Heating Circuit - Electrolux EWM 1000 AEG Service Manual

Heating Circuit

The cycle temperature is fixed by the μP depending on the selected program. The heating element RC is
connected by the "full" contact of the level pressure switch of fN (21/24) and of that of fTR (11/14).
The temperature control is guaranteed by the μP through the NTC temperature sensor. The temperature
sensor reduces its resistance according to the temperature increase.
The reduction in the ohmio value of the temperature sensor is detected by the μP; as soon as the
selected temperature is reached the power supply to the heating element will be paused.
The NTC sensor is integrated in the heating element.
NTC-Sensor
1. NTC resistance
2. Metallic casing
3. Connections
4. Plastic casing
To check the NTC sensor function you can measure the ohmic resistance between the contacts
J5/1 and J5/2.
Variations of NTC resistance
Temperature (°C)
0
15
30
40
50
60
70
80
90
Security
- The pressure switch fN and fTR insures the power part security of the heater function.
- The μP will be break off if an anomaly on the termistance circuit is detected :
cut or short-circuit. (see Page Service-Program fault display E70)
- The heating phase is not executed.
DGS-TDS-N 11.06 R.B.
Resistance (Ohm)
13325
7855
4028
2663
1801
1244
876
628
458
© Electrolux
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599 51 50 25 EN