Introduction
Problem: just before/shortly after starting to heat up, the oven causes the house HFI relay to switch off all power to the house.
(I assume 'HFI relay' is another term for of these: GFCI - Ground Fault Circuit Interrupter, ELCB - Earth Leakage Circuit Breaker, RCD - Residual Current Device, RCCB - Residual Current Circuit Breaker)
I called a professional repair man, and after an inspection he concluded that the main PCB had to be replaced, and adviced me that I was better of buying a new oven. So with nothing to loose, I therefore decided to try repairing it myself.
What you need
Featured Document
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This particular model is HB76A1560S, but the guide may aply to other. I believe similar ovens are sold under the brand Bosch.
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See guidelines in the attached PDF document
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As per the PDF document: bring the oven into test-mode and start stepping through each menu
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Identify at which test step the problem occurs and the house HFI relay is triggered
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(Dangerous!) Remove the backpart, and detach the wires to the heating elements one by one, until the above test step is no longer triggering the HFI relay. Take care to neither cause short circuit nor get yourself electricuted... You probably want to disconnect the oven each time you detach a wire
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Assuming you now know which circuit that is causing the problem: have a look under the toppart. In my case the problem originated from the control PCB
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After probing the PCB with a multimeter, I concluded that the relay marked 'B' must be defect. In fact, that realy was visually damaged. It looked like a spark had burned a hole in its plastic housing
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Order a new relay and solder it in
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Re-run the test program, and verify that the oven is no longer triggering the HFI relay
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April 2015 I replaced relay B. May 2018 I replaced relay C. May 2020 I replaced relay D.
Any one that could guid me to the details of the two smd components after the relay A output? This is the lamp control relay.. they are visual defekt.. confensator/diode/resistor.? And value ?
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
Cancel: I did not complete this guide.
5 other people completed this guide.
Attached Documents
45 Comments
Excellent article LarsWH!
I have this problem with the same control board (4th relay from the left next to ‘C’). I will also attempt the repair and will order a replacement relay. However I cannot get an exact match. I can match ‘HF3FD 009-H3F(576)’ - these appear to be the important codes. However there is a 4 character code at the bottom of the Relay (JI22). I’m not sure if this is important and it’s not mentioned in the PDF attached to your post. Any advice welcome! - Thanks, Jon
Thanks a lot Jon :-)
I am pretty sure that the ‘sugear cube relay’ you have found is OK. The additional code is probably just a manufacturing batch code (one of my remaining relays actually says ‘JK36D’…).
Good luck with the reapair and be carefull with that mains stuff.
LarsWH -
Hej Lars
Jeg har også problemer med relæboardet i min Bosch ovn. Trigger hpfi relæet. Jeg har fundet ud af at det er relæ D, det til højre for C ;) Jeg har loddet det ud og nu kører ovnen dog uden undervarme. Men tænker om du måske har et relæ på “lager”. Jeg kan kun finde dem i Kina, men fragt-tiden er jo helt hen i vejret, når man har brug for det nu :)
Og eller tak for et fedt indlæg, havde aldrig fundet fejlen uden din hjælp her!
Mvh. Christian
Hej Christian,
Jeg har stadig 3 relæer liggende, og kan fint sende dig et. Skriv lige en SMS til mig (6171 8242) med din adresse, så kan jeg nok send i morgen (fredag). Brevporto er 9-18kr afhængig af vægt og så koster relæet 15kr.
Jeg er glad for at du kunne bruge min vejledning :-)
Mvh
Lars
LarsWH -
Hej Lars
Jeg vidste ikke lige at du ville svare så hurtigt, så jeg har bestilt sådan et her i dag https://elektronik-lavpris.dk/p103900/f3... Det har ca. samme specs. som det originale, 9V og kan klare 10A/240V, samme fysisk størrelse, så det passer ind på printet, så måske virker det. Burde få det i morgen fredag. Men hvis det ikke virker, så vil jeg meget gerne tage imod dit tilbud
Jeg poster lige resultatet her i din tråd på engelsk, hvis det virker, så er det god info til andre, da det lader til at være nemmere at få fat i her i europa
Endnu en gang tak for hjælpen
Mvh. Christian
Hi
If you cannot get hold of a HF3FD relay a Finder 36.11.9.009.43 will also Work. My Bosch oven is now working again
Thank to Lars for his Work :)
Best Regards,
Christian
Hej Lars.
