Question about Bosch HBN 131560B / 131520 hot-air Electric Single Oven

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Electronic ignition system failed

After cleaning the top part of the gas cooker the electronic ignition system doesn't work anymore, this has not happened before, the product is around 7 years old.
There is NO CLICK at all and wonder what has happened.
Can anyone give me any practical advice please?
Thanks
Pete

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Electric ignition. Electric goes to ignition button, then to a spark generator, where upon a spark is produced. If any part of this sustem is wet, then it is shorted to earth. No spark.

Posted on Feb 11, 2009

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I am not familiar with your model of cooker but I assume it is a gas cooker.

Gas cookers have safety devices in the oven and grill the hob rings do not need. I speculate even the domestic oven hasn't escaped the interference from the electronics industry and I expect the aforementioned safety devices depend on (low voltage) electronics and electronics depend on electricity - that the lights aren't working would suggest there is no (low voltage) electricity.

Even in the case of an electric oven the thermostat could be electronic and need (low voltage) electricity to work.

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Gas ovens / stovetop that use gas and not electricity. These work by igniting gas and use actual flame on the the stovetop.

Newest cook top styles, such as the induction or halogen cook tops combine the same style to produce more even heating. Some of these ovens feature thermal limiters or thermostats that regulate the burner system.

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The spark igniter tip is dirty (can clean it with either a little wire brush or a piece of fine sandpaper).
2) The Pilot flame is too low, and the tip of the igniter is not in the flame good enough. (the flame acts as a circuit when it touches the tip & completes the circuit).
3) The spark module is no good and needs to be replaced.(But 1 & 2 are your best bet).
spark module does not sense the flame when it's on. The spark igniter is also the flame sensor which provides feedback to the spark module.

Make sure the igniter is properly aligned with the burner lighting holes and it is clean. All lighting holes must be clean too. You can enlarge them using a drill bit one size bigger.

If it would not fix the problem, replace the bake burner and the igniter.
There is a small chance for the spark module itself to be bad as well.

The oven safety valve
(also called the gas valve) is the part that ensures that gas is not released until the igniter has reached the correct temperature needed to ignite the gas. While this part can fail, it is uncommon. If the hot surface igniter does not glow you should first verify that you have voltage to the circuit. This is a live voltage check and should be performed by a qualified person. If voltage is lost at the valve terminals then you should verify the continuity of the bi-metal in the valve using a multi-meter.

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The gas is connected on the rear side of the stove but the pilot light is not lit, nor will it light. trying to trouble shoot the problem before deciding to purchase a new oven/range. Also, I remember...


You may have a pilotless ignition.Check around door frames for model #plate.
Also , open broiler door ,turn on oven and look inside . If you see an orange glow appear after awhile, that is the electronic igniter and you have an electronic ignition(no pilot).In this case the top burners use a spark ignition system.If you don,t hear clicking when you turn on a burner your ignition module might be bad.
Easily fixed though.

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My igniter on the cooker doesn't work, it doesn't click or make any sound


Hi,
Here is a tip that I wrote to give details about why your cooktop will notspark to light the burners..

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Stove top ignitors do not ignite but oven does.


Electric gas igniters sometimes get stuck in one position causing a clicking sound. The clicking sound that you hear is the electric arc that is pulsing from the igniter conductor (wire) to ground (the gas burner). It receives power from the electrical outlet that the stove is plugged into.
Residue from food and sometimes cleaning products may be preventing the igniter from producing a spark (Arc) to the base of the burner. This is a common problem that occurs when the stove has been cleaned or food is allowed to build up. Make sure that the igniter and the burner base are clean and dry. This will help with proper operation. Oven cleaner and a small tooth brush may be used to accomplish this. Another problem with ignition may occur if you have too little (touching) or too much space between the igniter and the base of the burner; it will prevent the burner from igniting. You should only have a little more space than the thickness of a nickel between the burner base and the igniter. A good “blue” arc from the igniter to the burner base is optimal. If this doesn’t work, you may need to replace the electric igniter module. Good luck.

