Bosch Dishwasher Error Code F1

F1 on a Bosch dishwasher indicates a temperature stop fault. The control unit detected that the water temperature rose less than 5°C over a ten-minute period during the heating stage. The machine exits the heating phase and continues running, but the water has not reached the proper temperature for effective washing. Components involved include the heating element, NTC thermistor, circulation pump, water level, and wiring.

The dishwasher will complete its cycle after logging F1 by skipping the heating stage, so it will not shut down abruptly or cause an immediate safety hazard. However, running repeated cycles without proper water heating means dishes are not being sanitised effectively and detergent may not dissolve or activate correctly. It is advisable to diagnose and resolve the fault before relying on the appliance for regular use.

A reset may clear the F1 code temporarily, but the error will return if the underlying fault is not repaired. Because F1 is triggered by a measurable condition during the heating stage, the code will reappear as soon as the dishwasher runs a cycle and the temperature rise threshold is not met again. A reset is useful for confirming whether the fault is intermittent, but it is not a fix on its own.

Some causes of F1 are accessible to a confident DIYer. You can check the water fill level, inspect wiring connections for corrosion or looseness, and test the heating element for continuity with a multimeter. Thermistor and circulation pump testing requires a bit more technical knowledge. Control board replacement is generally best left to a qualified technician.

Repair costs vary depending on which component has failed. A replacement heating element typically runs in the range of $40 to $120 for the part alone. An NTC thermistor is usually less expensive, often $15 to $50. Circulation pump replacement can range from $80 to $200 or more for parts. Adding professional labour costs will increase the total, with most technician service calls ranging from $100 to $300 depending on your location and the extent of the repair.