Fedt indlæg!
Grill-elementet i min Siemens ovn er tændt konstant - uanset hvilket program jeg vælger. Har du evt en ide om hvad der kan være galt?! :-)
Mvh Mads
Hej Mads
Fandt du af hvad der var galt? Jeg bøvler nemlig med samme problem hvor grill element er tændt konstant når oven er tændt. Og har nemlig lige skiftet A B og C relæ'er men ikke hjulpet.
Mvh Johnny
Hej Mads
Fandt du årsagen? Jeg bøvler nemlig med samme hvor grill element er tændt konstant når oven er tændt.
Mvh Johnny
Hej Mads,
Det kunne såmænd nok være et defekt relæ. Lyder der troværdige “klik” når du skifter mellem testprogrammerne c2:00, c2:27 og c2:17? (selv om relæerne klikker fint, kan der godt være kortslutning inden i dem)
Bag på ovnen er der nogle spadestik, der forbinder de forskellige varmelegmer. Du kan evt. starte med at frakoble det grill-element, der giver problemer, og så prøv at regne ud hvor problemet ligger (frakobling kan vist også gøres på printet). Og pas nu godt på dig selv…
Hvis du tror problemet ligger på printet, kan du skrue printet frit, og rimelig nemt følge kobberbanerne til det relæ, der er under mistanke. Med et voltmeter kan du nok konstatere, om der er konstant fobindelse (i modsætning til de relæer der virker korrekt).
Held og lykke med fejlfindingen,
Lars
thanks for guide. I saw the rely failing by turning main fuse back in. when trying to start the owen, it shorted, and a spark was seen inside B. i dis-soldered it and replaced by C. currently waiting for replacements from china.
btw. the test mode was the two direction arrows next to wheel for 3 sec. beep. then(without releasing) also press start. beep. turn wheel for service mode.
go to eprom and select
try different modes to see when power fails.
thanks again for guide.
used it for:
HB78A1590S /03
added for searchengines pickup
takker fra Norge
Hello,
I have HB78AU570, but the control board looks similar :-). I made this repair already 3 times (first in September 2016, it was 3 weeks after the guarantee ended). But when the last relay was destroyed, the oven didn’t heat at all. I realized that the relays controlling the heating didn’t switch. But the other relays (light, fans) worked properly. I cannot post a picture, I describe it following your photo. All the upper row except relay “A“ is used for heating. Let me say that the other relays in upper row has letters D, E, F and G. Relays B, C, “D” and “E“ is used for each heat section and relays F and G are used for control all heating sections as “second level“. It means when some of the relays B, C, D and E is destroyed (usually it is switched on when destroyed), the heating is safely switched off via these F and G relays. The third level of security is the fact that the coil voltage for these relays (B, C, D, E, F, G) is also controlled by processor.
… continued in next post…
I realized it when I started to draw the schematic diagram according to PCB. When I measured the coil voltage supply path, I found one little transistor which could be destroyed as well. So I tried to change it with a new one (it was BC807-25) and voilà - the oven start to heat again :-). It was really hard, because the transistor is 3 mm long and the contacts have less than 0,5 mm, but this was the only chance…
So I recommend to predict when the relays could be destroyed again and change it in advance… ;-) I already changed the relays B, C and D. If you are interested in, I can send you the photos via email and you can add it to your post.
Zbysek Vesely, Czech Republic
zbysa -
Hi Zbysek,
Good to hear you managed to fix it - multiple times :-) I think it is best if you publish your pictures yourself. I will be happy to link to your pictures/instructions if you send me a link.
I have “only” done the repair twice, but I make sure to keep a spare relay - just in case. Next time I buy an oven, I will make sure that I know how to bring it into test-mode, before buying it. Tracking down problems is just so much easier when you can control things manually.
/Lars
Hej Lars, har du et relæ tilbage? Vh. Lasse
Hej Lasse.
Jeg har fået 5 hjem fra Kina (https://www.aliexpress.com/item/33036131...). Jeg aner ikke om de kan være kopi-produkter, men de ser OK ud. Hvis du bestiller i Kina, er levering gratis, og du har til fremtidige reparationer.
