The F13 error on your Indesit Washing means the machine has detected a fault with the heating system’s temperature sensor (NTC probe). Before calling an engineer, a few checks around the sensor wiring and connections can often clear this fault yourself.

Error code F13
Meaning Heater temperature sensor (NTC) circuit fault
Severity Medium — the machine won’t heat water properly until fixed
Time to fix 20–45 minutes
Tools needed Multimeter, screwdriver

What the F13 error means

F13 points to a problem in the circuit linking the control board to the water heater’s temperature sensor, known as the NTC thermistor. This component tells the machine how hot the wash water is so it can regulate heating cycles correctly. If the signal from this sensor is missing, inconsistent, or out of range, the control board raises the F13 fault and usually stops or skips heating to protect the wash.

This is similar in concept to sensor-related faults seen on other models, such as the Indesit Washing F04 Error Code, where a component’s feedback signal to the control board fails.

Common causes

  • Loose or corroded wiring connector at the NTC sensor
  • Faulty NTC temperature sensor itself
  • Damaged wiring harness between the sensor and control board
  • Water leaking into the connector housing causing a short
  • Failed heating element affecting sensor readings
  • Control board fault (less common)

How to fix the F13 error

  1. Power down and unplug the machine. Always disconnect from the mains before opening any panels for safety.
  2. Locate the NTC sensor. It’s usually attached to or near the heating element at the back or underside of the drum housing, depending on the model.
  3. Check the wiring connector. Unplug and reseat the connector on the sensor, checking for corrosion, moisture, or loose pins.
  4. Test the sensor with a multimeter. A healthy NTC sensor typically reads a specific resistance value (check your model’s service data); infinite resistance or zero ohms suggests it needs replacing.
  5. Inspect the wiring harness. Look for chafed, pinched, or water-damaged cable between the sensor and the main control board.
  6. Replace the NTC sensor if faulty. This is a low-cost part and usually clips into place, making it a straightforward DIY replacement.

FAQ

Can I still use my washing machine with an F13 error showing?
It’s best not to. The machine may run cold washes without heating, but leaving the fault unresolved can lead to further heating system damage.

Is the NTC sensor expensive to replace?
No, NTC sensors are generally inexpensive parts, and replacement is often a quick DIY job once you’ve confirmed it’s faulty with a multimeter test.

Will resetting the machine clear the F13 code?
A power reset may clear the code temporarily, but if the underlying wiring or sensor fault remains, the error will return on the next wash needing heat.