Star burners that won't spark, an ExtraLow that won't hold a simmer, a dual-fuel oven drifting off temperature. We diagnose and repair Thermador Pro Harmony, Pro Grand, and Masterpiece ranges across Littleton and SW Denver.
Thermador builds a distinctive range, and its signature features fail in distinctive ways. These are the calls we get most from Littleton and Ken-Caryl homeowners.
The Star burner is Thermador's calling card, and its four-point flame relies on a specific spark electrode and igniter geometry. When one burner clicks endlessly but won't light, or lights with a weak yellow flame, the usual causes are a fouled electrode, a cracked ceramic igniter, a clogged burner cap port, or a failed spark module that fires all burners at once.
The ExtraLow simmer setting is what many owners buy Thermador for, and it's also what breaks their heart when it stops cycling. ExtraLow uses a pulsing burner that clicks on and off to hold very low heat. If it flames out, stays fully on, or clicks constantly, the culprit is usually the infrared sensor, the burner's flame-sense circuit, or a spark module that has lost its low-power pulse.
On dual-fuel models (Pro Grand and Pro Harmony dual-fuel), the electric oven side brings its own failures: a bake or broil element that has burned through, a failed oven temperature sensor reading the cavity wrong, or a control board that throws an F-code and locks the oven. On all-gas ranges, we more often chase oven igniters that glow but never reach the current needed to open the gas valve.
Littleton sits near 5,350 feet, and gas ranges behave differently up here than at the sea-level bench where they were factory-set. Thinner air means less oxygen per unit of gas, so burners that were never calibrated for altitude can run lazy, yellow-tipped, or sooty even when nothing is broken.
Thermador ranges use fixed orifices sized for the gas type, and while the burners themselves don't require re-jetting for our elevation, the low end of the range, especially ExtraLow, is far more sensitive to a slightly rich or lean mixture at altitude. Our dry Front Range air also hardens burner and oven-door gaskets faster, which shows up as heat loss and slow preheat.
When we diagnose a Thermador range in Littleton, we check flame quality and combustion, not just whether it ignites. Getting the flame right is often the difference between a burner that simmers cleanly and one that scorches on low.
Every visit starts with the same $89 diagnostic service call, credited toward your repair once you approve it.
We pull your Thermador model and serial (Pro Harmony PRG/PRD, Pro Grand PRD/PRG, or Masterpiece) so we can match the right igniter, valve, or board before we touch anything.
We test spark modules, igniters, oven sensors, and gas valves with a meter, and we watch the ExtraLow burner actually cycle rather than guessing from the symptom.
You get a firm price after on-site diagnostics, using OEM-quality, factory-specified parts. Nothing proceeds until you approve it.
We complete the repair, then re-check flame quality, simmer stability, and oven temperature so the range is right before we leave.
Common wear items we stock or source as OEM-quality for Thermador ranges:
Littleton Appliance Repair is an independent shop, not authorized or certified by Thermador. What we bring is focused experience with these exact ranges and OEM-quality, factory-specified parts, without factory-channel wait times. Call (720) 903-2603 to describe your symptom, or book through our online scheduling page.
Quick Answers
Continuous clicking on a Thermador Star burner usually means the spark electrode is dirty or wet, the burner cap is misaligned or clogged, or the spark module is failing and firing all burners at once. Dry the burner and reseat the cap first; if it still won't light, the electrode or module likely needs service. Call Littleton Appliance Repair at (720) 903-2603 for a diagnosis.
Thermador range repair in Littleton starts with an $89 diagnostic service-call fee, which is credited toward the repair once you approve it. The final price depends on the part, such as an igniter, ExtraLow sensor, or oven element, and is quoted after on-site diagnostics. Every part is OEM-quality and factory-specified.
The ExtraLow feature pulses the burner on and off to hold very low heat, so when it flames out or stays fully lit, the infrared sensor or flame-sense circuit is usually the cause. At Littleton's 5,350-foot altitude, a slightly off flame mixture can also make the low end unstable. A technician can confirm whether it's the sensor, the module, or a combustion adjustment.
FAQ
Anything else — call any hour, a real person answers.
We service Thermador Pro Harmony, Pro Grand, and Masterpiece ranges, in both all-gas and dual-fuel configurations, across 30, 36, and 48-inch widths. If you have the model number handy when you call, we can bring the right parts on the first visit.