Hvis jeg skal send dig et relæ, så send mig din adresse på SMS 6171 8242. Så kan vi aftale nærmere.
/Lars
LarsWH -
Hej Lars
Jeg har lige hentet mig sådan en ovn der, på forventning om at det var et af relæerne det var galt med. Og selvfølgelig var det det. Jeg har tidligere skiftet hvad bliver kaldt E relæet, men denne gang var det B.
Samtidig har nogen dog leget lidt rigeligt, lader det til, idet de to modstande der sidder på printet foran A relæet og over til kontakt X9 / X10 er himlede. Jeg forventer at det er nogle 0-ohms modstande, men vil lige høre om du ved nærmere? Måske du tog et nærbillede af printet da du rodede med det?
Desværre er Elektronik Lavpris blevet dyre med relæet, så jeg skal vist ud i verden og finde et. Jeg har heldigvis ikke travlt, så en kinapakke kan godt gå.
Hej Keld,
Jeg har desværre ikke nogen billeder der viser modstandene. Det virker lidt underligt, hvis de har sat 0 Ohms modstande i, for det er vist et flerlags print, så den slags burde ikke være nødvendige (men kan selvfølgelig ikke udelukkes). Jeg går ud fra det er på 9V siden, så du kan da forsøge dig med en mindre modstand. Du kan jo høre om relæet klikker - ellers har du nok valgt en for stor modstand.
Mvh
Lars
LarsWH -
Excellent guide! I only found it after having diagnosed my own oven and was searching for a new relay however. So I'll add my own diagnostic process and add some search optimizations.
Problem: When selecting a program and then setting the heat level, the main breaker would trip when the heating started (after about 5 sec.).
Diagnostics: I took the oven apart and checked the circuits etc. visually, but could see nothing wrong. I then turned on the oven with the top cover off (be careful!), and could see a bright flash form one of the relays on the power control board at the exact same time as the breaker tripping.
Measurement with a multimeter showed that the heaters were connected to ground. I isolated this by disconnecting wires to be the same relay on the power control board.
Solution: Desolder the relay and solder in a new one. They were way too expensive locally (dane as well) so I ordered one on ebay in France and another handful from Aliexpress just to have some spares.
Here is a link to the power control board in my oven, which is a bit different from OP.
Number 00646076 or 00656659
Searching for these numbers brings up a lot of different models I will post here so others will have a chance to find this article.
HB73AU545/01
HB73AA540S/01
HB73A4540S/01
HE60AB520/02
HB73AU540/02
HB75RB550B/02
HB73RA550E/02
HB75LB550B/02
HB73LS551E/01
HE63BD511/02
HB63AS520/03
HE73BD550/03
HB73BC550E/03
HB73AA540S/03
HB73LA550E/04
HB73AA550E/03
HB73AR550E/03
HB73AU540/04
HB63AA550B/01
HB73AB550/03
HB73A4240S/03
HB63AA510S/03
HB73RA550E/04
HB65AA221F/02
HE63AB510/03
HB73AU544/01
HE63AB520/03
HE73AU544/01
HB63AB520/01
HB65AB521F/01
HE63AT511/03
HB73AA540/04
HB73RS551E/02
