Question about Bosch HBN 455 Stainless Steel Electric Double Oven

2 Answers

Bosch HBN 455 Oven Cooling-Fan Issue

We recently moved to a house that has a Bosch HBN 455 double oven installed. I've noticed that after we have finished cooking (so far only in the top oven), the oven's cooling-fan repeatedly cuts in and out for some time afterwards. I'd expected the fan to stay on, but ours cuts in and out as often as every few seconds, barely getting up to speed before slowing again... and then restarting (sometimes almost immediately, sometimes after a few minutes). Between each change in state I can hear a slightly buzzy electrical click, which I guess is a thermal switch triggering all this. It all sounds kinda odd -- I had assumed that the cooling-fan would simply stay on until the oven had cooled to a certain temperature... and that THEN the thermal switch would trigger (which is how the newer Thermador oven in our old home behaved). Is what we are experiencing normal behavior for this particular Bosch oven? Or is there likely a fault? Many thanks.

Posted by on

2 Answers

Re: Bosch HBN 455 Oven Cooling-Fan Issue

After the oven is switched off, the after-run of the cooling fan is controlled by an electromechanical thermostat switch. The fan can switch back on, due to residual oven heat that accumulates within the oven's outer case and reactivates the cooling fan temperature switch. Considering yours is making buzzing sounds and activates on and off, the fan's thermal switch may have dirty contacts or just be defective and require replacement.

Posted on Oct 02, 2007

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Bosch HBN 455 Oven Cooling-Fan Issue

Our HBN655 had similar issues- the upper cooling fan would cycle on and off on a relatively quick duty cycle until the whole mess cooled off enough and it shut off.
My workaround is to turn the temperature dial off but leave the oven function dial on to BAKE. This seems to force the fan to stay on; then we shut it off a while later and avoid the annoying fan cycling.
(note- 2 years ago, our fan became intermittent, varying speed, etc... for about 2 months before it quit entirely. When that happened, the oven started to heat then the thermal cutout kicked in and the oven shut down entirely. We ended up replacing the fan and that fixed the bug... except now it's starting to act up again...)
(also note- the racks on this beast have a faulty design. if you have a heavy casserole and slide the rack out all the way, it tends push the sidewalls apart and the rack drops. I spoke with Bosch about this and they sent me new racks, no charge... so they know there's a problem. But the new racks don't fix the bug; they just make it harder to reproduce. I have actually had one rack fall with 2 piping hot casseroles on it. Fortunately no one was hurt.)

Posted on Nov 04, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Why wont fan turn off after use in oven bosch model hbn 13n5,1b

It should turn off after a while. The fan is actually the cooling of the case, it runs longer if I have used a higher temp setting. If it does not stop after app. 20 min something is broken.

Sep 03, 2014 | Bosch Ovens

1 Answer


If the cooling fan is constantly running then means thermal overload probably faulty, it has failed in closed position.

Best to get an engineer to help

warmest regards
Richard the Repairman

Mar 30, 2014 | Bosch HBL 455 Stainless Steel Electric...

1 Answer

Bosch HBN 91 Sticky Fan

Yes you can oil the shaft...but the problem is within the bearing itself. You might be lucky and only have to oil it once...but chances are your bearing will sieze again...I suggest you remove and replace the fan.

Dec 02, 2013 | Bosch HBN 9163 GB / 9163 GB hot-air Double...

3 Answers

I have a Bosch HBN 455 double oven with the convection oven on top, and a regular oven on bottom. The unit is about 5 yrs old. We recently ran the Self Clean mode, and it seems like it has malfunctioned...


Do you see any Error Message on the Display?

If not, then it should not be a Concern. More often this could be Thermal Fuse on the Back of the Unit ( On Most Models ) will stop the Broil and Bake from Turning ON. You would just start a bake cycle and the temperature will sit at 100 and something degrees and never raise.appliance.

Let me know, once you check the same.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Dec 28, 2009 | Bosch HBN 455 Stainless Steel Electric...

1 Answer

Bottom oven does not heat up fan works

The element is usually located at the rear of the oven compartment,behind a removeable cover, this is also where the fan is located.
Hope this helps.

Nov 29, 2009 | Bosch HBN 452 / HBN 456 Electric Double...

1 Answer

Bosch double oven, fan and light work but won't heat.

my lower oven wont heat on my HBN 70 got light and fan but no heat

Oct 18, 2009 | Bosch Ovens

1 Answer

Easy off ate all enamel off interior of oven

First off i must say that in your owners manuel it clearly states to not use any cleaning products inside the oven..

Second if the cleaner is now completely cleaned off then when put into the bake cycle it could possibly turn the cleaner into a toxic gas. I would not use the oven i would replace it.

Third having the enamel chip off is not a safety concern. it is merely cosmetic. however refer back to number 2.

Feb 13, 2009 | Bosch HBN 452 / HBN 456 Electric Double...

1 Answer

Bosch hbn s gb

oven element would need model and ENR No. to supply

Sep 16, 2008 | Bosch HBN 9163 GB / 9163 GB hot-air Double...

1 Answer

Inner glass door lower double ove

Many teasons for this to happen, no one has come up with a definitive solution for this,it just happens..
All you can do is have it replaced.

Mar 23, 2008 | Bosch HBN 455 Stainless Steel Electric...

Not finding what you are looking for?
Bosch HBN 455 Stainless Steel Electric Double Oven Logo

3,297 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bosch Ovens Experts


Level 2 Expert

157 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers


Level 2 Expert

224 Answers

Are you a Bosch Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides