Nespresso Citiz & Co EF 488 - Manual (Page 139)

Citiz service manual 139
F U N C T I O N T E S T S
9.7 NTC temperature sensor functionality
The resistance of the NTC temperature sensor must be within a defined range, other­
wise the temperature regulation will not work properly and the coffee machine will stay/
go into failure mode.
An easy way to check the functionality of the NTC temperature sensor is to measure the
ohmic resistance at ambient temperature. With this measurement, most defect NTC
temperature sensors can be detected.
Avoid contamination
of sensor contact sur­
face during handling.
1) Unplug NTC temperature sensor from
electronic control board.
2) Remove NTC temperature sensor
from thermoblock (refer to page 104
and following).
3) Measure temperature of sensor body
(do not touch either temperature or
NTC sensor by hand).
4) Measure resistance of NTC tempera­
ture sensor by connecting a multime­
ter at the plug.
5) Compare measuring values with fol­
lowing diagram or table.