HB73A4240S/04
HB63AB520/02
HB73AU544/02
HE73BD540/05
HE63AB520/04
HE73AB550/04
HE73BD530/05
HB65AA521F/03
HB75BC250F/03
HB75BC650F/03
HE63AB520/05
HE73BD530/06
HE63BD511/01
HE63AB510/05
HB73LS551E/02
HB65AA221F/03
HB63AA520B/03
HB73A4580/02
HB75AB250/03
HB75AB650B/03
HB75BC651F/01
HB73LA550E/01
HB75AB550/01
HB60AB520/02
HB65AA221F/01
HB75BC550F/02
HB73A4540S/02
JBOR -
hb73ar550e/02
hb63aa620b/02
hb73au540/03
hb73a4580/01
hb75ab550b/02
hb73bc550e/02
hb75ab650/02
hb75lb550b/03
hb73la550e/03
hb75rb550b/03
hb73au545/02
hb73ra550e/03
hb63as510s/02
hb75bc650f/02
hb73aa550e/02
he63at511/02
he63at511/01
he73bd540/04
he73ab550/03
he63bd511/03
he73au540/04
he63ab510/04
he73au544/02
hb73ab550s/01
hb73ra550e/01
hb75lb550b/01
hb75ab250/01
hb75ab550b/01
hb63aa620b/01
hb75bc650f/01
hb73a4240s/01
hb73a4640s/01
hb73rs551e/01
hb73au545/03
hb73aa540/03
hb75rb550b/04
hb73a4540s/03
hb73a4640s/03
hb65aa621f/02
hb65aa521f/02
hb75bc550f/03
hb75rb550b/05
hb73aa540s/04
hb73a4540s/04
hb75ab550b/03
hb63aa550b/02
hb73ab550/04
hb63as521/35
hba63b450a
hba63r252b
hba63s250s
hba63s251s
hba63s451a
hba63u350s
hba63u351s
hba70b550
hba73a450e
hba73a520
hba73a520c
hba73a550
hba73a550/01
hba73a550/02
hba73a550/03
hba73a550/35
hba73a550c
hba73a560
hba73a560c
hba73b150b
hba73b250
hba73b250b
hba73b350b
hba73b530
hba73b530s
hba73b550
hba73b550a
hba73b550b
hba73r350b
hba73r450
hba73r450e
hba73r451
hba73ue50
hba74b150
hbb73c350f
hbb73c360f
hbb73c450e
hbb73c520f
hbb73c520f/01
JBOR -
hbb73c520f/02
hbb73c520f/03
hbb73c521f
hbb73c521f/01
hbb73c521f/35
hbb73c522f
hbb73c522f/35
hbb73c522f/45
hbb73c522f/48
hbb73c550f
hbb73c550f/01
hbb73c550f/02
hbb73c550f/03
hbb73c551f
hbb73c551f/01
hbb73c551f/35
hbb73c552f
hbb73c552f/35
hbb73c552f/45
hbb73c552f/48
hbb73c560f
hbb73c560f/01
hbb73c560f/02
hbb73c560f/03
hbb73c561f
hbb73c561f/01
hbb73c561f/35
hbb73c562f
hbb73c562f/35
hbb73c562f/45
hbb73c562f/48
hbg63b420f
hbg63b420f/35
hbg63b420f/45
hbg63b420f/61
hbg63b450f
hbg63b450f/35
hbg63b450f/45
hbg63b450f/61
hbg63b460f
hbg63b460f/35
hbg63b460f/45
hbg63b460f/61
hbg70b550
hbg73b455
hbg73b520c
hbg73b520f
hbg73b520f/35
hbg73b520f/45
JBOR -
hbg73b520f/61
hbg73b530
hbg73b530f
hbg73b530f/35
hbg73b530f/45
hbg73b530f/61
hbg73b530s
hbg73b550
hbg73b550c
hbg73b550f
hbg73b550f/35
hbg73b550f/45
hbg73b550f/61
hbg73b560c
hbg73b560f
hbg73b560f/35
hbg73b560f/45
hbg73b560f/61
hbg73r550b
hbg73s550a
hbg73u150
hbg73u350
hbg73u530w
hbg73u550
hbg73u550s
hbg73ue50
hbl73a450e
hbl73b550f
hbl73b550f/35
hbl73b550f/45
hbl73b550f/61
hbl73s451e
hbl73s452e
hbr73a450e
hbr73b550f
hbr73b550f/35
hbr73b550f/45
hbr73b550f/61
hbr73s451e
hbr73s452e
hca853320f
hca853320f/02
hca853320f/70
hca854450
hca854450a
hca854450g
hca854820
hca854820c
hca855850r
hca857320f
hca857320f/02
hca857320f/70
hca858450a
hce853923f
hce853923f/01
hce853923f/02
hce853923f/03
hce853963f
hce853963f/01
hce853963f/02
hce853963f/03
hce854451a
hce854453
hce854453g
hce854823
hce854823c
