Question about Bosch HGS442UC Gas Kitchen Range

3 Answers

Bosch HGS442UC Gas Oven won't light

Igniter activates and glows red for minutes. Gas does not turn on to burner. No sign of a t'couple close to igniter to cycle on gas valve. Range top works fine so natural gas connection is good. Only have install & operation manuals. Any advice/guidance is appreciated.

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  • chill4 Jul 18, 2008

    Thanks, that helps. I assume there is a sensor near, or maybe part of the igniter, that confirms ignition is on before turning on the gas valve. The igniter is glowing (perhaps not strong enough), but the gas valve is not opening. Wife complained of intermittent operation over last week, so seems to have been a progressive failure, not instantaneous. It would be worth swapping out an igniter if there is a reasonable chance that is the cause, but if not, I need to move to the next step. I assume the "safety valve" is integral to the gas valve. Not sure how easy it is to get to.

    Any more thoughts? Thanks.

  • chill4 Jul 18, 2008

    Problems with the glow bar system.....You may even see the orange "glow plug" (called a hot surface igniter) glowing orange and so assume that it's OK. Not necessarily!! You have to measure the current/amp drawn by the igniter and compare it to this repair sheet before you can say it's OK or not. The gas valve has a bi-metal that open when a certain amount of current flows through it to heat it up. The igniter is wired in series with the gas valve. As the igniter gets older or weaker, it's resistance increases to the point where not enough current is flowing to the gas valve bimetal to open it up. As a result, the gas valve never opens up. BTW, a common symptom of the early stages of this problem is erratic temperature control in the oven due to delayed firing of the bake burner while cooking.

  • ruthopp Jan 04, 2009

    The range works fine, the broiler works fine, the oven worked fine yesterday, but today the oven isnt lighting.

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Usually when an oven won't bake, it's because the bake igniter is weak or burned out. The igniter is a small, round or rectangular device, that's about 1 inch by 4 to 8 inches. It's near the burner itself.

The burner is the tube-type device the gas flows through before it's ignited. It has many small holes on the sides to let the gas, when ignited, form a long, low flame. If the igniter is weak, if it glows red but doesn't get hot enough, or if it's burned out, the gas doesn't flow to the burner and the burner won't ignite. If this is the problem, you may need to replace either the igniter or the gas safety valve. Usually the igniter is to blame.

Other causes Other reasons that your oven may not bake are:

  • The clock settings are incorrect (if you have timed baking or a self-cleaning oven).

  • The thermostat is defective.

  • The safety valve that prevents accidental gas flow is defective.

  • The selector switch is defective.
if this helps please vote me a fix ya

Posted on Jul 18, 2008

  • chad Alves Jul 18, 2008

    also check the oriface on the valve make sure its not blocked,but it sounds like the cylinoid on the valve is junk,you have to replace the valve,un thread ,pipe wrench on pipe,to brace pipe as you unthread ,when you put new valve on put teflon paste for gas,on thread and screw on,if this helps pleas vote a fix ya

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Just repaired my Bosch rangeHGS255UC/02 - would not heat up in bake mode. Replaced the hot surface ignitor. Fairly simple task.

Posted on Jul 23, 2010

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I have a bosch oven eight months old. my wife has baking experience of forty years.in this oven cakes and other baked items will not rise satisfactorily. bosch engineer came out and replaced back plate, still no good. any suggestions?

Posted on Mar 18, 2010

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One thing that you can try(be very careful doing this) is to give the gas control valve a light tap with something hard like a wrench when the oven is turned on and the igniter is glowing but the burner is not on. You will need to remove the broiler/storage drawer at the bottom of the oven. Once you pull the drawer out you should see the gas control valve at the back of the range. Try turning on the oven and lightly tapping the valve housing after the igniter is fully on. This may loosen up any debris inside the control valve housing that might be causing the problem. If the oven burner comes on then try completely turning the oven on and back of several times. And when I say completely I mean turn it on after the igniter is not glowing and burner has shut off. This works about 30% of the time. If the burner control valve sticks again after trying this procedure(burner does not come on) then it could be the control valve and/or the hot surface igniter defective. The hot surface igniter would need to be disconnected from it's harness and tested with an OHM meter. Most igniters should have a 500 to 700 OHM reading. If you get a reading that is way off then the igniter is defective and replace it. If the igniter tests good then the gas control valve is suspect and replace it. Most appliance parts retailers will test your igniter for free. When the igniter is on it should glow very brightly. If it is dim then that is a sure sign it is bad. You can also verify that the oven run-away valve is not closed. This valve will be located at the back bottom of the range at the gas regulator. There will be a tab on the regulator housing where the gas pipe goes to the oven. This tab will lift up to close gas flow to the oven. Sometimes these valves can stick causing the oven to stop working. You can try moving this tab back and forth to see if it loosens any debris in the valve. Move the valve while the oven is on and you will be able to hear the burner come on after moving the valve if that was the problem.

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