What sensor can cause F09 fault? Machine stops, clothes are still wet.

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Bosch Dryer

Guides and repair information for dryers produced by Bosch, a German engineering and technology company.

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Hans dusar @hansdusar

Rep: 1

Posted: Jul 6, 2023

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What sensor can cause F09 fault? Machine stops, clothes are still wet.

During the cycle my machine stops running displaying F09 fault. The cloths in the machine are still wet. I can restart the dryers, but sometimes it stops again, sometimes it keeps running till the end. When the machine complete the full cycle, sometime cloths are still not dry however the sensor should measure this. How can I find if the humidity sensor is failing or the over temp sensor is failing or......

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Allen @nest2g Rep: 1.8k 12 4 2 · Answer 1 · 2023-07-06T18:41:19-07:00

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Allen @nest2g

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Posted: Jul 6, 2023

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Doing a search indicates that your dryer temperature sensor has failed. "NTC" broke. Ntc is a thermistor. You should be able to replace it.

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Hey thanks,

I will find how to replace the the NTC, This will be probably the root cause.

I will leave a message when it is replaced.

Jul 9, 2023 by Hans dusar

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H&K @ernufbzxqbflc5r Rep: 1 · Answer 2 · 2026-01-08T17:11:06-07:00

H&K @ernufbzxqbflc5r

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Posted: Jan 8, 2026

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The dry sensor doesn’t work anymore. The dryer turns on timer mode more than 30 minutes. But in for instance iron dry for less than 5 minutes. Then the humidity sensor doesn’t work.

The drum always turned clockwise . Some dust collect between the drum and the contact outside the drum. So there it looks like the clothing is dry . Turn the drum six times anti clockwise and the dust disappears . Start the dryer and he turns already 2 years.

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Bosch Dryer

What sensor can cause F09 fault? Machine stops, clothes are still wet.

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