Thermador PG36 Gas Range/Oven is giving me a 21 flashing error code. Help!

We accidentally poured a fair amount of water onto the range top, which then dripped through the range and down out of the front of the oven onto the floor. Later, the "oven" and "heating" lights started to flash, 2 for "oven" and 1 for "heating." A quick Google search brought me to a Thermador document that says this means 21, or potentiometer, with an error code of E5. But that's where I get lost in the technical information. Any advice would be appreciated!
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