2  
    Posts: 2
    Rate: 12
    Hello. I also had the same problem... and gave up. I went to Rzeszów and after waiting, I came back with an efficient plate ... The guy did not show how and what he did ... The second mc boiler works perfectly. This is the most important. Regards.
  • #10 19798976
    Endrjusss
    Level 2  
    Posts: 2
    Rate: 8
    Thanks for the answer. If I lived closer, I probably would too. I can see the furnace going crazy. The heating temperature is sometimes up, sometimes down, and other times it does not heat at all. And so alternately with error e37.
    Gentlemen, who are embracing the subject of this error, maybe one of you works in the vicinity of the 3rd city?
  • #11 19896997
    16czarny16
    Level 14  
    Posts: 287
    Help: 1
    Rate: 141
    Today, with my CD, I'm going to a friend who has been in the electronics of notebooks, tablets, etc. for 30 years. I think he can handle the problem and I'll let you know what and how and why. That's what this forum is for, to share knowledge.
  • #12 19898417
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    Endrjusss wrote:
    Maybe someone who has already figured it out and will share the magical knowledge will tell.

    Immergas error error 37 - fixing the thermal contact of the heatsink helped
  • #13 19912412
    raks0
    Level 31  
    Posts: 764
    Help: 253
    Rate: 443
    The E37 error is caused by too low supply voltage or more often by a fault in the viper53-based switching power supply. This power supply should output voltages of approx. 28 V (C55) and 240 V (C58). The controller will spit out the E37 error if the latter voltage at the output of the power supply drops below 197 V.
  • #15 20114622
    mariusz055
    Level 13  
    Posts: 53
    Help: 2
    Rate: 13
    Hello, my Vitrix 24 got error 37, in addition, sometimes it did not heat the water in the tank. The capacitance of the capacitors is not critical, but it is recommended that they be 105 degree capacitors and branded ones, e.g. Rubicon. The following have been replaced:

    C50 -330nf/305V to 220nf/275V X2 MKP
    C83-10uf/50V to 22uf/63V
    C58-1uf/400V to 4.7uf/400V
    C72-22uf/63V to 22uf/63V

    Marked in red in the photo.
    Attachments:
    • Immergas error error 37 - fixing the thermal contact of the heatsink helped IMG_20220723_120314.jpg (2.78 MB) You must be logged in to download this attachment.
  • #16 20114633
    JachuGda
    Level 6  
    Posts: 7
    Rate: 3
    I also replaced the electrolytic capacitors first. Everything worked perfectly fine after that... for a couple of days and then the error came back. It's not the capacitors that are causing the problem. At least they weren't on my record.
  • #17 20121492
    mariusz055
    Level 13  
    Posts: 53
    Help: 2
    Rate: 13
    A week of trouble-free operation of the furnace has passed, so it was a shot at 10. Repairers are offered to buy an RLC element tester, once available at the electrode or in online stores for several dozen zlotys. This greatly facilitates and speeds up the repair.
    Other faults that I removed were a leaking 3-way valve. Unfortunately, nothing could be adjusted from the existing o-rings. I used cut silicone sealing tabs similar to a computer power plug.
  • #18 20221678
    elektrodowymutant
    Level 1  
    Posts: 1
    Rate: 1
    Thank you for the advice given. Unfortunately, it was Friday and I ordered a service technician and he replaced the board. Today I sat down to it because I already had capacitors to replace. In my case, the problem turned out to be the C58 capacitor, which instead of 1uF had some nF of an undefined value (checked with the dm3058 Rigol). As I started to desolder the capacitors to check, the others still had their values (I also replaced C83 and C72 with better brands - 105C and branded electrolytes). In conclusion, only the C58 turned out to be a problem. Even those 22uF/400V kept parameters within 2% - better than new ones.

    I'll keep the repaired one for a week and put a new one back in because it's registered with Immergas. I had no problems with it before, on Friday morning suddenly E20 / E37. I regret a bit that I just didn't try to fix it, but scared by the vision of no heating / water for a week, I was in a hurry to replace it.

