Introduction
Water leaks and high temperatures demand fast and expert intervention for any luxury appliance. This combination of failures often suggests a serious blockage within the cooling system. This case study details a recent service call on a Thermador refrigerator T36IB800SP with a bottom freezer in Woodland Hills. The unit suffered from two issues: the refrigerator section was warm, and it was leaking water from the top interior. Certified technicians from Krupo Appliance Repair successfully fixed the complex defrost issue, restoring performance and stopping the leak.
About the Author:
This article is written by the certified Sub-Zero specialists at Krupo Appliance Repair, a trusted name in high-end appliance repair across Santa Barbara and West Los Angeles. We have over 30 years of combined experience and are licensed (License # A48119) and verified by California’s Bureau of Household Goods & Services.
Key Takeaways
- Reported Issue – Thermador refrigerator T36IB800SP warm; leaking water from the top interior; frost buildup.
- Diagnosing the Problem – Defrost system failure, clogged drain line, and stuck evaporator fan motor.
- Resolution – Manual defrost, drain line cleaning, new defrost heater assembly, and replacement of the temperature sensor.
- Successful Repair – Cooling restored, leak stopped, and defrost cycle fully functional.
- Local Expertise – Specialized repair necessary for Woodland Hills homes, addressing common drainage and component failure issues.
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Reported Issue: Thermador Refrigerator Warm and Leaking
A customer in Woodland Hills reported multiple serious problems with their bottom freezer Thermador refrigerator T36IB800SP. The refrigerator temperature was too high. Furthermore, the unit was leaking water from the top interior and showed extensive frost on the evaporator cover. This confirmed a severe blockage and cooling malfunction.
Because water leaking inside a refrigerator often means the melted ice cannot drain, the technician Vlad Frolov, factory-trained specialist, began a careful inspection.
Diagnosing the Triple Failure
First, our technician Vlad Frolov performed a thorough inspection. The diagnosis showed a dual component failure. The refrigerator’s defrost system wasn’t working properly. This caused the excessive frost. Since the frost blocked the melted ice from reaching the drain, water backed up and leaked from the top. Additionally, the evaporator fan motor was stuck due to the ice buildup.
We recommended a full system clear. We needed to install a new defrost heater assembly. Plus, we decided to replace the temperature sensor for reliability.

Step-by-Step Repair Solution: System Reset and Component Swap
To restore the Thermador’s full functionality, our repair process involved specialized steps:
- Component Removal
- We started by accessing the freezer’s interior.
- We removed all shelves and the evaporator cover.
- Defrosting & Cleaning
- Next, we cleared the ice blockage and drain line.
- We defrosted the coils, removed all the ice from the evaporator and drain through, and cleaned the drain line using the steamer machine.
- Component Replacement
- Then, the failed parts were exchanged for new OEM parts.
- We installed the new defrost heater assembly and replaced the temperature sensor.
- Testing
- The new system function was verified.
- We checked the defrost heater and manually confirmed the evaporator fan motor was spinning freely.
- Reassembly
- Finally, the unit was put back together.
- We reinstalled the evaporator cover and shelves, securing all interior parts.
With these critical repairs completed, the freezer is now functioning properly. The cooling is restored and the internal leak has stopped.

Post-Repair Confirmation
The Thermador refrigerator T36IB800SP is operating efficiently after the successful repairs. The drainage issue has been resolved. Therefore, the unit now maintains safe and consistent temperatures. We are proud to be the best service provider in Los Angeles County!
Customer Testimonial
“Very professional service. Showed out exactly on time. His pricing was very fair, Vlad did not try and add unnecessary work. I would highly recommend!” – Lee C., Woodland Hills homeowner.
Verify our commitment to quality. Review all our 5-Star Reviews in Calabasas & West LA now to see real customer satisfaction.
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Conclusion
This case study proves that complex failures, like simultaneous defrost and leakage issues, require Thermador certified expertise. A seemingly simple water leak can hide multiple component failures. By replacing the defrost heater and temperature sensor, Krupo Appliance Repair provided a swift, complete solution. If your luxury appliance is leaking or running warm, schedule service today to prevent further damage.
Schedule Your Thermador Repair Today in Woodland Hills
FAQs
Why was my Thermador refrigerator in Woodland Hills leaking from the top?
The leak was caused by a blocked defrost drain line. Because the defrost system failed, excessive ice formed. When this ice melted, the water had nowhere to go, so it backed up and leaked into the refrigerator compartment from the top.
Why was the evaporator fan motor stuck?
The severe ice buildup caused by the defrost system failure had likely reached and frozen the evaporator fan blades solid. The manual defrosting and replacement of the failed components resolved this issue.
What is the purpose of the defrost heater assembly in a Thermador refrigerator?
The defrost heater assembly turns on periodically to safely melt any frost that builds up on the evaporator coils.1 If it fails, the coils become covered in ice, blocking airflow and causing the refrigerator to warm up.
Is a faulty temperature sensor a common issue in Thermador refrigerators?
Yes. The temperature sensor (thermistor) is crucial. It tells the control board the evaporator coil temperature. If it fails, the control board can’t activate the defrost cycle, leading to icing and temperature swings.2
How long does it take to fix a Thermador with frost buildup and a leak in the Woodland Hills area?
A complete repair, including manual defrosting and part replacement, typically takes 3 to 4 hours. We prioritize efficiency to minimize your inconvenience.
Does Krupo Appliance Repair use genuine OEM parts for Thermador repairs?
Yes. We use Original Equipment Manufacturer (OEM) parts for all Thermador repairs. This ensures the best compatibility, performance, and reliability for your high-end appliance.
What is the benefit of using a steamer machine to defrost the unit?
Using a steamer machine is a fast and safe method. It quickly melts heavy ice without damaging the delicate plastic housing, electronic components, or the cooling fins of the evaporator coil.
Does the intense heat in Woodland Hills affect my refrigerator’s defrost system?
While the heat affects the condenser, the defrost system failure is an internal component issue. However, external heat forces the unit to run longer, making any internal fault, like a failed defrost heater, show up faster.
What is the warranty period for the Thermador defrost repair?
We stand behind our work. This repair includes our strong 12-month labor warranty and full manufacturer coverage on all installed OEM parts.
Do you service other luxury brands like Sub-Zero and Viking in Woodland Hills?
Yes. We are certified experts for all major luxury brands, including Thermador, Sub-Zero, Wolf, Viking, and Monogram, serving the entire San Fernando Valley.