Cooling Fan Control Thermostat With Resistor
Genuine cooling fan control thermostat with resistor – identical to the original factory-fitted component for Bosch, Neff and Siemens ovens & cookers as shown unless advised otherwise
Description
This is a genuine Bosch Group cooling fan control thermostat with an integrated resistor, supplied as the same component fitted at the factory, so it mounts on the original fixing points, connects to the existing wiring harness, and controls the cooling fan exactly as the original did.
The cooling fan sits at the rear or top of the oven for one reason: to keep the control panel, fascia, and surrounding cabinetry cool. Without it, the heat that builds up around the oven body during cooking has nowhere to go, and it gradually cooks the electronics inside the appliance.
This thermostat is what triggers the fan. It senses the temperature inside the cooling duct and closes to turn on the fan when the appliance warms up, then opens again as the temperature drops. The integrated resistor provides stepped fan speeds, allowing the fan to run slower at lower temperatures and at full speed when the oven is genuinely hot. When the thermostat fails, the fan either stops running altogether — which is the most common failure and the one that does the most long-term damage — or it runs continuously even when the oven is cold.
This thermostat is used across several Bosch, Neff, and Siemens oven ranges that share the same cooling platform, which is why the same component appears across multiple brands. Because it is designed for a specific switching temperature, mounting profile, and connector layout, it is not interchangeable with visually similar thermostats from other ranges, so confirm the full model number against the compatibility list before ordering.
Technical Notes
Specifications: Genuine cooling fan control thermostat with integrated resistor. Product code: 10006705. Type: temperature-operated switch for the oven cooling fan circuit. Function: switches the cooling fan on when the duct temperature rises and off when the appliance cools; integrated resistor provides stepped fan speed. Supply: 220–240V AC.
Safety note: Isolate the appliance from the mains supply before starting work and allow the oven to cool completely. The thermostat operates at mains voltage and connects directly to the appliance wiring harness — never work on it while the appliance is connected to the power. The cooling duct and thermostat sit close to the oven body and may still be hot long after the oven itself has cooled. Wear insulated gloves and take care around sharp metal edges inside the appliance casing. Before fitting, confirm the replacement matches the original in switching temperature, connector layout, and mounting bracket, and never force a connector that does not seat easily, as this can damage both the thermostat and the appliance harness.
BOSCH COOKER & OVEN
MHS113BA0B/01, MHS133BR0B/01, MHS133BR0B/35, MBA534BS0A/20, MBA534BS0A/35, MBA5350S0B/20, MBA5575S0B/20, MBA5575S0B/25, MBA5575S0B/35, MBS533BB0B/35, MBS533BS0B/20, MBS533BW0B/01, MBS533BW0B/20, MBS533BW0B/25, MBS533BW0B/35, NBA5350S0B/01, NBA5350S0B/20, NBA5570S0B/01, NBA5570S0B/20, NBS113BR0B/20, NBS533BB0B/01, NBS533BS0B/01, NBS533BS0B/20, NBS533BS0B/25, MHS133BR0B/50
NEFF COOKER & OVEN
U1GCC0AN0B/50, U1ACE2HW0B/50, U1ACI5HN0B/50, U1ACE2HN0B/35, U1CCC3AN0B/35, U1GCC0AN0B/20, U1HCC0AN0B/20, U1DCC1BN0B/20, J1ACE2HW0B/01, J1ACE2HN0B/35, J1ACE4HN0B/20, J1GCC0AN0B/20, J1GCC0AN0B/35, U1ACE5HN0B/79, U1CHC0AN0B/79, U1ACE2HW0B/20, U1ACE2HW0B/35, U1ACE2HN0B/25, U1ACI5HN0B/20, U1CHC0AN0B/35, U1CCC3AN0B/52, U1CHC0AN0B/52, U1GCC0AN0B/52, U1ACE2HG0B/52, U1ACE2HN0B/52, U1ACE2HW0B/52
SIEMENS COOKER & OVEN
MB535A0S0B/25, MB557G5S0B/20, MB557G5S0B/25, MB557G5S0B/35, MB557G5S0B/41, NB535ABS0B/25, NB535ABS0B/50, MB557G5S0B/50, MB535A0S0B/52, MB535A0S0B/20, MB535A0S0B/35, MB557G5S0B/01, NB535ABS0B/20
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| Further Description |
Common Faults & SymptomsThe following symptoms are commonly reported when a cooling fan control thermostat begins to fail. Use this as a diagnostic guide before ordering a replacement — if more than one of these is present, the thermostat is the likely culprit. 1
THE COOLING FAN NEVER RUNS AT ALL
The most common and most damaging failure. The thermostat fails open and never closes, so the fan never receives power and the duct temperature continues to rise unchecked. Everything appears to work from the outside — the oven heats, the elements cycle and the display is normal — but the fascia and the control electronics behind it are being cooked from the inside.
