F04
What code F04 means on a Bosch washing machines, what causes it, and which part to check first.
● SEVERITY: MEDIUM
Bosch F04 means: NTC temperature sensor fault. The documented cause is: Failed NTC thermistor. Wiring fault to sensor.
What F04 means
NTC temperature sensor fault
The display shows F04 and the machine stops until the fault is cleared.
What the technical documentation says
Causes documented in the technical source published by whitegoodshelp.co.uk
| DOCUMENTED CAUSE OR CHECK |
|---|
| Failed NTC thermistor |
| Wiring fault to sensor |
Replacement parts
Tools you'll need
Before you open anything
Unplug the machine and close the water tap before removing any panel. Water and mains electricity sit centimetres apart inside a washing machine. If the drum still holds water, drain it from the filter first — it can be scalding.
What to check, in order
From the quickest check to the one that needs a technician.
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Frequently asked questions
What does F04 mean on a Bosch?
NTC temperature sensor fault The documented cause is: Failed NTC thermistor. Wiring fault to sensor.
Can I fix F04 myself?
It depends on the part involved: Failed NTC thermistor. Wiring fault to sensor. Clearing a filter or straightening a hose is within reach of anyone; anything behind a panel means mains electricity and water together — that is a job for a technician.
Does Bosch use other codes on this appliance?
Yes: we document 20 other codes for Bosch on this washing machines. They are listed at the bottom of this page, each with its own meaning.
Does the same code mean the same thing on other brands?
Often not. The same two characters can point to completely different faults depending on the manufacturer — always check the page for your own brand.