Question about Bosch HBN 442 / HBN446 Electric Single Oven

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Bosh HBN 442: The set timer push button not working. Will not depress far enough.

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Common heating faults with Bosch HBN 442 / HBN446 single oven


For all Free appliance repair videos visit our VIDEO TUTORIALS 1, If the Bosch fan motor in the back of the oven is going round and the temperature light is on (normally little red light), but there is no heat then you will probably need a new oven element, these are generally very easy to fit and readily available from our website these can be tested with a electric meter.
To gain access to the BOSCH element you will have to remove the back plate from inside the oven. Once removed you will see the fan and element, if you look closely at the element you will probably see a small hole burnt in it where it has blown. Sometimes however there is no evidence of a fault but the element is open circuit ie: broken inside the element casing, either way it will need replacing. Some elements will are fixed from inside the oven and some are held in place by nuts from the rear of the machine.
2, If your BOSCH fan oven is getting warm but takes a very long time to cook or is burning the food more on one side than the other, then you need to check if your oven fan motor is working you will see the blade turning fast if it is ok. if the element is heating but the fan motor is not blowing the heat into the oven then you need To replace the oven fan motor is a little more expensive and a bit more involved.
3. If you have the opposite problem ie: your oven is over heating and burning everything then you will need to replace your BOSCH oven thermostat
4, A quite common and easily overlooked answer is if your BOSCH oven is not working at all ie: no heat and no fan then the chances are that someone has put the oven timer into AUTO mode, simply put oven back to MANUAL mode and all should be working again.

on Jan 19, 2010 | Bosch HBN 442 / HBN446 Electric Single...

1 Answer

Model HBN 230220A, the clock/timer keeps flashing, how do you stop it and set the clock?


push the clock button then use the plus or minus buttons to change then press clock again

Mar 13, 2015 | Ovens

1 Answer

Oven , light and fan not working new element fitted 2months


Sometimes the timer display fades but still working in background, if all dead now then probably means you need new timer as ovens shouldn't work if clocks not set to manual mode.
Try turning oven on then messing with buttons, usually the 2 left buttons and one far right should do trick.. push 2 left first, keeping them pressed push far right!

warmest regards
Richard The Repairman

Mar 30, 2014 | Zanussi Ovens

1 Answer

Self cleaning


Set back on self clean, then after about a minute, switch off. The lock should disengage.

Apr 25, 2013 | Bosch HBN 442 / HBN446 Electric Single...

1 Answer

My Bosch double oven timer is not working. No clock, notimer, but the oven is working fine.


Sure this is the failure off the unit but make sure that the step down transformer for the power to the unit is faulty or burnt. If so replace the transformer. If power goes tto unit without display then the processor can be faulty . Change the clock timer. unit if you need the timings.

Sep 19, 2010 | Bosch HBN 452 / HBN 456 Electric Double...

1 Answer

I have A Bosch HBN32 oven which has just stopped working all the timers are switched off and the grill still works but the oven only heats up to about 80c the fan still works. any help would be greatly...


ck wiring ( tec sheet inside the panel - there on most bosch a one time thermo / or it may be a resetable one .but you will have to reset it by pushing the red button . this may correct problem . if it does it again look for a over heating porblem like the ( fan foing too slow. ) or temps prob problems. .. mm / hope this helps / feed back pls /

Dec 20, 2009 | Bosch HBN 3550 Electric Single Oven

1 Answer

Bosch oven HBT346 - how do I reset the clock?


Hi after a power cut my Bosch cooker clock is flashing but I cannot reset it as have no instructions - any ideas? Thx

Apr 15, 2008 | Bosch HBN 442 / HBN446 Electric Single...

1 Answer

Lower oven button not working


Yes, this problem is a common one. And it's very easy to fix. Call Bosh support: http://www.fixya.com/Product.aspx?prdid=116504&mode=CNT

Sep 11, 2005 | Bosch HBN 755 Stainless Steel Electric...

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