Bosch KGU3220GB – “E1” error message

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  • November 7, 2005 at 3:12 pm #13123
    mhennessy
    Participant

    Hello,

    I wonder if anyone can help. Since moving house, our Bosch KGU3220 has been showing “E1” in the display instead of the fridge compartment temperature.

    As far as I can tell, it’s basically working normally. The freezer temperature is well-regulated, and the display will happily show you the temperature if you press the right button. I’ve put a thermometer in the fridge compartment, and the temperature varies between about 0.5 and 4 degrees. I guess this is ok?

    The freezer temperature is closely controlled by the electronics, but I see that the fridge temperature appears to be regulated by a mechanical device. So am I right in assuming that the display just reports the current temperature?

    Because of the move, I’m assuming that a connector has worked loose in transit. Or perhaps the thermistor for the fridge compartment has somehow broken – from what I’ve read here, it seems they are vulnerable?

    I’d like to double-check all the connectors, so can someone tell me how to get to the display PCB? I’ve tried undoing a pair of white plastic push-in fasteners underneath the top panel, but there is something else holding the panel in place…

    If anyone can shed some more light on how the fridge operates, I’d be grateful. Am I right to assume that the fridge is basically ok, and that E1 just means the sensor is not working? Or is it more serious – do I need to think about getting the removal company to pay up?

    BTW, I am an electronic engineer, and fully aware of the risks involved…

    Many thanks in advance,

    Mark

    November 9, 2005 at 5:34 pm #153251
    mhennessy
    Participant

    Re: Bosch KGU3220GB – “E1” error message

    Hi again,

    Sorry to follow up so soon, but I’ve some new information.

    Last night, I noticed the display had stopped flashing, and said “10” degrees. I checked my thermometer inside, which said 1.5C or thereabouts. As I shut the door, the error code came back again. This has made me all the more certain that I’ve simply got a loose connector somewhere – when it said “10”, this suggests a high-resistance contact had been made (assume an NTC thermistor), and the vibration of the door moving made the bad contact go “high” again.

    Now I’m sure I just need to access the PCB in the top front of the machine to check for dry joints and to reseat the connectors there. Please can someone give me a hint as to how to remove the top panel? Feel free to PM me if you prefer…

    Cheers,

    Mark

    November 12, 2005 at 12:03 pm #153252
    gegsy
    Participant

    Re: Bosch KGU3220GB – “E1” error message

    Hi
    You could try checking if NTC hasn’t come loose in fridge compartment.
    You will find it behind a rectangular block.Quick flick off of cover will reveal NTC.
    E1 is NTC out of tolerance in fridge compartment.
    If the NTC isnt loose then more than likely you need to replace it.
    P/No – 168766 -£14.70 +vat.

    As always, power off before attempting any repair :plug:

    Greg

    November 14, 2005 at 4:01 pm #153253
    mhennessy
    Participant

    Re: Bosch KGU3220GB – “E1” error message

    Hi Greg,

    Many thanks for confirming the E1 refers to the thermister. I’ll have a look at this tonight – I know the cover you mean, as I spotted it the other night, hiding behind the salad tray. Glad also to hear that the NTC is replacable, I was fearing it might be fixed in the foam…

    Thanks again – I’ll let you know how I go…

    Mark

    November 21, 2005 at 5:02 pm #153254
    mhennessy
    Participant

    Re: Bosch KGU3220GB – “E1” error message

    gegsy wrote:Hi
    You could try checking if NTC hasn’t come loose in fridge compartment.
    You will find it behind a rectangular block.Quick flick off of cover will reveal NTC.
    E1 is NTC out of tolerance in fridge compartment.
    If the NTC isnt loose then more than likely you need to replace it.
    P/No – 168766 -£14.70 +vat.

    Hello Greg,

    I finally got the chance to look at this – the thermistor is floating on the end of its wire, so I guess it could have got knocked around during the move…

    Out of interest, I managed to find my way into the control section at the top of the fridge, and identifed the 4 way PCB connector which connects to the 3 thermistors. Of the 3, two had resistance readings in the 30-40K range, and the other (cable with red identifying paint, connected between pins 2 & 4) had a reading of a few hundred ohms. I’m pretty sure this is the fridge thermistor – not only is it quite different from the other two, but the reading jumped around if I knocked the fridge thermistor.

    The thermistor looks like a sealed unit – so to change it, do you cut off the old one and crimp or solder on the replacement?

    Thanks again,

    Mark

    November 21, 2005 at 6:31 pm #153255
    BSH-MAN
    Participant

    Re: Bosch KGU3220GB – “E1” error message

    mhennessy wrote:

    gegsy wrote:
    Hi

    The thermistor looks like a sealed unit – so to change it, do you cut off the old one and crimp or solder on the replacement?

    Thanks again,

    Mark

    Yes

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