hce857923f
hce857923f/02
hce857923f/03
hce858451a
he73gu531
hea60b150
hea63a250
hea63b050
hea63b150
hea63b151
hea63b250
JBOR -
heg73u351
hgd85d223f
hgd85d223f/02
hgd85d223f/03
hgd85d223f/70
hgv85d223f
hgv85d223f/01
hgv85d223f/02
hgv85d223f/03
ha854220f
ha854220f/02
ha854220f/70
ha854280
ha854520f
ha854520f/02
ha854520f/70
ha854580
ha857540f
ha857540f/04
ha857540f/70
ha857580f
ha857580f/03
ha857580f/70
ha858231u
ha858540u
ha858541u
hb60ab520
hb63a1220s
hb63a1520s
hb63a1521s
hb63a1620s
hb63aa510s
hb63aa520b
hb63aa550b
hb63aa620b
hb63ab511s
hb63ab512s
hb63ab520
hb63ab521
hb63ab521b
hb63ab522s
hb63ab551b
hb63ar550f
hb63ar550f/35
hb63ar550f/49
hb63as510s
hb63as520
hb63as521
hb63g1541f
hb63g1541f/61
hb65aa221f
hb65aa221f/01
hb65aa221f/02
hb65aa221f/03
hb65aa221f/04
hb65aa221f/35
hb65aa521f
hb65aa521f/01
hb65aa521f/02
hb65aa521f/03
hb65aa521f/04
hb65aa521f/35
hb65aa621f
hb65aa621f/01
hb65aa621f/02
hb65aa621f/03
hb65aa621f/35
hb65ab222f
hb65ab222f/35
hb65ab222f/45
hb65ab222f/49
hb65ab222f/61
hb65ab521f
hb65ab521f/01
hb65ab521f/35
hb65ab522f
hb65ab522f/35
hb65ab522f/45
hb65ab522f/49
hb65ab522f/61
hb65ab555f
hb65ab622f
hb65ab622f/35
hb65ab622f/49
hb65ab622f/61
hb65gr240f
hb65gr240f/35
JBOR -
hb65gr240f/45
hb65gr240f/49
hb65gr540f
hb65gr540f/35
hb65gr540f/45
hb65gr540f/49
hb65gr640f
hb65gr640f/35
hb65gr640f/45
hb65gr640f/49
hb65lr555f
hb65lr560f
hb65lr560f/35
hb65lr560f/45
hb65lr655f/45
hb65lr660f
hb65lr660f/35
hb65lr660f/45
hb65rr555f
hb65rr560f
hb65rr560f/35
hb65rr655f/45
hb65rr660f
hb65rr660f/35
hb65rr660f/45
hb73a1540s
hb73a4240s
hb73a4540s
hb73a4580
hb73a4640s
hb73aa540
hb73aa540s
hb73aa550e
hb73ab541
hb73ab541s
hb73ab550
hb73ab550s
hb73ar550e
hb73au540
hb73au544
hb73au545
hb73bc550e
hb73g4240s
hb73g4241s
hb73g4540s
hb73g4541s
hb73g4580
hb73g4640s
hb73g4641s
hb73gb550
hb73gr555
hb73gu540
hb73gu545
hb73la550e
hb73ls551e
hb73ls552e
hb73ra550e
hb73rs551e
hb73rs552e
hb74ab550
hb75aa550c
hb75aa560s
hb75aa650c
hb75ab250
hb75ab550
hb75ab550b
hb75ab650
hb75ab650b
hb75bc250f
hb75bc250f/01
hb75bc250f/02
hb75bc250f/03
hb75bc251f
hb75bc251f/01
hb75bc251f/35
hb75bc252f
hb75bc252f/35
hb75bc252f/45
hb75bc252f/48
hb75bc550f
hb75bc550f/01
hb75bc550f/02
hb75bc550f/03
hb75bc550f/35
hb75bc551f
JBOR -
hb75bc551f/01
hb75bc551f/35
hb75bc552f
hb75bc552f/35
hb75bc552f/45
hb75bc552f/48
hb75bc553f
hb75bc650f
hb75bc650f/01
hb75bc650f/02
hb75bc650f/03
hb75bc650f/35
hb75bc651f
hb75bc651f/01
hb75bc651f/35
hb75bc652f
hb75bc652f/35
hb75bc652f/45
hb75bc652f/48
hb75bc653f
hb75bd550
hb75gb250
hb75gb550
hb75gb550b
hb75gb550c
hb75gb560s
hb75gb650
hb75gb650c
hb75gr260f
hb75gr260f/35
hb75gr260f/45
hb75gr560f
hb75gr560f/35
hb75gr560f/45
hb75gr660f
hb75gr660f/35
hb75gu550
hb75gu550a
hb75lb550b
hb75lb551b
hb75rb550b
hb75rb551b
hba63b150b
hba63b350b
hba73b150b
hba73b250b
hba73b350b
hba74b150
hbg63b420f
hbg63b450f
hbg63b460f
hbg73b520c
hbg73b550c
hbg73b560c
hbl73b550f
hbl73s452e
hbr73b550f
hbr73s452e
hc854263f
