Question about Bosch 24 in. SGS43C12 Classixx Free-Standing Dishwasher

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Do you have any idea what the problem would be if the dishwasher fails to stop, The digital dial counts down down until 1 and then never drains or switches off, just keeps on going

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Hi there,

The "1" is actually an error code indicating a fault in the water heating circuits. The endless cycle means the water isn't reaching the desired temperature or, in some cases, the controller isn't receiving the correct signal to indicate the water has reached the correct temperature. If the water doesn't reach the desired temperature, the wash cycle wont advance and the "1" will be displayed.

This is usually due to a failing (or failed) water heater or a fault in the control module. Often, one of the pins for the heater relay has burned out on the PCB causing a dry joint. This can sometimes be re-soldered. Occasionally, it can also be a fault with the NTC water temperature sensor (Negative Temperatire Co-effecient), but this is less common.

There are some simple tests you can do without any disassembly or electrical testing.

- If you have an RCD (residual current detector) fitted locally to the dishwasher or in your fuse box / consumer unit, a failing or failed water heater would usually trip this. If an RCD is fitted and is not being tripped, I would start with a visual examination of the solder joints for the heater relay on the control module

- Check whether the water is getting hot. Start a quick wash cycle and leave it to run for about 10-15 minutes. Then open the door and check for the presence of steam and/or test the water in the bottom of the washer by hand. It should be hot, not luke-warm.

These are only simple checks to determine the best place to start looking for the fault. You will still need to do some further testing to find the exact cause of the fault. This will require some dis-assembly of the dishwasher and you will also need a Torx T20 screwdriver and a multi-meter for electrical testing of the water heater.

If you have these tools and would like to try fixing this yourself, please let me know. If you are in the UK, the control module and water heater are about £100 each to replace, so you should take into account of the age of the washer before replacing these. The control module can be replaced fairly easily on a DIY basis, however the water heater and NTC are significantly more difficult and may be best left to a professional service engineer.

If you need further assistance. Please could you also confirm the correct model number of the dishwasher (I don't recall the SGS43C12 having a digital time display) and whether you are on a 120 or 220-240 volt supply.

Hope this helps.


Posted on Mar 21, 2011


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