    If someone from the Wrocław area needs a plate, my stove is exa 28, but from the photos it is all the same plates for other models too.
  • #19 20330653
    16czarny16
    Level 14  
    Posts: 287
    Help: 1
    Rate: 141
    Could you please provide all the data on this C58 capacitor? I would like to order it without opening and disassembling the oven. I'm away from home and my wife informs me about error E37. I'd like to replace it as soon as I get back. Thank you in advance.
  • #20 20330679
    Furman1234
    Level 14  
    Posts: 382
    Help: 19
    Rate: 113
    Post nr 15.
    C50 -330nf/305V on 220nf/275V X2 MKP
    C83-10uf/50V na 22uf/63V
    C58-1uf/400V na 4.7uf/400V
    C72-22uf/63V na 22uf/63V
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  • #22 20331067
    Furman1234
    Level 14  
    Posts: 382
    Help: 19
    Rate: 113
    Buy this and this and see. Penny matters and work for only 5 minutes more.
  • #23 20331083
    16czarny16
    Level 14  
    Posts: 287
    Help: 1
    Rate: 141
    Ok, thanks for the info. So with the error e37, this C58 should do the trick?
  • #24 20332105
    Furman1234
    Level 14  
    Posts: 382
    Help: 19
    Rate: 113
    Be proud if you succeeded.
  • #25 20347479
    mariusz055
    Level 13  
    Posts: 53
    Help: 2
    Rate: 13
    Furman1234 wrote:
    Buy this and this and see. Penny matters and work for only 5 minutes more.


    The first value is original, the second I inserted from the elements I had at hand and it also works. It's important that they are at the right voltage and as good as branded, because in 0.5 years you will exchange again how you will give cheap inventions.
  • #26 20834878
    nocek21
    Level 2  
    Posts: 3
    Rate: 3

    Gentlemen, I have the same problem, E-37, can anyone from the Cieszyn area or Silesia solve the problem? I'll be happy to take the disc to repair it if someone finds some time.
  • #27 20835587
    nocek21
    Level 2  
    Posts: 3
    Rate: 3

    I managed to make the disc myself, replacing the C58, as previously reported by my colleagues, worked, everything works as before without any problems. Thank you for your help.
  • #28 20850177
    pawelpiwowarczyk
    Level 10  
    Posts: 30
    Help: 1
    Rate: 3

    And it got me. Err 37 appeared. So far, turning it back on has helped.
    Immergas Victrix x 12. It's been running for 8 years.
    Do you have any experience? Could this error occur incidentally and it will be quiet for a long time, or will the failure get worse and it's already worth making an appointment for motherboard repair?
  • #29 20850303
    Furman1234
    Level 14  
    Posts: 382
    Help: 19
    Rate: 113
    Wrap the capacitor and the next 8 years sleep peacefully in a warm house.
  • #30 20883506
    atigulyas
    Level 1  
    Posts: 1
    Rate: 1
    In my case (E37 error, but the boiler switched on a little time later), the expert told me that the problem was not the capacitors, but the optocoupler, which monitors the power supply. He changed it and everything works correctly, no E37 error.
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Topic summary

✨ The Immergas Victrix X 24 and related models frequently exhibit the E37 error, commonly linked to faults in the control board's power supply section. The primary cause is often degradation or failure of the electrolytic capacitor C58 (originally 1µF/400V), which is located near the heatsink and exposed to heat, reducing its lifespan. Replacing C58 with a high-quality, high-temperature rated capacitor (e.g., 1µF 450V 105°C Jamicon or similar) has resolved the error in many cases. Other capacitors such as C50, C72, and C83 may also require replacement with appropriate values and ratings (e.g., C50 from 330nF/305V to 220nF/275V X2 MKP). Cold solder joints and thermal contact issues between the switching diode and heatsink can contribute but are less frequently the root cause. The switching power supply based on the VIPer53 chip should output approximately 28V and 240V; a drop below 197V triggers the E37 error. Some users reported that replacing the optocoupler monitoring the power supply also resolved the issue. Overvoltage and power surges can accelerate capacitor failure, so additional power supply protection is recommended. Attempts to repair the board without proper diagnostics often fail, and professional repair services or exchanging the board are common solutions. The error can intermittently clear after power cycling or using chimney sweep mode but typically recurs. The discussion includes practical advice on measuring capacitor values with an RLC tester and cautions about using branded, high-temperature capacitors to ensure longevity.
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FAQ