hc854263f/01
hc854263f/02
hc854263f/03
hc854273u
hc854283
hc854543g
hc854563f
hc854563f/01
hc854563f/02
hc854563f/03
hc854583
hc857283f
hc857283f/01
hc857283f/02
hc857283f/03
hc857583f
hc857583f/01
hc857583f/02
hc857583f/03
hc858543u
he60ab520
he63ab510
he63ab511
he63ab520
he63ab521
he63at511
he63at512
JBOR -
he63bd510
he63bd511
he63bd512
he63bd513
he73ab550
he73au540
he73au544
he73bd530
he73bd531
he73bd540
he73bd541
he73bd550
he73bd551
he73gb550
he73gu531
he73gu540
hr85d263f
hr85d263f/01
hr85d263f/02
hr85d263f/03
hx85d220f
hx85d220f/02
hx85d220f/03
hx85d220f/70
JBOR -
And my own which strangely is not in the list: Siemens HB73A1640S
JBOR -
Thanks JBOR.
What an impressive list. I am sure this will help more people find these instructions :-)
It is a good idea to keep a few relays spare - I have had to do this repair a few times. Be aware that relays from Aliexpress may very well be salvaged parts - perhaps from Siemens ovens :-(
LarsWH -
Hejsa Lars
Super god guide. Jeg kæmper med min ca. 5 år gamle ovn, Siemens hb75gb560s/61, og jeg skiftede derfor i dag alle tre varmelegemer uden resultat. Den slår HFI relæet ca. 5 skeunder efter jeg tænder ovnen.
Efter at have læst denne guide, så tror jeg måske, at jeg står med samme problem. Altså et defekt relæ på kontrol-boardet. Jeg har en (den du kalder C) der "gnister" når ovnen slår HFI'en. Det er vel den der er defekt og skal skiftes?
Det er ca. 10 sekunder henne, og "C" er markeret med tusch prikken :-)
Se video:
https://photos.app.goo.gl/fLDh7Jbf8mizjU...
Hej Per,
Det lyder meget som det problem jeg har oplevet, og det er bestemt et forsøg værd. Og når du er i gang, så købe gerne nogle ekstra relæer - jeg har måtte skift i to omgange nu, og det sker sikkert igen.
Mvh
Lars
LarsWH -
Hej Lars
Problemet var relæ "C", og ovnen kører igen efter der er loddet et nyt relæ i.
Jeg bestilt et par relæer, SPDT 10A 9V 225R 36.11.9.009.4000, fra https://elektronik-lavpris.dk/p103900/f3...
De er et fint og tilgængelig alternativ til HF3FD 009-H3F(576), der skal bare lige klippes et ben af.
Mange tak for den yderst anvendelige guiden. Næste skridt var ellers en ny Siemens ovn til 5.000 kr.
Her er et par fotos af processen til andre der skal i gang med det samme:
https://photos.app.goo.gl/eAVXZFCvDs1j6L...
Mvh. Per Have
Per Have -
Hi Per and @larswh
Thanks for a great guide to Lars and some great photos to Per.
I have an identical model which Per Have has described with the exact same problem (also a dane here).
I was worried that my oven was connected in a way, which required an electrician to disconnect it, but after having pulled out the oven, I found that the cable clicks out from the oven perfectly fine, so no need for an electrician.
Quick question: How do you disconnect the wires from the control board?
I haven't tried it before and I am worried I might break something if I apply too much force in the wronge direction.
