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Slightly bizarre problem with our Bosch Frost-Free fridge Freezer KGU35115GB/01
The freezer section was iced up which I put down to the door having been left ajar a few times. With Christmas over we decided to completely defrost it for 48 hours. Now we’ve come to plug it back in it seems to reset itself every 30s.
The lights come on I hear the fan start and the compressor start and then about 5s later there’s a click all the lights go out, come back on again and the whole cycle starts again. Now the bizarre thing that I’ve just discovered is that if I leave the freezer door open it doesn’t reset itself. The fridge gets cold, but as soon as I shut the freezer door it starts resetting itself every 30s.
Any ideas folks, does this sound like new control board time and if so how much do they run too for this model ❓
Update: Having left it running like this for an hour, there’s ice crystals on the backwall of the fridge so that’s getting cold. I’ve now shut the freezer door and it seems happy. No longer resetting itself.
What gives? Do I consider myself lucky and ignore it or is this a warning sign of something on the way out?
cheers
Bruce
Re: Bosch Frost-Free KGU35115GB – resets itself
Well, it’s been on for 18 hours now. The fridge is down to temperature but the freezer is only at -10.
As far as I can tell the freezer fan is running. It ceratinly sounds like it is, but obviously it stops as soon as I open the door. Can I just use a magnet to fool the switch and confirm that it does actually run?
Re: Bosch Frost-Free KGU35115GB – resets itself
Well after 24 hours of being on it started resetting itself with a click every 30s. Have checked the control board which seems substantially different from the KGV model discussed on here a lot.
The sensor connector on the RHS of the control board is a 8 way connector block with only seven of the connectors used.
The wires on the left and appear to relate to the magnetic freezer door sensor. I’ve confirmed that this goes open/closed circuit when the door is open/shut.
The other wires appear to be the temperature sensors from around the fridge/freezer. They come in as four separate twin-core blue/brown cables. The blues are all connected together in to one connection into the eight way block and the brown wires from each sensor get a separate connection each in the eight way block.
I’ve measured the resistance between the common blue connection and the brown connection for each sensor and they’re roughly similar (6.50/7.15/7.04/6.43 KOhm) which makes me think the sensors are OK as they’re consistent with each other when they’re all at room temperature.
The oddity does appear to be the freezer door sensor. As soon as the freezer door is shut it triggers the reset cycle. With the freezer door open the compressor seems happy to run and the fridge section chill sdown nicely. As an experiment i’ve removed the magnet from the top of the freezer door which at least means I can shut it without triggering the thing to reset itself every 30s. I’m assuming the downside of this is that the freezer fan will never come on if it believes the door is open?
For the time being I’ve left it running like this to see if it gets down to temperature. Does this sound like a failed control board? If so I’m happy to replace it.
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