Question about Bosch HBN 442 / HBN446 Electric Single Oven

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I have a Bosch HBN 7305.0 B oven. last night while grilling some fish the display changed to ERR: 15. I now have the oven locked shut and am unable to remove the food. How do I open the oven door because I will not be able to get in touch with a local (Jersey) service engineer before Monday morning.

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SOURCE: fan oven not heating, bosch hbn 202t

the fan oven element is separate from the grill element. the problem is that the circular element round the fan is blown. remove the back panel of the oven and you will see the element. replacement is easy. on most bosch, the element is removable from inside the oven but for some you have to remove the oven and take off the back casing

Posted on May 04, 2007

  • 1 Answer

SOURCE: My Bosch HBN 5605 .0B oven has a 15-20 degree

I detected a similar problem following the sudden appearance of Err1 in the display. (Oven 4-5 years old, and the grill element failed when it was 3-4 years old). This indicated a temperature sensor problem. My local dealer came with his Thermocouple and confirmed an "under temperature" reading on the standard and baking settings. I agree that the fan setting is probably OK. He replaced the sensor. I monitored the situation for a while and was not happy because an under temperature could be quite dangerous when cooking certain foods, and also causes problems when baking bread.

The location of the oven sensor is also a problem because it is at the top right by the grill which also serves as the top heat source.

I had corresponded with Bosch about this and their response was, frankly, less than satisfactory. In the end I decided to call out their engineer (cost £85-ish) who wired my oven up to his computer. In the end he said that the oven was working as it should be (despite it taking a very long time to actually reach the target temperature of 200C.

In my view of I want 200C, then I should get 200C, not an approximation.

Interestingly the secret info (not in the manual) is that the temperature bar readout does not indicate that it has reached the actual temperature, but may be 90% of the temperature (so if you want 200C you get 180C.

An unsatisfactory solution is to get an oven temperature of the meat probe type and put that in the oven, then you will get a more accurate reading of the temperature. You would need one that goes above 200C (my first one only goes to 200 but I have found another that goes to 250C). Mine is by CDN model DTP482, any good cook shop should stock this.

Andrew Finch

Posted on May 05, 2010

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I detected a similar problem following the sudden appearance of Err1 in the display. (Oven 4-5 years old, and the grill element failed when it was 3-4 years old). This indicated a temperature sensor problem. My local dealer came with his Thermocouple and confirmed an "under temperature" reading on the standard and baking settings. I agree that the fan setting is probably OK. He replaced the sensor. I monitored the situation for a while and was not happy because an under temperature could be quite dangerous when cooking certain foods, and also causes problems when baking bread.

The location of the oven sensor is also a problem because it is at the top right by the grill which also serves as the top heat source.

I had corresponded with Bosch about this and their response was, frankly, less than satisfactory. In the end I decided to call out their engineer (cost £85-ish) who wired my oven up to his computer. In the end he said that the oven was working as it should be (despite it taking a very long time to actually reach the target temperature of 200C.

In my view of I want 200C, then I should get 200C, not an approximation.

Interestingly the secret info (not in the manual) is that the temperature bar readout does not indicate that it has reached the actual temperature, but may be 90% of the temperature (so if you want 200C you get 180C.

An unsatisfactory solution is to get an oven temperature of the meat probe type and put that in the oven, then you will get a more accurate reading of the temperature. You would need one that goes above 200C (my first one only goes to 200 but I have found another that goes to 250C). Mine is by CDN model DTP482, any good cook shop should stock this.

Andrew Finch

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