Thermador Range Repair Cost — ProGrand & Pro Harmony | Northern Virginia
Quick answer
Thermador ProGrand range repair in Northern Virginia typically costs $250–$900 depending on the fault. A Star Burner igniter assembly runs $250–$480 per zone; an ExtraLow simmer module $180–$350; an oven temperature sensor $150–$300; a thermal fuse $120–$250; a gas valve $280–$520; a convection fan motor $220–$400. The most expensive common repair — the ProGrand main control board — runs $480–$900. Against a $5,500–$9,000 replacement cost, repair wins at almost any age.
A Thermador ProGrand range costs $5,500–$9,000 new depending on width and configuration; a Pro Harmony 30-inch starts at $3,200–$4,800. When a Star Burner stops lighting, the oven fails to reach temperature, or a fault code locks the controls, the question is: how much will the repair cost — and is it worth it? This guide gives you part-by-part repair cost ranges for the Thermador ProGrand and Pro Harmony, explains why Thermador-specific parts cost more than generic equivalents, and lays out the repair-vs-replace math for an appliance built to an 18–20-year design life.
Why Thermador range repair costs more than a standard range
Thermador ProGrand and Pro Harmony ranges use three systems that make parts and service more expensive than a conventional range. (1) The Star Burner is OEM-only. Thermador's Star Burner has a five-point star flame pattern produced by a ring of gas ports that surround a central low-simmer ring. The electrode geometry and port spacing are Thermador-specific: aftermarket igniter assemblies do not replicate the electrode position relative to the star-port gas stream, producing unreliable ignition at low BTU settings that cannot be corrected by adjustment. OEM Thermador Star Burner igniters are the only correct fix. The ExtraLow simmer module — the secondary valve and sensor assembly that holds the flame at low heat without cycling — is equally OEM-only; generic simmer modules produce temperature swings at low settings that defeat the purpose of the ExtraLow feature. (2) The control platform is BSH Thermador-specific. Thermador, Bosch, and Gaggenau all share the BSH Group control architecture at the hardware level, but each brand's control board carries brand-specific firmware, ignition sequencing parameters, and fault-code tables. A Bosch board does not substitute for a Thermador ProGrand board even though they may look physically identical; the ignition timing parameters differ and a cross-brand board installation produces lockout errors within the first heat cycle. Correct diagnosis requires interpreting Thermador fault codes, not generic BSH codes. (3) ProGrand ranges have additional complexity. The 36-inch and 48-inch ProGrand models offer optional grill and griddle inserts that share the same gas manifold as the Star Burners; the 48-inch model also offers a dual-oven configuration with two independent oven cavities. Each additional circuit is an independent failure surface, and a technician servicing a ProGrand 48 must hold the wiring diagrams for both oven systems and all rangetop zones simultaneously.
Thermador ProGrand range repair costs — part by part
Thermador ProGrand ranges (36-inch $5,500–$8,000; 48-inch $7,000–$9,000) are the most-serviced Thermador product in Northern Virginia. Common repair costs by component: (1) Star Burner igniter assembly — the most frequent ProGrand range repair. Each Star Burner zone requires an OEM igniter assembly matched to the star-port geometry; aftermarket igniters cannot replicate the electrode position for reliable low-BTU ignition. Replacement cost per burner zone: $250–$480 parts and labor. A six-burner ProGrand can have up to six independent igniter assemblies; replacing one zone does not require replacing all six. (2) ExtraLow simmer module — Thermador's ExtraLow feature holds a simmer flame at temperatures as low as 100°F without cycling. When the module fails, the burner either extinguishes at low settings or cannot hold a steady low flame. The ExtraLow module ($180–$350) is a separate valve-and-sensor assembly mounted beneath the rangetop; its replacement is a technician job, not a burner-level repair. (3) Oven temperature sensor — the resistance sensor (RTD) measures oven cavity temperature and sends readings to the control board. A failed sensor produces F-series fault codes, temperature overshoot, or an oven that won't heat past a low threshold. Replacement: $150–$300. Temperature sensors on dual-oven ProGrand models are replaced per cavity independently. (4) Thermal cutoff fuse — Thermador ovens include a safety fuse that opens under sustained over-temperature events, most commonly after a self-clean cycle on an oven with a degraded door gasket. Once open, the fuse cuts power to the oven heat circuit; the oven displays no error but will not heat. Replacement: $120–$250. A blown fuse on a ProGrand should always trigger a door gasket inspection — a failing seal is what concentrates heat near the fuse in the first place. (5) Gas valve — the per-zone gas valve controls flow to each Star Burner. A valve that opens partially produces a weak, low flame; a valve that fails closed produces no gas at that zone even with the burner knob fully open. Replacement: $280–$520. Gas valve replacement requires a gas-certified technician and a full leak check after installation. (6) Convection fan motor — ProGrand ovens use a rear-mounted convection fan motor. Bearing wear produces humming or grinding during bake and convection cycles; motor failure produces uneven cooking and can cause element overheating. Replacement: $220–$400. Dual-oven ProGrand 48 models have two independent fan motors; each is quoted and serviced per cavity. (7) Control board — the ProGrand control board manages ignition sequencing for all Star Burner zones, oven temperature calibration, ExtraLow protocol, and the fault-code display. Board failure presents as display errors, multi-zone burner lockout, oven temperature failure, or unresponsive controls. Replacement: $480–$900. Board sourcing requires matching the Thermador part number to the exact ProGrand production-run variant — a board from a different ProGrand generation installs but produces incorrect ignition timing that damages the ExtraLow module.
