Bosch R32 - 5.5 Troubleshooting by Error Code

CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08) 43
Troubleshooting
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
Black
Blue
Red
Fig. 66.
Position Resistance Value
KSK89D53UEZ KSM135D23UFZ KTF235D22UMT
Blue - Red 2.35W
(20°C/68°F)
1.28W
(20°C/68°F)
0.75W
(20°C/68°F)
Blue - Black
Red - Blue
Table 17.
Fig. 67.
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 Normal resistance value Digital tester Normal resistance value
(+)Red (-)Black ∞
(Several MW)
(+)Red (-)Black ∞
(Several MW)
P N U N
U V
V W
W (+)Red
Table 18.