F-codes on a dual-fuel Thermador oven typically point to a failed temperature sensor, a shorted heating element, or a control-board fault, and the oven often locks out to stay safe. We read the code, meter the sensor and element, and replace only the part that failed rather than swapping the whole assembly.
We use OEM-quality, factory-specified parts for Thermador ranges, including igniters, spark modules, ExtraLow sensors, oven elements, and gas valves. We do not use generic substitutes for safety-critical gas and ignition components.
We cover Littleton, Ken-Caryl, Columbine, Chatfield, Roxborough Park, and the SW Denver metro within about 25 miles. Service visits run daily from 8:00 AM to 6:00 PM, and our phone at (720) 903-2603 is answered 24/7.
Answered 24/7 · $89 diagnostic credited to the repair
Book OnlineReviews
Our built-in Sub-Zero was keeping the freezer fine but the upper fridge zone was sitting around 55. Turned out to be the dual-evaporator setup, exactly what the tech guessed on the phone. Brian had the sealed system diagnosed the first visit, ordered the part, and had us back to normal within the week. He didn't try to sell us a new unit like the last place did.
One of the dual-stack burners on our Wolf range would click and click but never light. He mentioned it's common up here because the burners need to be calibrated for the altitude, which no one had ever told us. Relit perfectly after and he adjusted the others while he was at it.
Fixed our Sub-Zero the same week we called. Fair price, no upsell.
Our dual-zone wine cabinet had drifted so the bottom zone wouldn't hold temp and there was condensation collecting on the glass. They diagnosed it quickly but the part had to come from the manufacturer and took about four days, so we were without it for most of a week. Once it arrived the fix was solid and both zones are holding right where they should. Worth the wait, just be ready for the parts delay on these.
Miele dishwasher wouldn't drain, standing water in the bottom every cycle. Bad drain pump. In and out in about an hour and he cleaned out the filter housing that was part of the problem too.
The door gasket on our 15-year-old Sub-Zero had gotten brittle and it was sweating around the seal. New OEM gasket and it seals like new again. Appreciated that they used the factory part instead of some universal thing.
Thermador wall oven quit heating right before we were hosting. Called in the morning and they got someone out that same afternoon. Bad igniter. He had the part on the truck and we still made our dinner.
Ice maker in our Sub-Zero was making cloudy hollow cubes and barely any of them. He flushed the system, replaced a valve, and now it actually keeps up when we have people over. Nice guy, wore booties in the house without being asked.
Solid work on our Bosch dishwasher, the drain pump had failed. The only thing is the $89 service call fee felt a little steep before I knew they credit it toward the repair. Once I proceeded it came off the bill, so no real complaint, just wish I'd understood that up front.
Our Viking freezer was building up a wall of frost and not defrosting on its own. Turned out to be the defrost heater. Fixed it and explained what was going on so I understood why it happened.
Two burners on our Wolf cooktop wouldn't spark. Tech recalibrated them for the elevation and swapped the igniters. Works better than it has in years honestly.
Warm upper zone on our Sub-Zero, classic apparently. They knew exactly what it was, ordered the evaporator part, and came back to install it a couple days later. Honest and easy to deal with the whole way through.
Not many people around here will even touch a Gaggenau. These guys did, got the control board sorted, and were straight with me about the cost of the part on a unit this expensive.
Miele steam oven throwing an error and shutting off mid-cook. The tech was great and clearly knew the unit, but he ran about 40 minutes behind the window they gave me and I had to shuffle some things around. Fixed it in one visit though and it's been perfect since, so I'd still call them again.
Had them out for our built-in outdoor grill that wasn't lighting evenly. Didn't expect them to do outdoor units but they did and dialed it in for the altitude. Grilling season saved.
Quick, clean, and they answered when I called at 9pm the night before. Dishwasher's draining again.
This was a big one, the sealed system on our Sub-Zero failed and that's a job a lot of shops won't take on. They did it right, used factory-spec parts, and stood behind the work. Given it's a $12k built-in I'm glad I found someone who actually knew these inside and out instead of just replacing the whole fridge.
Wine fridge kept fogging up on the door and the temp was bouncing around. Fixed same visit and no more condensation.