Hello, I have a problem with the oven, it gives me error 80 / as in the picture with the arrow, I replaced all three relays B, C and D, but again the same problem, when the oven heats up to a certain temperature after about 10 to 15 minutes, it switches off and gives 80 with an up arrow, please help
Nenad
I think your problem is different. In my case I lost the light in the entire house when the faulty relay was triggered.
I think the 80 in my picture is just a temperature-limit for the thermometer that can be attached - not an error code. The socket for the temperature sensor (inside the oven) can get dirty and cause wrong readings. Every now and then I have to clean inside the socket with cotton swaps soaked in isopropyl alcohol. Also try running a few tests with the thermometer attached and detached, and make sure it is working.
If the problem persists, make sure you run the oven in test-mode (as described in the document above), and find which step is triggering the problem. Good luck.
LarsWH -
Thanks for the help, you were right, it's still the thermometer from the oven, I just unplugged it from the stove and now everything is fine, I haven't tried the needle thermometer yet
Thanks
Hej @esben_r
Er dine ledninger til ovnene ikke bare samlet i en dåse med samlemuffer? Jeg ved godt, at man ikke må 😅, men jeg ville bare åbne dåsen, tage et billede, pille de tre ledninger fra ovnene ud af mufferne (nul, fase og jord). De skal jo bare i samme muffer igen ved tilslutning.
Tænker ikke, at det er mere uansvarligt end at lodde på et 220v printplade, som du alligevel skal til 😅 Du må endelig ikke begynde at rode med printpladen mens ovnen er tilsluttet ⚡⚠️
Husker ikke hvordan stikkende sad i printpladen, men brug en spidstang og en lille skruetrækker, og være opmærksom på om nogen af stikkene har låsepaler👍 Husker det ikke som svært.
God arbejdslyst 👍
Tak for svar Per.
Du har selvfølgelig ret mht. at lodde på 220v pladen... Havde jeg ikke tænkt over 😂 - og trist at reglerne så reelt forhindrer reparation, da priserne på reparation jo så gør det for dyrt i forhold til nypris.
Og nej, der er ingen ledning tilslutning mens jeg roder med printet 😅
Men for lige at forstå korrekt, siger du så, at jeg med en spidstang og skruetrækker skal hive/løfte plastikstikkene op fra printpladen?
Sidder jo nøje og nærstuderer dine fine billeder af printet uden stikkene og prøver at regne ud hvilken retning jeg skal "rykke" i - 90 grader/op eller 180 grader/ud til siden - og evt. om jeg skal vippe noget imens. 😊
Nå, det lykkedes mig aldrig at gennemskue hvordan jeg afmonterede ledningerne, men jeg fik dog løsnet printet og puffet ledningerne nok til side til at jeg kunne vende printet om på siden.
Det var lidt bøvlet, men missionen lykkedes.
Jeg fik afloddet det defekte relæ og loddet et nyt på (bor heldigvis tæt på Elektronik Lavpris).
Tak for tippet med at købe https://elektronik-lavpris.dk/p103900/f3... og så afklippe det ene ben.
Nu virker ovnen igen!! 🥳😊
Hi, thank you for sharing your work. I think I might have a similar problem. Once I switch on the oven, all electricity in the house is gone (so clock works when oven is connected, but once you switch the oven on the problem arises).
I read that often, it is one of the heating elements that causes the problem. How can you tell whether it is the heating element instead of the relay?
I have disconnected the ring heating element (back ventilator) -> problem remains
I have disconnected all the wires of the top element -> problem remains
I also read in your post that you read out with multimeter which one of the relays was causing a problem, can you please explain how that is done?
Thank you very much in advance!
Bart
Hi Bart,
I do not know how to check the heating elements. Possibly just disconnect each element and use a multi-meter to check if one of them has connection to ground.
With the top part taken of (be careful not to get yourself electrocuted...) and the lights in the room low, I could see some of the the relays light up, when a small spark is generated inside. While shifting through the test programs, I could then identify which relay that 'lid up' at the same time as the the entire house went dark.
The spark from the failing relay was brighter than that of the others, and when looking closer it also had a small brown spot and a hole. I think I only used the multi-meter after I had identified the suspected relay. I simply checked if the resistance between the various pins was similar to some of the neighboring relays, and it clearly was not (but as it was still soldered in the PCB there could be other reasons for that)
Good luck with the repair
Lars
LarsWH -
