The PRD304EG represents one of the earliest documented generations of Thermador’s Pro Grand range line – a 94-page Service Manual published by Thermador exists for this specific model, and Thermador’s own documentation cross-references a large family of related 30, 36, and 48-inch siblings across multiple gas configurations, including PRD364EDG, PRD366EG, and PRD484ECG. This is squarely the kind of old, out-of-warranty range where owners have limited places to turn for repair guidance, even though the range itself was clearly built to be a serviceable, documented product.
Given its age, a service call on a PRD304EG should expect wear-related issues as much as part failure – aging igniters, drifting thermostats, and worn door seals are common simply from decades of heat cycling. If a burner won’t light and there’s any smell of gas, shutting off the gas supply to the range comes first, before any other troubleshooting step, and that safety sequence matters even more on a range this old, where gas-line and valve wear is more likely.
Key Features
- Older 30'' range from Thermador's Pro Grand series, documented in a 94-page Service Manual published by Thermador
- Part of a large early Pro Grand family spanning 30/36/48'' sizes and multiple gas configurations, per Thermador's own manual cross-references (e.g. PRD364EDG, PRD366EG, PRD484ECG, and related models)
- One of the earliest documented Pro Grand generations, well before current dual-fuel WHU/WDHU naming and Home Connect WiFi
Most Common Issues on This Model
Burner not igniting or holding flame
Oven igniter not lighting the main burner, or oven not reaching temperature
Bake or broil temperature drifting significantly from the dial
Door seal degradation typical of a range this age
Aging control parts (knobs, indicator lights, clock)