Dyson Error Code F4

Fault Code F4: F4 is the code for a shorted temperature sensor.

Dyson Error Code F4

Fault: F4 is the code for a shorted temperature sensor.

Applies to: Dyson AM09 Space Heater Units

Your Dyson Space Heater is designed to perform well for many years to come. Like all machines, it works best with regular maintenance. If the appliance registers a fault, this is clearly displayed with the message shown on the display panel.
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