Your dishwasher will do this as a safety in case the element is broken and feeding electrical current into the water. Sometimes just a false reading.
Reset your console by pressing: high temp wash, heated dry, high temp wash, heated dry
When all the lights are on you are set in diagnostic mode. Just hit cancel a you will be able to run yourdishwasher as normal.
If this same light appears again then you have a bad element or thermostat.
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Have a great day!
using tape measure measure your item of here is dimensions. you can buy a DW that is 24 inches wide, very easy to do. It is a standard size DW
Width23.875"Depth24.5"Height33.875"
Try a mainboard Reset. Pull the mains plug before bed tonight. Tomorrow, press and hold the on button for 30 seconds, then let go and plug it back in.
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My plan was to see if I could find you a service manual, but strangely, the only reference to that model number is your post here! My guess is the D6 is 'D for Dishwasher' and 'Series 6' or 6 models in that current series.
If the machine has been laid up or little used, check all the connection on the control board. Clean pins and plugs with electrical switch cleaner
https://www.google.com/search?q=DU940QWD6
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Most likely a bad heating element..
https://www.youtube.com/watch?v=am-fhX92rbw
You can call Repairclinic 800# too, and talk with a tech, before throwing parts at it. 800-269-2609.
Best to you.
Miniplayer (i)
We'll also want to shut off the inlet watersupply and disconnect that as well.
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Please refer to youtube " Whirlpool Dishwasher Repair - How to Replace the Pump (Whirlpool # W11032770) "