Error code F04 or light flashing 4 times
Indesit error F04 means “pressure switch jammed on empty” – the PCB is not receiving confirmation that the water level has risen inside the machine. The most common cause is a blockage in the pressure system hose or chamber. A faulty pressure switch, a connection fault, or a PCB fault are also possible. Check the pressure hose for blockage as the first step.
What Error F04 Means
F04 is described as “pressure switch jammed on empty – check pressure switch and module.” On machines with a rotary dial and no digital display, this error is indicated by the dial clicking continuously round accompanied by 4 repeating flashes of the door lock LED. On models with a display, F04 is shown directly.
The pressure switch monitors water level by detecting changes in air pressure in a sealed chamber connected to the outer drum. When no water is present, the switch signals “empty” to the PCB. As water enters and rises, air pressure builds in the chamber and eventually trips the switch to signal “full.” Error F04 means the PCB received the command to fill the machine but never received confirmation from the pressure switch that the water level rose – the switch is stuck reporting “empty.”
F04 is distinct from the H20 error code, which indicates the machine is not filling at all. F04 implies the machine is allowing water in but the pressure switch is not detecting the rising level. If the machine is clearly not filling – no water sound, no water visible – H20 is the more likely code. If the machine can be heard filling but F04 appears, the pressure system is the likely cause.
Possible Causes
| Possible cause | How to identify | Action |
|---|---|---|
| Blocked pressure hose or chamber | Most common cause – detergent residue or debris can block the small hose or chamber that communicates air pressure to the switch | Inspect and clear the pressure hose. See our guide on pressure system faults |
| Kinked or disconnected pressure hose | A hose that has kinked or come off its connection at either end will not transmit pressure to the switch | Trace the hose from the drum connection to the pressure switch and check both ends are secure and the hose is undamaged |
| Failed pressure switch | If the hose and chamber are clear, the switch itself may have failed and is no longer responding to pressure changes | Test the switch with a continuity meter – a working switch changes state when air pressure is applied. Engineer recommended if uncertain |
| Wiring or connection fault | A loose or corroded connector between the pressure switch and PCB will prevent the signal reaching the PCB even if the switch is working | Check all connectors on the pressure switch wiring harness and at the PCB end |
| PCB fault | The PCB may have a fault affecting the pressure switch input. Only suspect after all other causes are eliminated | Engineer required |
Need a Repair or Part?
Related Guides
Pressure System FaultsHow the pressure switch and chamber work, and how to diagnose and clear blockages.
Error F10 / 10 Flashing LightsA related pressure switch communication fault on Indesit and Hotpoint washing machines.
Programme Dial Clicking Round ContinuouslyHow to read error codes indicated by a continuously rotating dial and flashing LED on Indesit machines.
Washing Machine Not Filling With WaterWhen the machine genuinely is not filling rather than a pressure switch fault – inlet valve and water supply checks.
Frequently Asked Questions
What does error F04 mean on an Indesit washing machine?
F04 means “pressure switch jammed on empty.” The PCB commanded the machine to fill with water but never received confirmation from the pressure switch that the water level rose. The switch remains stuck reporting empty. The most common cause is a blockage in the pressure hose or chamber. A failed switch, a wiring fault, or a PCB fault are also possible.
What is the difference between F04 and H20?
H20 indicates the machine is not filling at all – no water is entering. F04 indicates the machine has water entering but the pressure switch is not detecting the rising level. If the machine can be heard filling but the error persists, F04 and a pressure system fault is the more likely cause. If no water sound is heard at all, H20 and an inlet valve or water supply problem is more likely.
Can I fix error F04 myself?
Checking and clearing the pressure hose for blockage or kinking is accessible for a careful DIY repair. Checking and reseating wiring connectors is also accessible. Testing the pressure switch itself requires a multimeter and some knowledge of how to apply and release air pressure to the switch terminals to test continuity. PCB faults are not DIY accessible and require an engineer.
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