The F04 error on your Indesit Washing means the machine’s pressure sensor (water level sensor) is not reading the water level correctly. This often points to a blocked pipe, a faulty sensor, or a wiring fault, and it’s usually fixable without calling an engineer.

Error code F04
Meaning Water level (pressure) sensor fault — the control board isn’t getting a valid signal about how much water is in the drum
Severity Medium — the machine may still run but could overfill, underfill, or stop mid-cycle
Time to fix 20–45 minutes
Tools needed Multimeter (optional), screwdriver, torch

What the F04 error means

Every Indesit washing machine uses a pressure sensor, sometimes called a pressostat, to monitor how much water is inside the drum. It does this through a small air-filled tube connected to the tub. When the control board receives an unexpected or missing signal from this sensor, it triggers the F04 error to stop the cycle before water levels become unsafe.

This is different from the Indesit Washing F02 Error Code: Causes and Fixes, which relates to water intake, and the Indesit Washing F03 Error Code: Causes and Fixes, which points to a temperature sensor fault. F04 specifically flags a problem with detecting or reporting water level.

Common causes

  • Blocked or kinked pressure sensor tube (the small hose linking the drum to the sensor)
  • Debris or fluff trapped inside the tube, restricting airflow
  • Faulty pressure sensor unit that needs replacing
  • Loose or corroded wiring connector at the sensor or control board
  • A build-up of limescale affecting the sensor’s accuracy
  • Control board fault, though this is less common than a sensor or tube issue

How to fix the F04 error

  1. Unplug the machine first — Always disconnect power before opening any panels to avoid electric shock.
  2. Locate the pressure sensor tube — Remove the top panel (usually two screws at the back) and find the small clear or white tube running from the drum to a sensor unit, often near the top of the machine.
  3. Check for blockages — Detach the tube carefully and blow through it gently to clear any trapped fluff, lint, or debris. Look for kinks or splits along its length.
  4. Inspect the sensor connections — Check the wiring plug on the sensor itself for corrosion or looseness. Reseat the connector firmly if it looks loose.
  5. Test with a multimeter (optional) — If you’re comfortable doing so, check the sensor’s resistance against the manufacturer’s spec sheet to confirm it’s working correctly.
  6. Reassemble and run a test cycle — Put the panel back, plug the machine in, and run a short cycle to see if the F04 error clears. If it reappears, the sensor likely needs replacing.

FAQ

Can I keep using my washing machine if it shows F04?
It’s best not to. The machine may not sense water levels correctly, which can lead to overfilling or an incomplete wash. Fix the issue before running further loads.

Is the pressure sensor expensive to replace?
Replacement sensors are generally affordable, often a modest parts cost, though prices vary by model. Labour costs will add to this if you use an engineer rather than doing it yourself.

Does F04 always mean the sensor is broken?
No. In many cases the issue is simply a blocked or kinked tube rather than a faulty part. Always check and clear the tube before replacing any components.