Siemens HB15N550GB/03

[rocker]

Customer tells me there was a flash then oven stopped working properly, on checking the top oven floor element has a earth leak, this in turn has blown the tracking on the small Pcb mains power board (part No 00495386) I repaired the tracking but still have same problem.
On testing the top oven grill works ok.
when testing the Main oven the fan element heats up, but the fan doesn’t work there is no positive supply, I traced this back to the main (larger) Pcb (part No 00499014). which is fed from the smaller Pcb.
The problem is don’t know which board needs replacing ( there is no obvious damage on the large pcb) I suspect the smaller is the problem, but I need a siemens expert( if possible) to confirm which part is required, as these parts a bit pricey if I order wrong part.
cheers John

[electrofix]

Re: Siemens HB15N550GB/03

the power supply is just to supply power to the pcb so a short in an element to earth is not going to affect this board unless the main board gets damaged too.
had a similar bosch board go faulty and if you looked carefully you could see a hole in one of the driver chips and that was all

you should be able to verify the voltages on the power board are ok

Dave

[rocker]

Re: Siemens HB15N550GB/03

Hi Dave, Thanks for reply I have since removed the main pub and found one of the relays is blown, it a ( SCHRACK PBH34009 9v DC) have you any idea where I can purchase one, not listed on RS or fernell or equivalent part !!.
thanks again John

[electrofix]

Re: Siemens HB15N550GB/03

have a scrap board in the van will have a look to see if that one of them

Dave

[rocker]

Re: Siemens HB15N550GB/03

ok many thanks.
John

[nomadPaul]

Re: Siemens HB15N550GB/03

Something to watch out for on these ovens if it is the model with the square oven lamp set in the roof of the main compartment. The lamp blowing can take out its relay that then takes out track near to it.
Is the relay on the back left as you look at the board from the front? It might be worth checking the bulb/lamp assembly just in case this is the cause of the ‘bang’ and following relay damage.

[rocker]

Re: Siemens HB15N550GB/03

Cheers for reply, but the lamp assembly is working ok, I am sure the element caused this problem on this occasion. John

[electrofix]

Re: Siemens HB15N550GB/03

have checked the board I have and the relays used are

HF152F 9 volt coil and
HF3FD 9 volt coil

HF152F is a similar size but they seem to have slightly different pin positions to the shrack 3-1415356-1 / PBH34009
if you think you can alter the board to fit it your welcome to one. board has come out of a Neff oven unit so is used in a similar way (part no 658000)

Dave

[rocker]

Re: Siemens HB15N550GB/03

Dave, I Have sent my details to your private messages.John

[Author]

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