Thermador’s Pro Grand commercial-depth line includes the PRD364WDGU, a 36-inch dual-fuel range. Gas feeds the cooktop (four open burners with a non-stick griddle), while electricity feeds a 5.7 cu ft oven with True Convection and six further modes. A burner or griddle complaint is therefore a gas-side repair, and bake, broil, or convection trouble is electric-side; the two rarely share a cause.
Cabinet depth matters for parts: 27 7/8” here against the usual 24 3/4” gives the oven more room than the standard-depth PRD364WDHU has. Keep that in mind if you compare the two.
Open flame changes the order of work: a burner or griddle that fails to light, plus any gas odor, sends us to the range’s gas valve before any other diagnostic step.
Gas. It is fed from the cooktop's gas supply along with the four open burners rather than heated by an electric element, so a cold griddle is handled like a burner that will not light.
Not automatically. The two share a dual-fuel layout and burner count, yet the WDGU's deeper cabinet means a 5.7 cu ft oven versus 4.9 cu ft on the WDHU, so match oven-cavity parts to the exact model number.
Because the oven is electric, we check its element and control side, not the gas system. The cooktop is a separate check. The gas cooktop and griddle are checked as their own, separate job.
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