Thermador professional ranges include standard-depth Pro Harmony and deeper Pro Grand platforms in gas and dual-fuel configurations, plus multiple widths and surface combinations. Burners, griddles, induction modules, steam cavities, and warming drawers can coexist on wider units. The model and exact position of the fault define the diagnostic map.
Identify the exact equipment first
- Pro Harmony standard-depth ranges
- Pro Grand commercial-depth residential ranges
- Gas and dual-fuel configurations
- Wide models with griddle, induction, steam, or secondary cavities
- Photograph the complete Thermador model and serial tag before scheduling service
Protect people, property, and stored product first. Stop for gas odor, smoke, damaged wiring, active leaks near electrical parts, or repeated breaker trips. Leave internal gas, refrigerant, and live-voltage testing to a qualified technician.
Systems that shape the diagnosis
Star burner ignition
Burner seating, ports, electrodes, switches, grounding, valves, and spark controls determine ignition and flame shape. One clicking burner and all burners failing suggest different paths.
Gas versus dual-fuel ovens
The surface may be similar while oven heat differs fundamentally. Confirm fuel configuration before testing igniters, elements, relays, or supply.
Pro Harmony versus Pro Grand depth
Cabinet depth changes oven capacity, installation, access, and some components. Width alone cannot identify the platform.
Optional cooking modules
Griddles, induction sections, steam ovens, and warming drawers have dedicated controls and safety systems. Diagnose each module by mode and position.
How the professional range format changes diagnosis
Record the platform, fuel, width, top layout, affected burner or module, oven cavity, and exact error. Compare ignition and heat behavior across positions. Shut down for gas odor, delayed ignition, flame instability, overheating, or electrical faults.
Repair planning, access, and installation
Pro ranges are heavy, connected appliances that may require gas and high-current electrical isolation. Rear access must account for depth, anti-tip hardware, flooring, cabinetry, and ventilation. Front and top diagnostics should be exhausted before movement is planned.
Why the full model number matters
Pro Harmony and Pro Grand names describe platform depth, but the full E-number identifies fuel, width, options, and version. Record the suffix after the slash because Thermador uses it to distinguish production changes.
Frequently asked questions
What is the difference between Pro Harmony and Pro Grand?
They are different depth platforms with different configuration and installation possibilities. Confirm the model instead of using range width alone.
Why does the burner click after it lights?
Moisture, alignment, electrode condition, grounding, switches, wiring, or flame sensing can keep the ignition circuit active.
Can one module fail while the rest of the range works?
Yes. Griddle, induction, steam, warming, surface burner, and oven systems can have dedicated components even when controls are integrated.
Where should I find the model number before Thermador service?
Use the rating-plate location shown in the owner documentation for the exact professional range configuration. Photograph the complete plate rather than typing a partial number, because suffixes and production revisions can change parts and procedures.
Ghost Appliance Repair is an independent service company and is not affiliated with or endorsed by Thermador or its manufacturer. Brand and family names identify the equipment discussed. Availability of service depends on the exact model, condition, parts support, and location.