SIEMENS HB550550B temperature issue

[Sparkydude]

Morning all, I do a few repairs for an oven cleaner, and he has sent me details of a client whose oven is not getting to temp even thought the display is saying it is upto temp. It is a Siemens HB550550B . I have looked at the exploded diagram and it seems to use a PTC as opposed to a normal vial type thermostat. Is it just a case of swapping the PTC over or could it be more serious ?? i see it has a PCB brains , so hoping its not that and if it is does she need to get a siemens engineer to fix it rather than me.

Any advice greatly appreciated .

Nick

[electrofix]

well the short answer is maybe

without access to Bosch tech info ( and its hard to get ) then you dont know the value of the ntc for a given temp

so you would have to fit one and hope as it could be the board

At about £50 its a hard call ( slighly cheaper on some trade sites and you can get 25{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} trade discount from Siemens but then have to pay postage )

Dave

[kaibart]

Change the fan motor blower motor they call it that more than likely the problem ive changed loads

[Sparkydude]

kaibart wrote:Change the fan motor blower motor they call it that more than likely the problem ive changed loads

Thanks for that , which ones are the likely cuplrit as the diagram shows 2 , 1 in the back and one on top .

[andyjawa]

Think he is means the blower motor fan since the other one is called a fan motor. So the blower fan will be the back one, part number 00490541 at a mere,…..drum roll…. £209.39. Question is was the single oven cleaned then had the problem after a day/week or is that completely unrelated? When I used to follow a cooker cleaner around (a lot!) it was mostly the element that had split ( it had actually already split but just got cleaning spray in the split or had a hot spot but it is always someone elses fault (“the cooker cleaner caused it” – all the usual customer boll*cks, some are deluded some just plain lie, the more wealthier they appear the more its the latter!) = either went bang or never reached the heat because element was on verge of failure so you might want to double check. Part number 00443526 £29.80.
This is based on the model version HB550550B/01 since you didn`t state the 01 bit.

[Sparkydude]

Thanks for that , the oven is the /02 model. I will check the element when i go to site. it seems this oven has various settings so will get her to check if the fan oven element is failed then could be the culprit. Co incidentally it was the oven cleaner whos called me in.

LoL

[Author]

Posts