Heater With Boil-Dry Protection - Bosch WAT28400 Repair Instructions

Design and function
3.12

Heater with boil-dry protection

3.12.1 Structure
Fig. 17: Components of the heater
1 Electrical connection
2 Flange
3 Holder opening for NTC
The heating element (5) consists of a resistance heater, consisting of a heating
wire and insulation, and a fuse (4). If appliances have a stainless steel tub, the
heating element contains one fuse; if appliances have a plastic tub the heating
element contains 2 fuses.
The electrical connections (1) for the power supply and the protective conductor
connection are on the heater flange (2). In the flange of some appliances there is a
holder opening (3) for the NTC.
3.12.2 Function
The resistance heater generates heat and heats the water. The insulation
separates the electric circuit of the resistance heater from the water.
The fuse interrupts the circuit if the heating element overheats, e.g. if there is no
water in the tub during heating (boil-dry protection).
The plugs integrate the heater in the electric circuit.
2017-05-22 / DIS 113_58300000186503_ara_en_c
4 Fuse
5 Heating element
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