Question about Bosch HBN 745 Stainless Steel Electric Single Oven

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Bosch HBN745 Single Convetion Oven - Fan won't stop & still maintains heat

I have a Bosch HBN745 Oven who's cooling fan will not shut of and it appears as though it is because the over will not stop heating. If it is on a higher temp it will go down to about 100 and stay there, forever. Any ideas?

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  • Bosch Master
  • 3,463 Answers

Sounds like it is the thermostat that is faulty.
Go to your browser bar and type in youtube.com
Then in the search box type in fitting thermostat to oven

Click on appropiate video and follow instructions, this should help with your prob.
Plz rate my solution.
Thanks.






youtube.com

Posted on Dec 31, 2008

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1 Answer

Oven fan not working


If you're referring to the fan in the rear for convection cooking (as opposed to the fan for cooling the electronics), it's replaceable by removing the oven rear panel (power off, of course). Bosch Part 490358

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Common heating faults with Bosch HBL 5032 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 HBL 5032 Electric Single Oven

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Common heating faults with Bosch HBN 430560B / 430520B 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 430560B / 430520B Single Oven

1 Answer

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If the oven is electric and fan assisted,then I would suggest that the oven fan element is faulty.
Plz rate this solution.
thanks.

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2 Answers

My oven turns off on me after only a minute never heating up fully


Could be caused by either of following;

1. Faulty thermostat.
2. Faulty thermal cut out switch. (controls power to cooling fan).
3. Faulty cooling fan (not fan inside oven).

Test thermostat by setting thermostat to low temperature like 60 oC. If oven gets much hotter then its a faulty thermostat.
To test cooling fan and thermal switch take oven out and remove top or rear panels to expose components.
When oven gets hot the cooling fan should turn on. If it doesn't then check to see if there is a mains voltage present.
If mains current exist but fan is not turning then replace fan. If mains voltage is not present then its the thermal switch.

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hope this helps

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