Error code · Washer

ASKO Washer Message “THERMISTOR FAULT”: Water Temperature Sensor Problem

Medium · inspection needed

Code: THERMISTOR FAULT
Appliance: Washer
Brand: ASKO
Warranty: 30-day workmanship

What THERMISTOR FAULT means

On an older ASKO W6641 or W6661, the LCD text display shows a thermistor message when the washer cannot read its temperature sensor. A thermistor is the small sensor that reports the water temperature. Without a reading the washer cannot heat safely, so it stops the program. Power off or a different program clears the message, but it returns if the sensor circuit still has a problem.

Common causes of THERMISTOR FAULT

Thermistor that gives no reading or a wrong one
Connector or wiring to the thermistor
Control input that reads the thermistor

✓ One safe check you can try

1. Turn the power off to clear the message. 2. Start a program again to see whether the message returns. 3. If it does, stop using the washer and schedule service; the owner's manual points to a service technician for this message.

! Why to stop there

A brief power-off can clear the message once, but a sensor circuit that is open will bring it back
We test the thermistor reading and its wiring before we blame the control
Since the washer is older, we confirm the sensor is available before repairing and quote a written price

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Washer codes

E9 / E9.1ASKO W5 Washer Code E9 or E9.1: Water Leak Detected F10ASKO W6 Washer Error F10: Overfilling F11ASKO W6 Washer Code F11: Drainage Error F12ASKO W6 Washer F12: Water Inlet Error FOAMINGASKO Washer Message "FOAMING": Too Much Suds OVERFLOWASKO Washer Message "OVERFLOW": Water Level Too High PRESSURE SENSOR FAULTASKO Washer Message "PRESSURE SENSOR FAULT": Water Level Sensor Problem TEMPERATURE STOP FAULTASKO Washer Message "TEMPERATURE STOP FAULT": Temperature Control Problem

THERMISTOR FAULTTHERMISTOR FAULT questions

What is a thermistor in my ASKO washer?

It is a small sensor that tells the washer the water temperature. The control uses the reading to heat the water and to stop it from overheating.

What happens if I ignore the thermistor message?

The washer may refuse to run programs that need heating. Ignoring the message does not fix the sensor, so a visit saves you from repeated stopped loads.

Is this the same as E1 on newer ASKO washers?

They point to the same area, the temperature sensor, on different generations. The older W6641 and W6661 print the message in words, and the newer ones show a code.

Book a visit

Still seeing THERMISTOR FAULT?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 804-6320