Bertazzoni Dishwashers F3 Error: Thermistor sensor fault
What Does F3 Mean on a Bertazzoni Dishwasher? F3 is a thermistor (temperature sensor) fault code used on Bertazzoni dishwashers built on the Swedish-engineered ASKO platform. The NTC thermistor monitors wash-water temperature in real time; when the control board detects that the sensor is reading outside its valid resistance range — indicating an open or […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without a working thermistor the control board cannot regulate wash temperature, so dishes will not be cleaned or sanitised correctly.
Can I reset the code?
Yes. A breaker reset can clear a transient fault, but F3 will recur if the thermistor or its wiring is physically damaged.
When to stop immediately?
Stop if you notice: F3 returns after every power-cycle attempt., Dishes remain cold despite the cycle appearing to complete..
Symptoms You May Notice
Wash cycle stops before heated phase
The cycle fills and may begin circulation but never advances to the heated wash stage, stopping early with F3 displayed.
Dishes cold at cycle end
Dishes and cutlery are cold and often still greasy because the heated wash phase never ran.
Possible Causes
Open thermistor
The NTC thermistor resistance has gone out of range due to internal failure, so the control board receives no valid temperature signal.
Requires ProfessionalDamaged thermistor wiring
The wire from the thermistor to the main PCB is broken or has pulled free from its connector, producing an open-circuit reading.
Requires ProfessionalSafe Checks You Can Do
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1
Power-cycle at the breaker
Turn off the circuit breaker supplying the dishwasher for 60 seconds, restore power, and re-run a wash cycle to see if F3 clears.
A persistent F3 after reset confirms a genuine sensor or wiring fault.
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2
Check for prior water leaks under the machine
Pull the dishwasher door open and inspect the tub floor for standing water. A prior leak can corrode the thermistor connector.
Wipe away any moisture and run the dishwasher; if F3 clears it may have been a wet connector.
When to Call a Professional
Contact a qualified technician if:
- Thermistor resistance reads open or far outside the specified range.
- Wiring harness to the sensor is visibly damaged or disconnected.
- F3 persists across multiple resets with no improvement.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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