Troubleshooting By Error Code; Common Check Procedures - Bosch CLIMATE 5000 Service Manual

5.5

Troubleshooting by Error Code

5.5.1

Common Check Procedures

Temperature Sensor Check
Disconnect the temperature sensor from PCB, measure the resistance
value with a tester.
Temperature Sensors.
Room temp.(T1) sensor.
Indoor coil temp.(T2) sensor.
Outdoor coil temp.(T3) sensor.
Outdoor ambient temp.(T4) sensor.
Compressor discharge temp.(Tp) sensor.
Measure the resistance value of each winding by using the multi-meter.
Compressor checking
Measure the resistance value of each winding by using the tester.
Input Terminal
Blue
Red
Black
Fig. 66.
IPM Continuity Check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the
resistance between P and UVWN; UVW and N.
Digital tester
(+)Red (-)Black
P N
U
V
W
Table 18.
CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08)
Blue
Black
Red
Normal resistance value
∞
(Several MW)
Position Resistance Value
KSK89D53UEZ
Blue - Red 2.35W
(20°C/68°F)
Blue - Black
Red - Blue
Table 17.
Fig. 67.
Digital tester
(+)Red (-)Black
U N
V
W
(+)Red
Troubleshooting
KSM135D23UFZ KTF235D22UMT
1.28W 0.75W
(20°C/68°F) (20°C/68°F)
Normal resistance value
∞
(Several MW)
43