Two shops turned us down flat once they heard how old the 648PRO is — one of them would not even send a technician to look at it. This company came out, put a meter on it, and had the answer within the hour: the defrost termination thermostat had quit, so the coil never cleared and the freezer side kept climbing. It has sat rock steady since.
Thermador Ranges
Thermador Range Repair for Star Burner Gas & Dual-Fuel Cooking
From a Star Burner that clicks without lighting to a Pro Grand dual-fuel oven that won't hold temperature, we service both halves of your Thermador range with factory-specified parts — and we calibrate the gas for altitude.
Diagnostic fee $89 Credited toward the repair
Service visits Service visits daily, 8:00 AM – 6:00 PM
Service area Castle Rock & Douglas County, CO Roughly a 25-mile radius
Why a Thermador Star Burner Behaves Differently at 6,200 Feet
Castle Rock sits near 6,200 feet, and thin mountain air changes how a Thermador Star Burner burns.
Thermador's patented star-shaped burner port is prized for spreading flame evenly to the edge of the pan and for the ExtraLow setting that cycles down to a gentle melt-and-warm heat. Both are more sensitive to lean, high-altitude combustion than a plain round burner. A range jetted for sea level shows a lazy, yellow-tipped flame, sooting under the pan, or an ExtraLow simmer that starves and goes out.
The cure is rarely a new burner — it's calibration: matching the pressure regulator, burner orifices, and low-flame stop to 6,200 feet, and confirming the flame sensor sees enough heat so the safety valve doesn't cut fuel early. A technician who only works sea-level kitchens often replaces good Star Burner components instead of dialing them in.
Thermador Range Problems We Repair
If your Thermador range does any of the following, it's a service call we handle routinely in Douglas County:
- A Star Burner that clicks continuously but won't light, or sparks the wrong burner
- Weak or yellow flame and an ExtraLow simmer that won't stay lit
- Slow oven preheat or an oven that never reaches the set temperature
- Dual-fuel electric oven overshooting the setpoint, then crashing low
- One burner stuck on high with no true low, or a burner that won't shut fully off
- Gas odor, or a burner valve that keeps releasing gas after it's turned off
- Bake or broil element dead, or the convection fan not spinning on the oven side
- Cracked igniter, stuck spark switch, or a burner cap that won't seat cleanly
Sealed Star Burners & Spark Ignition
On a Thermador range every surface burner shares one spark harness, so a single cracked igniter or a stuck switch can set them all clicking at once. Instead of replacing the whole module on a guess, we isolate the failed position, dry and clean any spillover under the caps, and re-seat and gap each Star Burner head so it lights on the first turn of the knob.
The delicate end of the range is where a Thermador earns its price. A true ExtraLow simmer depends on clean burner ports, correct orifice sizing, and a low-flame setting dialed in for your gas supply and altitude. When chocolate scorches or a sauce won't hold below a boil, that low-flame calibration is usually the culprit — not a dead burner.
All-Gas vs. Dual-Fuel: What Fails on Each
Thermador builds both all-gas and dual-fuel ranges, and the oven side of each fails in a different place. Here's where we look:
| What we check | All-gas range | Dual-fuel range |
|---|---|---|
| Oven heat source | Gas bake and broil igniters, safety valve | Electric bake and broil elements, relays |
| Temperature control | Oven sensor plus gas valve timing | Oven sensor plus control-board relay board |
| Common fault | Weak glow-bar igniter, slow preheat | Burned element, overshoot then crash |
| Altitude effect | Significant — gas oven preheat runs leaner | Burners affected; electric oven unaffected |
How a Thermador Range Service Call Works
No guesswork and no surprise invoice. Every visit follows the same clear path.
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Book & Confirm
Call (303) 801-0060 — answered 24/7 — or use Book Online. We schedule a repair visit daily between 8:00 AM and 6:00 PM, usually same-day or next-day for Castle Rock.
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On-Site Diagnosis
A flat $89 diagnostic service-call fee covers a full inspection: gas pressure, flame quality, igniter and safety-valve function, and oven-sensor accuracy. That $89 is credited toward your repair.
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Clear Quote
You get an exact price before any work begins. Thermador range repairs start from $149, with the final figure quoted only after on-site diagnostics confirm the real fault.
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Repair & Verify
We complete the fix with factory-specified parts, then re-test every Star Burner and the oven cycle — including altitude flame calibration — before we leave.
Straightforward Thermador Range Pricing
$89 Flat diagnostic fee, credited to repair
from $149 Range repairs start here
24/7 Phone answered any hour
8–6 Repair visits daily
Quick Answers
Who repairs Thermador Pro Grand and Pro Harmony ranges in Castle Rock, CO?
