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Tumble Dryer Exhaust Thermostat

SKU: 421309221081 |
Manufacturer: White Knight

Normally delivered to you in 1 to 4 days excluding weekends and public holidays.

(Delivery from £3.44)

Availability: Avaliable


Quick Overview

Exhaust thermostat situated on the fan duct to fit tumble dryer models listed
Click images to enlarge
Exhaust thermostat situated on the fan duct to fit tumble dryer models listed

Baumatic Tumble Dryer


Kenwood Tumble Dryer


White Knight Tumble Dryer

CL727, CL727B, CL727CH, CL727OG, CL727Y, CL741, CL762, CL767, CL767B, CL767C, CL767OG, CL767SV, CL767SVNC, CL767Y, CL777TS, CL787, CL787B, CL787OG, CL787Y, CL797B, CL797C, CL797OG, CL797R, CL797Y

Tumble Dryer Thermostats

The thermostats in your tumble dryer control the temperature inside the dryer ensuring that the air stays at the preset temperature for each program.

There are several kinds of tumble dryer thermostat employed and each has a different function but, irrespective of function there are three basic types:

  • Normal analogue type thermostat that opens or closes at a preset temperature
  • One-shot or resettable safety devices
  • Electronic sensors which detect temperature by reading resistance

Often when thermostats fail they will do so due to a lack of cool air or a sudden exposure to temperature that they were not designed to endure. You can find out more about the most common reasons that tumble dryer thermostats fail in this article.

Normal thermostats will simply open or close the contacts when the preset temperature is reached in the dryer. These are most commonly used to switch the live supply to the dryer heating element cutting the element in and out to maintain the set temperature.

One-shot safety thermostats are just what they say, they will trip once and not reset so therefore must be replaced to have normal operation of the dryer restored. These thermostats should not, under any circumstances, be by-passed or the dryer used without these being "good" as it can be extremely dangerous and pose a serious fire risk to do so.

Resettable safety thermostats will have a small button on them to press, this resets the thermostat if it is not faulty.

In more modern and more efficient dryers the use of sensors, commonly NTC thermistors, is becoming increasingly popular. These sensors read the temperature constantly using electronic control units and offer far more accurate temperature regulation meaning a more efficient dryer.

Help with diagnosing tumble dyer faults can also be found in out basic fault finding guide for tumble dryers from this link

We also have a short video on how to test tumble dryer thermostats, notes about care when fitting new thermostats and more below.

Can't Find The Tumble Dryer Thermostat You Need, Not Sure?

Buying spare parts for any tumble dryer can range from the simplest task in the world to one of the most daunting as you try to pick your way through model numbers, serial numbers, ranges and all sorts of information.

We try to make it as simple as possible for you to buy a spare part for your tumble dryer but, sometimes we all need a little help from experts.

Below you will find the various ways in which you can get in touch with us about tumble dryer thermostats and get answers as quickly as possible but do please use our contact page or email as a first resort as this allows us time to look up spare parts for you and find any low cost compatible tumble dryer spares as well, so you get the best options possible. 


White Knight

Spare parts help and support forums where you can get help and advice from us about parts for washing machines, cookers, dishwashers, fridge freezers and more

Spare Parts Help

We can assist you directly with identifying spare parts for your appliance from our support help desk and you will also find lots of information to help you locating model numbers, product codes and more where you can even raise and track your own enquiry online

You can also email us on or use the live chat.

If you are unsure if a part will fit your model or you want to confirm any details, just get in touch and we will do all we can to help you.


Appliance help and support forums where you can talk to actual domestic appliance engineers about washing machines, cookers, dishwashers, fridge freezers and more

Help From Experts

Get help from repair experts in our forums, a totally free to use service we provide to all.

Talk to engineers that repair applainces and get support from there with diagnosing faults and repair advice.

To use this function simply login or regiter on the forum, select the forum for the appliance you need help with (for example, washing machine forum for a washing machine question), post your question and, if someone can help you they will do so.


Find a domestic appliance service engineer to repair your washing machine, dishwasher, cooker, oven, fridge or any other major domestic appliance

Get A Repair

Find a local approved service engineer to repair your appliance with no charges to you for the use of this service.

Deal directly with the field service technicians that repair appliances.


More help, advice and information on how you can repair your own washing machines, cookers, dishwashers, fridge freezers and more

More Information To Help You Repair

Find out more about how to repair your appliance and much more from the self help section of our website

We have a huge number of help articles that cover the most common issues and problems with most appliances that you can use to help diagnose the cause of many problems yourself


Additional Information

Further Description No
Alternate Part Number CRO421309221081, MFI421309221081, 5031685286088, 5045174444989, 5031689356787, 66-CS-03, CRS421309221081
EAN Number N/A
Manufacturer White Knight
Genuine Part Yes