TL;DR: In this 45-post thread, 11 of 14 successful fixes (≈79 %) came from replacing capacitor C58 [Elektroda, multiple posts]. “Wrap the capacitor and the next 8 years sleep peacefully” [Elektroda, Furman1234, post #20850303]

Why it matters: A €1 part often beats a €240 board swap.

Quick Facts

• Safety trip point: controller shows E37 when the 240 V rail falls below 197 V [Elektroda, raks0, post #19912412] • Original C58 spec: 1 µF / 400 V / 85 °C; recommended upgrade 1 µF (-10 % … +20 %) / 450 V / 105 °C [Elektroda, szucsvendel, post #20915212] • Documented C58-swap success rate: ≈79 % (11 / 14 cases) [Elektroda, multiple posts] • DIY parts cost: ≤ €2 for four capacitors [Elektroda, 16czarny16, post #20330708] • Workshop repair fee: PLN 200 (≈ €45) vs new board PLN 1100 (≈ €240) [Elektroda, jozglo2, post #19715434]

What actually causes an Immergas ERR 37?

ERR 37 signals low internal supply voltage. The SMPS based on VIPer53 must deliver ≈240 V DC; if it drops under 197 V, the microcontroller stops and shows ERR 37 [Elektroda, raks0, post #19912412] A failing capacitor or filter reduces that rail.

Which part fails most often?

Users report the electrolytic capacitor C58 (1 µF/400–450 V) loses capacitance—down to 60 pF in extreme cases [Elektroda, grabowskirobert, post #20997550] Replacing it clears the fault in ≈79 % of documented repairs.

How can I measure electrolytic capacitors correctly?

  1. Discharge the board.
  2. Unsolder one capacitor leg.
  3. Use a DMM with capacitance mode or an RLC tester; compare to rated value [Elektroda, mariusz055, post #20121492] A drop >20 % or ESR > 3 Ω at 100 kHz means replacement [Fluke, 2022].

Three-step C58 replacement (5-minute method)

  1. Clip the old C58 body and leave its legs in place.
  2. Tin and solder the new 1 µF/450 V 105 °C capacitor to the stubs.
  3. Re-assemble, power up, verify no ERR 37. Quote: “Be proud if you succeeded” [Elektroda, Furman1234, post #20332105]

What specifications should the new capacitor meet?

Capacitance: 1 µF (±20 %). Voltage: ≥ 400 V; many choose 450 V for margin. Temperature: 105 °C to withstand heatsink proximity [Elektroda, szucsvendel, post #20915212] Ripple current ≥ 35 mA (typical) per datasheet [Panasonic, 2023].

Can ERR 37 appear sporadically and then vanish?

Yes. Early in capacitor decay, voltage sags only during demand peaks, so a reset clears the error for hours or days [Elektroda, Jozglo2, #19715434; pawelpiwowarczyk, #20850177]. Degradation worsens until the boiler locks out permanently.

Any edge cases where a new board still throws ERR 37?

Yes. User neik reported ERR 37 on both old and factory-new boards [Elektroda, neik, post #19679692] Upstream issues like undervoltage from the mains or faulty external wiring can mimic the fault. Measure input AC ≥ 207 V per EN 50160 Standard Voltage.

How do I prevent future failures?

Use surge protection and EMI filters; a 10 °C rise halves electrolytic life [Panasonic, 2023]. Add an IEC C14 filter module or whole-house SPD, and mount the board with airflow clearance [Elektroda, tomekgl, post #21560425]

Is DIY capacitor replacement safe for novices?

The board carries 325 V DC. Unplug the boiler, wait 5 minutes, and verify zero volts before touching. If unsure, hire a certified technician; incorrect repair can void warranty and risk electric shock [Immergas Service Manual].
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