Castle Rock Appliance Service repairs Thermador all-gas and dual-fuel ranges — including Pro Grand and Pro Harmony — throughout Castle Rock and Douglas County. We're an independent specialist working since 2014, not affiliated with Thermador, and we use OEM-quality, factory-specified parts. Call (303) 801-0060, answered 24/7.
How much does Thermador range repair cost in Castle Rock?
There's a flat $89 diagnostic service-call fee that's credited toward your repair. Thermador range repairs start from $149, and the final price is quoted only after on-site diagnostics confirm the exact fault — so you approve an exact figure before any work begins.
Why won't my Thermador Star Burner hold a low simmer at Castle Rock's altitude?
At roughly 6,200 feet the air holds less oxygen, so gas burns leaner and a low ExtraLow flame can starve and go out. The fix is calibrating the regulator, burner orifice, and low-flame stop for altitude — something a sea-level technician often misses. Call (303) 801-0060 and we'll dial it in on site.
Frequently Asked Questions
Why do all my Thermador burners click at once when I light one?
They share one spark harness, so a single stuck igniter switch, a cracked spark module, or moisture trapped under a Star Burner cap can make every burner click together. Drying the caps helps briefly, but a persistent all-at-once click needs the failed switch or module isolated and replaced.
My Thermador oven takes forever to preheat. Is that the altitude?
On an all-gas oven it can be — leaner combustion at 6,200 feet slows preheat, and the safety valve may cut fuel early if the flame sensor doesn't heat fast enough. We check gas pressure and altitude calibration first, then the glow-bar igniter and sensor, so we fix the true cause instead of swapping parts.
Do you service Thermador dual-fuel ranges with the electric oven?
Yes. Dual-fuel Thermadors pair gas Star Burners with an electric oven, and we service both — from a drifting oven sensor or a burned bake element to gas-side spark ignition and altitude burner calibration. The two systems fail independently, and we diagnose each on its own.
Can I keep cooking while I wait for the range repair?
If there's any gas smell or a burner that won't shut fully off, stop using the range and call us right away at (303) 801-0060. For non-safety issues like a slow oven or one dead burner, it's usually fine to use the working burners until we arrive.
How soon can a technician come out for my Thermador range?
We answer the phone 24/7 and run repair visits daily from 8:00 AM to 6:00 PM, typically same-day or next-day for Castle Rock and Douglas County addresses. Book at (303) 801-0060 or use the Book Online link to reserve a window.
Ready to Get Your Appliance Fixed?
Call us any time — the line is answered 24/7 — or book a visit online in under a minute. Service visits run daily, 8 AM–6 PM.
Customer Reviews
What Douglas County Homeowners Say
4.9 / 5
4.9 out of 5 — based on 143 customer reviews
Frost kept building along the frame of the fresh-food door on our 48-inch built-in. The technician showed me the gasket had gone hard and lost its memory, and that the hinge cartridge had sagged just enough to break the seal at the top corner. He replaced both, then spent a few minutes explaining what causes it and what to look for later — a gasket that no longer springs back, or a door that needs a nudge to shut. I appreciated being told rather than just billed.
After our kitchen remodel the hood roared like a jet and still let steam hang over the range. Two technicians before this one told us the blower was tired and quoted a new one; neither of them put an instrument anywhere near it. This company went up into the ceiling, found the duct run had been crushed flat where the remodel crew routed it around a new beam, rebuilt the transition, and then actually measured the airflow at the hood so we could see the difference. It is quieter now and the kitchen clears.
Lettuce freezing solid in the refrigerator while the freezer behaved perfectly — that combination had already earned us a quote for a new control board from another company. Our technician opened it up, found the air damper motor stuck wide open so freezer air poured into the fresh-food section, and replaced the damper for a small fraction of that quote. Honest work.
The heating element in our Thermador warming drawer had gone open circuit, so it was doing nothing but taking up space. What stuck with me as much as the repair was the care taken with the house: floor covering down before anything came out of the cabinet, tools kept on a mat, and the kitchen wiped down before he left. You would not have known anyone had been in.
The lower zone of our wine unit had been running warm for a while, and it turned out to be the compressor start relay — diagnosed properly, repaired in one visit, and the bill came in exactly where they said it would. My one real complaint is getting on the calendar: it took over a week from my first call before anyone could come out here, which is a long time to watch a cabinet of wine sit at the wrong temperature. Four stars for the wait, not for the work.