2
FAN RUNS CONTINUOUSLY EVEN WHEN THE OVEN IS COLD
The opposite failure. The thermostat contacts weld closed or stick, so the fan runs from the moment the appliance is powered and never switches off. This drains power, wears out the fan motor prematurely and is often the first sign that the thermostat has failed rather than the fan itself.
3
FAN RUNS AT ONE SPEED ONLY
The integrated resistor is what gives the cooling fan a stepped speed — reduced speed at low duct temperatures, full speed when the appliance is genuinely hot. If the resistor has failed open, the fan runs at full speed from the moment it comes on, or not at all. If it has failed short, the resistor is bypassed and the fan only ever runs at one speed regardless of temperature.
4
THE FASCIA, HANDLE OR CONTROL PANEL FEELS UNUSUALLY HOT
With the cooling fan out of action, heat builds up behind the fascia instead of being drawn away. The door handle, control knobs and the surrounding cabinetry will all feel noticeably warmer than they should. This is both a warning that the thermostat has failed and a risk to the electronics behind the panel, which are not designed to operate at sustained high temperatures.
5
THE OVEN CUTS OUT DURING A LONG BAKE
Many Bosch Group ovens include a thermal cut-out in the cooling circuit as a safety backup. If the cooling fan is not running and the internal temperature of the appliance climbs too high, the cut-out trips and shuts the oven down. This is often reported as the oven turning itself off partway through a long bake with no obvious cause.
6
DISPLAY OR CONTROL PANEL BEHAVING ERRATICALLY WHEN HOT
Overheating of the control area is a known cause of intermittent faults in the display, touch panel and control board. A display that dims, flickers, becomes unresponsive or shows garbled segments after the oven has been running for a while may be reacting to heat that the cooling fan should have carried away.
7
BURNT SMELL OR DISCOLOURATION INSIDE THE APPLIANCE
Sustained high temperatures around the control area can cause the insulation on wiring, connector housings and internal components to discolour or give off a faint acrid smell. This is a warning that heat is not being managed properly and that the cooling circuit needs to be checked without delay.
8
FAN STAYS ON LONG AFTER THE OVEN HAS COOLED
A short run-on after cooking is normal, but a fan that keeps running for a very long time after the oven has clearly cooled suggests the thermostat is no longer opening correctly. Left unrepaired, this will wear out the fan motor and add unnecessary running costs to every cooking session.
Fitment GuidanceThis part is compatible only with the models listed in the compatibility matrix above. Even if a part looks visually identical, internal specifications can differ.
Diagnostic TipsBefore concluding that the part has failed, carry out these checks to rule out other causes.
Installation GuideThese steps describe the general procedure. The exact sequence varies between models, so always consult the appliance service manual where available.
Before Ordering, Check These First
Disclaimer: The fault codes and symptoms listed above are intended as a general guide to assist with diagnosis. They cannot be taken as a definitive diagnosis of any particular problem, and other components may produce similar symptoms. Always confirm the fault with proper testing before ordering parts. |
|---|---|
| Alternate Part Number | 5045383488040, BSH10006705, KST 1334 6K9 6 9K |
| EAN Number | 10006705 |
| Manufacturer | BSH |
| Genuine Part | Yes |
Oven Thermostats.
