What F1 Means
WHICH MACHINES THIS APPLIES TO: F1 is a single-character code, and Asko only ever used single-character codes on its older dishwasher control platforms - the DW20 boards, sold in the United States as the 3000 and 5000 Series, and the DW70 boards that followed. A current Asko dishwasher (DBI, DFI, DSD and the DW60-series machines from roughly 2015 onward) has no F1 at all. Those number their faults from F10 upward. If your display is showing two digits, this is not your page.
DW20 AND DW70 PLATFORM - WHAT F1 MEANS: the service manual calls it a temperature stop fault and defines the condition exactly: during the heating stage the water temperature rose by less than 5 degrees Celsius in ten minutes. The control decides heating is not working, leaves the heating stage and carries on with the rest of the programme. Asko notes the fault is not used on the DW20.1.
WHAT THE MACHINE DOES NEXT: nothing dramatic, which is the point worth knowing. The wash finishes, only cooler than it should have been. That is why the manual records F1 as indicated only in the service menu: the code is stored for a technician to read out, and the owner is shown nothing at all. What the owner actually sees is dishes that come out wet and greasy, or a cycle that seems to end sooner than usual.
CLASSIFICATION: fault. Not a status message and not a maintenance reminder.
A MISPRINT WORTH KNOWING ABOUT: Asko's own DW70 service manual prints fault code F2 against both the temperature stop fault and the overfilling fault for the DW70.C panel, while the DW70.5 panel shows F1 for the temperature stop. The two entries cannot both be right, and it reads as an error in the manufacturer's document rather than two different behaviours.
Common Causes of F1
- Heating element open circuit or burnt out
- Thermistor reporting the water temperature incorrectly
- Water level too low for the element to be properly covered
- Circulation pump not moving water across the element
- Control unit, connectors or wiring between the control and the element
🔧 One Safe Check You Can Try
There is no owner-facing check for F1, because on these machines the code never reaches the display - it is read out of the service menu, and entering the service menu means holding two buttons down while the main power switch is operated. That is a technician procedure and it is described that way in Asko's service documentation, not in the consumer manual. What is genuinely useful is observation. Run a normal hot programme and, when it ends, note three things: whether the inside of the door feels warm at all, whether the machine is plumbed to a cold or a hot supply, and how long the cycle actually ran against its stated time. Those three answers narrow the cause to the element, the thermistor or the water level before anything is opened. Do not try to test the element yourself. Reaching it means isolating the dishwasher at the outlet or the breaker, unfastening it from the cabinet and drawing it out with the inlet and drain lines still attached, and the element terminals sit in the base alongside mains wiring.
⚠ Why You Shouldn't Go Further Than That
- The element terminals and the mains wiring sit in the machine base and are live whenever the dishwasher is connected to power, so the appliance has to be isolated at the outlet or the breaker before anything is opened.
- A built-in dishwasher must be unfastened from the cabinet and drawn forward before the base is reachable, which puts strain on the inlet and drain connections that are still attached to it.
- The service menu that holds this code is entered through a button-and-power-switch sequence that also opens a component test, and running that test energises the valve, the pumps and the element in turn.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.