Thermador Pro Harmony 30-inch range repair costs
Thermador Pro Harmony 30-inch ranges ($3,200–$4,800 new) share the Star Burner system and BSH Thermador control platform with the ProGrand but have a simpler configuration: four burner zones, one oven cavity, and no grill or griddle option. Repair costs are lower at the top end because the single-oven board is less complex and the four-zone gas manifold has fewer valve assemblies. Cost differences from the ProGrand: (1) Star Burner igniter — same OEM-only requirement, same per-zone cost: $250–$480. Four-burner Pro Harmony has a lower maximum igniter replacement cost than a six-burner ProGrand. (2) ExtraLow module — present on all Star Burner Pro Harmony models; replacement cost is the same: $180–$350. (3) Control board — Pro Harmony single-oven board: $380–$750 (lower than ProGrand because the board does not manage a dual-oven system or a grill/griddle circuit). (4) All other components — oven sensor $150–$300, thermal fuse $120–$250, gas valve $280–$520, convection fan $220–$380 — align with ProGrand costs and reflect OEM Thermador parts pricing regardless of model tier. One caution specific to older Pro Harmony models (pre-2016): Thermador has discontinued control boards for certain early Pro Harmony production runs. Before authorizing a board replacement on a pre-2016 Pro Harmony, verify parts availability — a discontinued board changes the repair-vs-replace math even though the range may otherwise be in excellent condition.
Thermador range repair vs replace — the economic math
Thermador ProGrand ranges are built to an 18–20-year design life under normal residential use. The repair-vs-replace calculation is clear when framed against the replacement cost: a $480–$900 control board repair on a $7,000 ProGrand is 7–13% of replacement cost. A $250–$480 Star Burner igniter replacement is 4–9%. Even a $900 board combined with a $480 Star Burner igniter on the same visit totals $1,380 — only 16–19% of the $7,000–$9,000 replacement cost for a 48-inch ProGrand. The 40–50% repair-cost threshold that triggers replacement consideration for budget appliances is almost never reached on a Thermador ProGrand with a single or dual component failure. The Pro Harmony threshold is lower in absolute terms ($3,200–$4,800 new) but the same logic applies: a $750 board repair on a $3,800 Pro Harmony is 20% of replacement cost, not 50%. Three scenarios where replacement becomes rational on a Thermador range: (1) Multiple simultaneous failures across independent systems — control board, a burned ExtraLow module, and two Star Burner igniters on the same service visit on a range over 18 years old. This combination is uncommon before 15 years of normal residential use. (2) A discontinued control board on a pre-2016 Pro Harmony where Thermador no longer supplies the correct part. (3) Physical damage to the star-port gas manifold or the sealed-burner box from impact or flood — structural damage to the rangetop that requires factory replacement of the manifold assembly. For virtually all other Northern Virginia Thermador range faults, the correct answer is: repair it.
When to Call a Specialist
Commonwealth Appliance Repair services Thermador ProGrand and Pro Harmony gas and dual-fuel ranges across McLean, Great Falls, Vienna, Arlington, Fairfax, Falls Church, Bethesda, Potomac, Chevy Chase, and all of Northern Virginia and DC. We carry OEM Thermador Star Burner igniter assemblies, ExtraLow modules, and temperature sensors on the truck for same-visit repair on most burner and oven faults. Same-day diagnostic with a flat-rate fee credited toward the repair. Written upfront quote before any work begins. 90-day workmanship warranty. Call (571) 571-1664.
Frequently Asked Questions
How much does Thermador range repair cost in Northern Virginia?
Thermador ProGrand range repair in Northern Virginia typically costs $250–$900 depending on the fault. Star Burner igniter per zone: $250–$480. ExtraLow simmer module: $180–$350. Oven temperature sensor: $150–$300. Thermal fuse: $120–$250. Gas valve: $280–$520. Convection fan motor: $220–$400. Control board: $480–$900. Pro Harmony repairs run slightly lower at the top end. Our flat-rate diagnostic fee is credited toward the repair. Written upfront quote before any work begins. Call (571) 571-1664.
Is a Thermador ProGrand range worth repairing?
Yes — at almost any age. Thermador ProGrand ranges are built for an 18–20-year service life. A $900 control board repair on a $7,000 ProGrand is 13% of replacement cost. A Star Burner igniter at $480 is 7%. Even combined repairs rarely approach 25% of a ProGrand's replacement value. The only exception is a discontinued board on a pre-2016 Pro Harmony — verify parts availability before authorizing that repair. For all other faults, repair is the economically sound choice. Call (571) 571-1664 for a same-day diagnostic.
Why do Thermador Star Burner parts cost more than generic burner parts?
Thermador Star Burner igniters must be OEM because the star-port flame pattern requires an electrode positioned to Thermador-specific geometry. Aftermarket igniters do not replicate this position; they produce unreliable ignition at low BTU settings that cannot be corrected by adjustment. The ExtraLow simmer module is equally OEM-only — generic simmer valves cannot hold the precise low-flame temperature the ExtraLow system is designed for. OEM parts are the only way to restore correct Thermador Star Burner performance.
My Thermador ProGrand oven won't heat but the burners work — what is the likely cost?
Working Star Burners with a failed oven on a Thermador ProGrand points to the oven circuit, not the rangetop gas supply. The most common faults are a tripped thermal fuse ($120–$250), a failed oven temperature sensor ($150–$300), or a failed glow-bar igniter on gas/dual-fuel models ($180–$320). A control board fault ($480–$900) is less common but produces the same symptom when a relay fails. We confirm the specific fault during the same-day diagnostic. Call (571) 571-1664.
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