logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

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

JachuGda 55797 42
Best answers

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]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #31 20915212
    szucsvendel
    Level 1  
    Posts: 1

    Hello,
    I also managed to repair the E37 error code problem. (Victrix 26)
    I replaced the electrolytic capacitor C58 and the boiler is working normally again.
    New: 1uF 450V 105°C Jamicon
    Original: 1 uF 400V 85°C ELNA
    I hope that this replacement actually solved the problem and the error does not occur again.
    I think the root cause of the error is: The C58 capacitor is very close to the heatsink, which is hot. The heat of the heatsink reduced the life of the condenser. When I removed the plastic cover of the panel, I felt that the whole unit was slightly warm.

    I strongly recommend that you try replacing the C58 capacitor before you buy the new expensive control panel. (It's worth a try.)
    The old capacitor should be cut with a small cutting-nippers. The new capacitor can be soldered onto the cut leg relatively easily. In this way, the panel does not have to be unscrewed and turned over for soldering.
    I hope that everybody will be able to fix the Immergas E37 error code phenomenon.
    If you have any questions, I will try to help.

    Control board of Victrix 26 boiler with highlighted capacitor C58. View of a circuit board with a replaced capacitor C58. ELNA electrolytic capacitor 1uF 400V on a brown background.
  • ADVERTISEMENT
  • #32 20978563
    Tomasz Antkowiak
    Level 12  
    Posts: 110
    Rate: 9
    Our 10-year-old Immergas also got Err 37 today... I didn`t have a 1uF 400V electrolyte, so I replaced it temporarily with a 10uF 450V one. The furnace is working for now, but tomorrow I will buy the right element and solder it. Anyway, this electrolyte seems to do the trick.
  • ADVERTISEMENT
  • #33 20997550
    grabowskirobert
    Level 11  
    Posts: 6
    Rate: 2

    For me, replacing the capacitor helped with error E37 in the Immergas EXA 24 boiler C58 . The old one only had 60pF instead of 1uF.
    After the replacement, the furnace started and works :-)

    Circuit board of Immergas EXA 24 boiler with replaced capacitor C58.
  • ADVERTISEMENT
  • #34 21180477
    adam998
    Level 25  
    Posts: 1219
    Help: 4
    Rate: 187
    Hello,
    Yesterday in my 13 year old VICTRIX X2 24KW V.2011 error E37 popped up quickly on the internet I immediately found your posts on this topic :-) This morning to the shop soldering iron tin, capacitors.... to start with I replaced this C58 1uf/400V at 105 degrees I mounted the board the boiler is running :-)
    Thank you to all who have commented here
    Regards
  • #35 21188268
    adam998
    Level 25  
    Posts: 1219
    Help: 4
    Rate: 187
    Hello the joy was short-lived with the removal of the E37 error today I popped up with the E04 error has anyone perhaps had such an error ?
  • #36 21292060
    juveniaolsztyn
    Level 2  
    Posts: 2
    Image of a boiler's connection panel with visible wires and a resistor. Hi, from the description of the E 37 error, it seems that it could relate to faults on the motherboard or on the devices connected to it, i.e. the detector or the controller. I don't know anything at all about electronics, but I decided to check the latter option. I started to unscrew the furnace housing and became interested in the small box underneath, which has two cables: in my case, a black one from the temperature sensor from the water tank and a white one from the controller located in the hallway. On the lid of the box are shown the wiring diagrams of these devices. And interestingly, I saw a resistor, which according to the diagram was supposed to be connected to inputs 36 and 37 together with the temperature sensor wires, was lying loose on the bottom of the box. On its "legs" were visible traces of screw pressure from the mounting strip. Furthermore, I am puzzled by the black wire coming out of input 40, with also visible screw pressure marks from the trim. My question is whether (I made it provisional for the photo) this is how I should connect the resistor (maybe the other way round) and whether, in your opinion, according to the diagram, the black wire hanging down should be bridged to input 41. If I get it right and it's ok, then great, if nevertheless the E37 error still appears, then I'll get on with the board.
    Image of a hand holding a panel with a wiring diagram in a furnace, showing entry numbers from 36 to 44. .
  • #37 21292154
    Rysio4001
    Heating systems specialist  
    Posts: 2968
    Help: 604
    Rate: 1053
    @juveniaolsztyn
    In your case, this is how it is supposed to be!
    That resistor is supposed to be removed (disconnected), and that bridge is supposed to be disconnected too.
    Just take a look at the original instructions in the installer section, you'll know why, and that this is correct.

    P.S. I can see from the photo that you did, however, fuse your fingers, and connect this resistor.
    And how - do you now have hot water ? :twisted: .
  • #38 21299083
    juveniaolsztyn
    Level 2  
    Posts: 2
    Thanks, of course not. As I've mentioned I don't know much about electronics, but I do like screwing screws. Of course everything is back in its place, i.e. the resistor on the bottom of the box. Thanks, I will now get down to the C58 capacitor as you suggest. Thanks kind regards.
  • #39 21511875
    sefaygll
    Level 1  
    Posts: 1
    Rate: 1
    I respect that. Thanks to this topic, I repaired the combi boiler in my house. My combi boiler is Immergas Eolo Star.
  • #40 21547655
    tomekgl
    Level 16  
    Posts: 119
    Help: 13
    Rate: 57
    At my place, in the Immergas Victrix 12 TT ERP (2018 year) C58 was fine, for that the capacitor in the filter circuit on the power supply lost capacitance, C50 was 12n instead of 330nF. After replacing it with 330nF/310V X2, the boiler has been running flawlessly for a few days, whereas before it was popping E37 after just a few hours.

    Close-up view of Immergas boiler mainboard with highlighted and annotated capacitors and other electronic components. .
  • #41 21548361
    miszka86
    Level 1  
    Posts: 1
    Hello
    I have replaced the C58 with a neighbour and unfortunately the error still pops up and the cooker does not heat water. Is there anyone from Poznan or nearby who could diagnose and repair ?
  • ADVERTISEMENT
  • #42 21560425
    tomekgl
    Level 16  
    Posts: 119
    Help: 13
    Rate: 57
    After two weeks of flawless operation, the boiler stopped switching on, alternating between E20 and E37, which could no longer be cleared.

    It turned out that C58 1µF/400V had lost its capacitance. After replacement it has been working for another week.
    There was a power cut on the same day, maybe the surge when switching it on finished it off, as it still had 0.9µF 2 weeks earlier.

    The conclusion is to use extra protection and overvoltage/anti-interference filters on the power supply.
  • #43 21706595
    orlincho
    Level 1  
    Posts: 1
    Another happy thread user. Immergas Victrix 26 developed E37 for second time in two years.
    First time I've replaced everything from the list
    C50 C83 C58 C72
    two years after, new E37 - review of C58 shown that again 1uF/400V Fujicon have gone to ~0uF. Replaced with spare one purchased before but will prep next batch of capacitors form another manufacturer for the next time.
Reply | New topic
Report a violation of the law

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.
Generated by the language model.

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].
Generated by the language model.
ADVERTISEMENT