An oven or cooker thermostat controls the temperature inside the oven cavity by switching power to the element within a +/-10-15% tolerance.
Fault Diagnosis
When a thermostat is faulty, symptoms are typically binary: the oven won’t heat at all, or it constantly heats and fails to cut out, resulting in burnt food. Safety thermostats operate similarly but are preset to a single cut-off temperature to prevent overheating.
Technical Testing
Almost all thermostats “break” the live supply once set temperature is reached. If the oven is overheating, the circuit remains closed regardless of setting. If it won’t heat, the thermostat fails to “make” the circuit to power the element.
Electrical Safety Warning
Oven thermostats carry live mains power. They must never be worked on while power is applied to the oven or cooker. Always isolate the appliance from the mains before inspection or replacement.
Sourcing Requirements
When buying a thermostat, precision is crucial. While they often appear identical, they vary significantly in temperature ranges, fitments, and knob offsets.
Can't Find The Thermostat You Need?
We strive to simplify the process. If you encounter difficulties, our team is here to assist. Use our contact page or email as a first resort; we can lookup the exact part and identify cost-effective compatible options for you.
IMAGES AND SIZES ARE FOR ILLUSTRATION ONLY
Parts may vary in shape and size to the images shown as parts are model-specific and subject to change or alteration at any time without notice. This spare part will only fit the models as described in the listing unless specifically advised otherwise by us.
NOTE: Many oven thermostats can be used in different positions and are very specific to the make and model fitting. Please take care when ordering and don't rely solely on images as they largely all look the same!
Technical Component Specialist • Genuine & Verified Alternatives • Established 1988
BSH Group Platform Specialist
Bosch / Neff / Siemens
Spare Parts.
Bosch appliances are produced by the BSH Group, which also owns Neff and Siemens. Many components are shared across these brands and their regional variants, making accurate model identification essential for correct part selection.
ENR-Based Identification Is Mandatory
Almost all Bosch, Neff, and Siemens appliances are produced in multiple variants. To ensure correct fitment, the full model number or ENR number from the rating plate is required. Visual comparison alone is unreliable.
Cross-Brand Compatibility
Many functional components, such as heating elements, motors, switches, and pumps, are shared across Bosch, Neff, Siemens, and other BSH-owned brands. Correct cross-referencing can significantly reduce repair costs without compromising quality.
Variant Sensitivity
Bosch parts can vary significantly by revision, and some genuine components are expensive. Ordering without confirming the ENR can result in incorrect or incompatible parts. When in doubt, verification is strongly advised.
Confirm Your Bosch, Neff or Siemens Spares
Provide the full model or ENR number, and our technical team will check your appliance against the correct BSH platform to ensure exact fitment.
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Delivery & Returns Information.
We aim to get your parts to you as fast as possible. We are transparent about lead times, stock availability, and our returns process to ensure a smooth repair.
Stock Availability
Please be aware that we show availability but do not display live stock levels online. Estimates are based on average manufacturer lead times.
Tradesman Warning
Do not arrange a tradesman until your goods have arrived and been checked. We do not cover tradesman costs due to transit delays or suitability issues.
Understanding Lead Times
Normally a UK stock item. Dispatched same or next working day. Some items may take longer depending on specific warehouse location.
Usually a UK/EU stocked item but with a longer lead time. Contact us before ordering for specific clarification if the repair is urgent.
Factory or Custom order items. These are ordered specifically for you and cannot ordinarily be returned. Please allow the full time indicated.
Order Transit
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Returns Policy
Damages
Report transit damage within 24 hours. Include a photo of the damage and the packaging to speed up the claim process.
Cancellations
You have 14 days after delivery to cancel. This must be done via email or support ticket (not phone/chat).
Exclusions
We cannot accept returns for items that have been fitted for fault-finding, used, or custom-ordered.
How to Return an Item
Contact us with your order number and reason for return.
Wait for instructions and the correct returns address (this varies by item).
Package carefully. Do not deface original packaging. Use tracked post.
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