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Yes, this can happen, and if a new NTC/temperature sensor hasn’t cured it the fault is usually elsewhere in the heating control circuit.

Before checking anything internal, isolate the washing machine from the mains.

1. Check the heater isn’t partially shorting to earth A heater can sometimes overheat or behave oddly if it is breaking down, even if it still “works”. If you have a meter, the heater should be checked for insulation leakage to earth with the proper test equipment. A standard multimeter often won’t show this properly.

2. Inspect the wiring between NTC, heater and main PCB Look for damaged plugs, corrosion, loose connections or broken wires, especially around the bottom of the tub and where the loom flexes. If the control board is not getting the correct NTC signal, it may keep heating too long.

3. Consider the main control board/heater relay A sticking or welded heater relay on the PCB is a common cause of overheating. If the relay contacts are sticking closed, the heater can remain energised longer than it should. On many Bosch machines this is a realistic possibility if the sensor has already been replaced.

4. Double-check the replacement sensor is correct Pattern parts can sometimes have the wrong resistance curve. If it’s not a genuine or correct-spec Bosch NTC, the board may read temperature incorrectly.

5. Note exactly when it overheats Does it heat constantly from the start, or only go too hot during wash? That helps tell the difference between a relay stuck on and a sensing/control fault.

If you’re not equipped to test live/heating circuits or the PCB, I’d strongly recommend a qualified appliance engineer, as this involves mains-powered components. WhitegoodsHelp AI