Ntc - Bosch WAT28400 Repair Instructions

Design and function
3.18

NTC

3.18.1 Structure
Fig. 26: Components of the NTC
1 Electrical connection
2 Connecting cables
The NTC is an electrical component. The housing (4) encloses the semi-conductor
resistor (1) and the connecting cables (2). Semi-conductor resistor and housing
touch each other.
The electrical connection (1) of the NTC is designed as a plug or socket.
3.18.2 Function
NTC resistors are conductive materials with a negative temperature coefficient
(Negative Temperature Coefficient = NTC). As the temperature rises, the electrical
resistance of the NTC drops.
2017-05-22 / DIS 113_58300000186503_ara_en_c
3 Semi-conductor resistor
4 Housing
Copyright by BSH Hausgeräte GmbH
Fig. 27: The function of the NTC
The NTC converts the temperature in the detergent solution to electrical resistance.
The electronics evaluate the resistance of the NTC and actuate a switching
process if the setpoint temperature of the detergent solution is exceeded or drops
below the minimum.
3.18.3 Work area
The operating range is 0–99 °C
Measured values see circuit diagrams
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