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Thread: FIXED: Bosch HGS235UC/01: even after replacing igniter and gas valve, still no heat in oven

  1. #1
    Join Date
    May 2018
    Location
    Waterloo, ON, Canada
    Posts
    2

    Default FIXED: Bosch HGS235UC/01: even after replacing igniter and gas valve, still no heat in oven

    Model Number: HGS235UC/01
    Brand: Bosch
    Age: 6-10 years

    I have had a problem with our Bosch HGS235UC/01 gas range for some time. When I set it to the oven convection bake or regular bake mode, it would not heat up in normal time. The igniter became red-hot but the gas would not ignite until 20 minutes later; this delay became longer over time.

    The igniter was the main suspect, so I decided to replace it on my own. But, to verify that this part needed to be changed, I tried to measure the current flowing through the igniter, which should be between 3.2 A and 3.6 A (as I understand it). Unfortunately, one of the meter probes with the igniter wires made contact with the metal panels underneath and caused a short-circuit and sparks to fly. This permanently damaged the coil inside the gas safety valve. I ordered a new igniter and new dual gas valve assembly. With great difficulty and effort (German engineering with no access to the screws, requiring dismantling of the whole unit!!!), I replaced these two parts.

    Now, the igniter seems to work fine with about 3.4 A measured through it. Alas, for some unknown reason, the gas valve doesn’t open and as a result, the igniter doesn’t ignite the gas, because it’s not flowing. I’m really baffled because the gas valve coil and the igniter are connected in series, so the 3.4 A current has to flow through the gas valve coil as well, which should open the gas to the oven, but it doesn’t.

    One thing that I noticed is that there’s a blinking red LED light (LED1) on the power board. What does it mean, and is it normal? Maybe, I damaged something on that board.
    Of course, I should mention that the top of the gas range works fine, so there is no problem with the main gas supply. I could check the power board, but I don’t have access to the schematic, nor the service manual. If anyone has it, I would greatly appreciate a copy.

    Also, any ideas are welcome. At this point, I’m quite desperate because it’s the third day that I’ve been trying to fix it, and my wife has become quite upset, as you can imagine.

  2. #2
    Join Date
    Oct 2004
    Location
    Ontario, Canada
    Posts
    22,475

    Default

    Hi,

    Now, the igniter seems to work fine with about 3.4 A measured through it. Alas, for some unknown reason, the gas valve doesn’t open and as a result, the igniter doesn’t ignite the gas, because it’s not flowing. I’m really baffled because the gas valve coil and the igniter are connected in series, so the 3.4 A current has to flow through the gas valve coil as well, which should open the gas to the oven, but it doesn’t.
    Is there gas entering the gas safety valve?

    One thing that I noticed is that there’s a blinking red LED light (LED1) on the power board. What does it mean, and is it normal?
    Not a clue, I don't own a Bosch. What does your use and care manual say about a light?

    I could check the power board
    Why? The board is sending power through the gas safety valve to the ignitor.
    It more sounds like a possible bad new gas safety valve....but definatly make sure gas is entering the gas safety valve.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid
    Yeah I've got O.C.D.....Old, Cranky and Dangerous.
    Tip of the day, set your Samsung Smart Fridge to a foreign language so Google can't spy on you!!

  3. #3
    Join Date
    May 2018
    Location
    Waterloo, ON, Canada
    Posts
    2

    Default

    Thank you very much for the help. Indeed you're correct, gas was not entering the safety valve. I discovered that the shut off switch on the gas regulator had been triggered and was preventing gas from getting into the bake portion of the oven. It's a simple enough thing, but it took me a long time to find it.

  4. #4
    Join Date
    Oct 2004
    Location
    Ontario, Canada
    Posts
    22,475

    Default

    Glad that was all it was!!
    Thankx for the update

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid
    Yeah I've got O.C.D.....Old, Cranky and Dangerous.
    Tip of the day, set your Samsung Smart Fridge to a foreign language so Google can't spy on you!!

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