Kuppersbusch IGV 6506.1 - Checking the Heater Pump

GV 640 Service Manual 55
For internal use only
6.7.7 Checking the heater pump
Measuring the heater resistance
The heater resistance is measured on the heater contacts of the heater pump.
Readings for an intact heater:
Measuring NTC resistance
The NTC resistance is measured on the heater contacts of the heater pump.
Readings for intact NTCs and 25 °C.
Contact 2 - 3
about 10.5
Ω
Contact 3 - 4
about 10.5
Ω
Contact 2 - 4
approx. 21 ± 2
Ω
Contact 5 - 6
approx. 10 k
Ω ± 500 Ω
Contact 6 - 7
approx. 10 k
Ω ± 500 Ω
Contact 5 - 7
approx. 20
Ω
Measured at 25 °C
Resistance measurement of the NTCs
The NTC measurement must result in a symmetrical reading.