Ah, the famous (or infamous) Clean-light blinking problem. Watch that blinking light.... You say it blinks 7 times, pauses, and repeats, right? Well, 7 blinks which means "water not heating error". This could be caused by a bad heating element, a bad thermal cutoff or thermostat, a bad controller, or a problem with the door latch and/or switches. Usually, the most common problem is that 1 of the 2 switches inside the door latch is not getting engaged fully. This may be caused by something getting spilled (like a soda) into the door latch that is making it stick, or the door strike may be weak and not pressing down on the door latch hard enough. If it's the latch, you would need to take the door apart and remove the latch mechanism (unplug the dishwasher first!), remove the switches, and clean the plastic parts with water, dry it, and then re-assemble. The other thing to check is the door strike, which is supposed to push down the latch. The springiness of this metal part may be weak. You can remove that door strike, bend it down more, and then re-install it. Then you need to reset the controller by running a diagnostic cycle. Do that by pressing the following sequence of keys: Heated Dry - Normal - Heated Dry - Normal; or High Temp - Air Dry - High Temp - Air Dry; or Hi Temp Scrub, Energy Saver Dry, Hi Temp Scrub, Energy Saver Dry; or High Temp Wash, Heated Dry, High Temp Wash, Heated Dry). You will know that you have entered the diagnostic cycle when all the lights light up for a few seconds. Let the dishwasher run the diagnostic cycle for a few minutes, and then press Cancel to stop the dioagnostic cycle and clear the error. If the problem re-occurs, then the cause may be a bad heating element or a bad controller.
Note: On some of the newer Whirlpool, Kenmore, KitchenAid dishwashers, you start the diagnostic cycle by rapidly pressing the 3 left-most keys in the following sequence: 1 2 3, 1 2 3, 1 2 3.
Good luck!
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