What F5 Means
WHICH MACHINES THIS APPLIES TO: single-digit F-codes on an Asko washer belong to the US W6441 and W6461. Two Asko Use and Care Guides carry the table identically, one headed "W6461 ERROR MESSAGES" and one headed "W6441 ERROR MESSAGES", and both introduce it with "Error messages will display on the LED if problems occur while a program is in progress" and "To remove the message, turn the power off or change the program". This is not the same scheme as the F10, F11 and F12 used on other W6xxx machines, and it is not the E-series of the later Logic and Pro Home washers. All three are real and none of them translates into the others.
W6441 AND W6461 - WHAT F5 MEANS: the error-message table reads, in full, "This indicates a problem with the thermistor. Call a service technician." The part is named and no owner check is offered.
WHAT THE THERMISTOR DOES: it is the temperature sensor in the drum assembly, and it is the only thing telling the control how hot the wash water is. Every heated program is run by switching the element on and watching that sensor until the water reaches the temperature the program asked for.
WHY THE MACHINE STOPS RATHER THAN CARRYING ON COLD: a heating circuit run without a trustworthy temperature reading is a heating circuit with nothing deciding when to switch off. The control has no safe way to continue, so it does not.
THE RELATED CODE IN THE SAME TABLE: F6 is the temperature stop problem, which is raised when the water does not get hot the way it should. F5 is about the sensor and F6 is about the outcome, and the two are checked differently, so it is worth noting which number the machine actually showed.
WHAT AN OWNER NOTICES: washes that stop part way through at the point where heating should begin, or laundry that comes out clean but cold on the programs where it should not.
CLASSIFICATION: problem, on the sensing side rather than on the heating side.
Common Causes of F5
- Thermistor failed or drifted out of its range
- Thermistor circuit open, at the sensor or in its wiring
- Connector at the sensor loose or corroded
- Wiring between the sensor and the control damaged
- Control unit misreading an otherwise sound sensor
🔧 One Safe Check You Can Try
There is no owner repair here and no published check, so the contribution is an accurate account of the pattern. Note whether cold programs run through to the end while heated ones stop, because that single fact separates this part of the machine from everything else. Note whether the problem appears at the same point in every cycle or at different points, and whether it is constant or intermittent - an intermittent problem that appears once the machine has been running for a while usually means a connector opening as things warm and move, rather than a dead sensor. If the machine is going to wait for a visit, switch it off at the outlet or the breaker and leave it off. Do not open the cabinet to look at the sensor or its plug: on these washers the thermistor sits against the outer tub with its wiring in the same loom as the heating element, the element terminals are live whenever the machine is connected to power, and reaching any of it means working around a spring-suspended drum.
⚠ Why You Shouldn't Go Further Than That
- The thermistor is mounted at the outer tub with its wiring in the same loom as the heating element, which is at mains potential whenever the machine is connected.
- Reaching that area on a front-loading washer means dismantling around a spring-suspended drum rather than removing a single panel.
- A resistance reading on a thermistor is only meaningful with the machine isolated and the connector disconnected, so there is nothing useful to measure on a live machine.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.