Question about Bosch HBN 452 / HBN 456 Electric Double Oven

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Upper Oven Heat Lamp Stay On All The Time

After two years of flawless performance, the upper oven Heat lamp now stays even when the oven is off. What does this mean?

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5 Suggested Answers

SOURCE: Bosch HBL 645 Convection Oven -- No Heat

first out put voltages measures,when output voltages ok , then see the control circuit.after tnat every thing ok. replace heating elements.

Posted on Dec 11, 2007

  • 3463 Answers

SOURCE: need selector switch for upper

If you are in the u/k, then try these sites



If elsewhere, then type in BOSCH SPARES in the your browser bar, and you should be able to find someone who supplies Bosch spares.

Posted on Feb 06, 2010

Testimonial: "USA"

  • 43501 Answers

SOURCE: My HBL452 double oven is slow to heat both upper

If your electric2_bing.gif oven is not heating then you probably have a bad heating element in your oven. This is not that hard to fix yourself...
Check out this tip that I wrote about the Oven not heating problem..

Oven Problems Electric2_bing.gif Oven is Heating Slowly or Poorly


Posted on Jul 30, 2010

  • 414 Answers

SOURCE: I purchased a microwave/convect oven combo last

Ensure that the clock is set and that is not in auto mode, the clock is only linked to the main oven and therefore it will not opearte if the clock is not set correctly, all the best

Posted on Sep 05, 2010

  • 1140 Answers

SOURCE: We are trying to replace

Hello Graham,

The lenses unscrew anti-clockwise, but they can be very stiff and difficult to grip. The best advice I can give you is to double or triple wrap a thick elastic-band around the lens as this will give you much better grip than you will get on the glass alone.

If you are still unable to unscrew the lens, squirt a small amount of WD40 / penetrating fluid down the back of the lens so it runs onto the threads and leave it for 15-20 minutes then try again with the elastic-band grip. Once the lens moves a small amount it will unscrew relatively easily. The constant heating and cooling of the oven causes them to lock.

Please switch off the power supply to the oven before replacing the bulb and make sure you have clean hands when replacing the bulb - grease from your fingers can cause the bulb to fail or shorten its life considerably.

Hope this helps. If you are still unable to unscrew the lens, please let me know.


Posted on Apr 12, 2011

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It is common to have the broil element pulse on or they will send 120 volts to the broil element to even the heat in the oven. Some ovens have a preheat function that will power the broil and bake simultaneously until the oven reaches temperature then the broil element will shut down. If they both stay on red continuously through the entire bake process then something is wrong. Probably a stuck contact on the control.

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Check that the bulb is screwed in properly, as this can give the same symptons.

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1 Answer

My HBL452 double oven is slow to heat both upper

If your electric2_bing.gif oven is not heating then you probably have a bad heating element in your oven. This is not that hard to fix yourself...
Check out this tip that I wrote about the Oven not heating problem..

Oven Problems Electric2_bing.gif Oven is Heating Slowly or Poorly


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I have a Magic Chef Chateau Gas range. The upper oven does not heat properly. It comes on, but never gets up to operating temps.

you could have a bad ignitor check that it is actually igniting the gas and you can see flame, also check the cavity sensor a probe that sticks into the oven at the top usually on the left top corner but if the bake cycle works with good results them it is ok
check for flame when it starts give it a mibute to ignite, if it does not then you need to replace the broil ignitor.

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HI. the oven control will interrupt normal actions if it senses an abnormal oven temperature. this can be caused by a faulty RTD(temp sensor), and, also, a faulty relay board if present.

Replace relay board, if present, or oven temperature sensor (RTD). Check sensor harness to make sure it is in good condition.

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1 Answer

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The control switch may be bad on it. If there are 2 elements on the top, they both are not bad at the same time.Check to see if the wires have not burned off the control switch first. Check to see if your breakers are O.K. Turn them both(maybe 3) off and then reset.

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On my double oven the bottom door was not closing by at least 21/2 inches the upper door would allow the light to stay on . Upon close examination this problem appeared to be the door was too low which did not allow the gasket to seat in the oven cavity, holding the door open. new hinges and receptors did not resolve this condition.This is how I corrected this condition. 1 open the doors one at a time and lock the hinges.2 remove the doors from the receptors (be careful they are heavy) and set aside. 3 remove mounting screws holding oven in cabinet. 4 slide oven forward enough to hold onto receptor sockets on left and right sides lower and upper 5 remove receptor sockets by removing the screws in front of oven(be careful to hold on to the receptor so it doesnt fall behind oven into cabinet)7 with a center punch punch a start point 1/8 inch above the existing screw holes and drill appropriate size hole for screw THE HOLES MUST MATCH UPPER AND LOWER RECEPTOR OR THE SCREWS ON THE LOWER DOOR WILL SCRATCH THE UPPER DOOR .8 attach receptors to oven in new holes 9 slide oven back into cabinet and replace screws removed in step three 10 attach doors into receptors and push locks forward into receptor cavity attach lower door first and check for operation then upper door open slowly and check enough clearance exists for the screws on the lower door miss the upper door . If more clearance is needed elongate the holes drilled earlier(repeat steps 1 through 5) and slide receptor up on upper door. NOTE The receptors are not in a sealed space in the oven cavity and are not exposed to any heat. Periodically check the screws for tightness. After performing this procedure Both doors close all the way and the light is no longer a problem Now 20 minutes cook time MEANS 20 MINUTES COOK TIME.

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