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I replaced what I thought was a bad igniter.But still had no glow from new igniter. Must be something else.Where do I go from here?


Hello there: The oven bake burner and ignition components are located beneath the oven cavity. In most cases the oven bottom panel can be removed for access (check your owner's manual) but on some models the oven burner has to be accessed from below in the warming or broiler drawer area. If accessing from the top, a 'flame spreader' (flat metal plate) above the burner may also need to be removed to see the burner itself.Many ovens use a single oven burner in which case they only have a single gas valve and ignitor. The same burner is used for both bake and broil functions, the broil usually being in the drawer area below the oven. Higher-end models may have a separate bake and broil burner. On such a system there will be two ignitors, one for each burner. They may also employ a 'dual' gas valve (see illustration above) instead of using a separate valve for each burner.Some range models may have an additional broil burner located at the top of the oven cavity which may be referred to as a 'waist high' broil. If not, broiling usually takes place in the drawer area below the oven, which uses the same bake burner for the broil function. Most gas ranges currently available employ one of 3 basic gas ignition systems; pilot ignition, hot surface ignition system (which uses a 'glow bar' or 'glow coil' - aka an "ignitor") and a spark ignition system. The latter two being referred to as "electronic ignition" systems as they use electricity in one form or another to operate the oven heating system. Only the pilot ignition system has an actual "pilot" (which is a small but real "flame") which might need manual lighting.
If the surface burners of a range are a spark ignition type, the oven IS one of the possible kinds of electronic ignition systems and thus will not usually have a "pilot" which needs lighting. Be aware though that just because the surface burners might light via a spark doesn't necessarily mean the oven uses the spark type ignition system too.
There is one older style of electronic ignition system which does also use an oven pilot but it is very rare and such a system hasn't been used in oven models since the early to mid 70's. It is the 'constant pilot' *electronic ignition* system.


Making Observations
The oven burner's operation will usually need to be directly observed while in operation as the first step to troubleshooting problems.Ignition System Type Links
Ignition System Types:
  • Pilot Ignition
  • Electronic Ignition with Constant Pilot (rare)
  • Electronic Ignition with Glow Ignitor (most common)
  • Spark Ignition System

  • Is there continuity between the oven gas valve's terminals?


    Hot Surface ('Glow Bar') Ignition System (most common)
    This is the most popular system currently used for ovens and is comprised of a control mechanism (whether thermostat or electronic control), the oven ignitor and an oven gas valve.


    What happens in this style ignition system is that the thermostat or electronic control switches power to the oven ignitor and gas valve circuit which are connected in series (one after the other). As power flows through the ignitor it heats and draws current (measured in amperage). Once the oven ignitor draws a specific amount of current the oven valve opens to allow gas to flow to the oven burner where the glowing hot ignitor (glow bar) ignites it. Power must continually flow through the ignitor and oven gas valve for gas to be released into the oven burner to create a flame.

    It should usually only take in the area of 30-90 seconds for the oven ignitor to reach the proper resistance to allow the proper amperage to reach the gas valve to open it and for the ignitor to ignite the gas at the oven burner.

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    Sometimes when I clean my cooker, and it gets damp, mine ignites like that. It soon stops after it dries out. Give it chance and see.

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    Modern gas cookers use an electronic ignition switch rather than a pilot light to light the gas for cooking. This means you can light your gas cooker with the touch of one button instead of using several matches or a flint lighter. Of course, you still have the option to light the gas cooker by hand with matches or a flint lighter if the ignition switch does not work the first time.

    1.Open the gas regulator valve by pushing it in and turning it to a low setting.

    2.Push the ignition switch once.

    3.If the gas cooker does not light on the first try, close the gas regulation valve for one minute by pushing in on it and turning it back to the "Off" position.

    4.Open the gas regulation valve, set it a bit higher than you did on the first lighting attempt, and push the ignition switch again.

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