How to test sensors , compressor , indoor and outdoor fan for air conditioner Bosch – Nobu
Indoor Units: BMS500-AAU009-0AHXXA , BMS500-AAU012-0AHXXA , BMS500-AAU009-1AHXXA , BMS500-AAU012-1AHXXA , BMS500-AAU018-1AHXXA , BMS500-AAU024-1AHXXA , NBO-09IDU , NBO-12IDU , NBO-18IDU , NBO-24IDU.
Outdoor Units: BMS500-AAS009-0CSXXA , BMS500-AAS012-0CSXXA , BMS500-AAS009-1CSXXA , BMS500-AAS012-1CSXXA , BMS500-AAS018-1CSXXA , BMS500-AAS024-1CSXXA , NBO-09ΟDU , NBO-12ΟDU , NBO-18ΟDU , NBO-24ΟDU.
How to test sensors
Temperature sensors:
- Room temp.(T1) sensor
- Indoor coil temp.(T2) sensor
- Outdoor coil temp.(T3) sensor
- Outdoor ambient temp.(T4) sensor
- Compressor discharge temp.(T5) sensor
Resistance to Temperature value table for resistive sensors: T1,T2,T3,T4
Resistance to Temperature value table for resistive sensors: T5
How to test compressor
Measure the resistance value of each winding by using the tester.
Compressor Model |
Compressor Model |
Compressor Model |
Compressor Model |
|
ASN98D22UFZ |
ASM135D23UFZ |
ATF235D22UMT |
ATF250D22UMT |
|
|
Blue – Red |
1.57Ω |
1.75 Ω |
0.75 Ω |
0.75 Ω |
|
Blue – Black |
1.57Ω |
1.75 Ω |
0.75 Ω |
0.75 Ω |
|
Red – Black |
1.57Ω |
1.75 Ω |
0.75 Ω |
0.75 Ω |
How to test indoor – outdoor fan
Indoor or Outdoor DC Fan Motor
- Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and needs to be replaced.
- Outdoor DC Fan Motor. Power on , and check if the fan can run normally, if the fan can run normally, the PCB must have problems and needs to be replaced. If the fan can’t run normally, measure the resistance of each two pins. If the resistance is not equal to each other, the fan motor must have problems and needs to be replaced, otherwise the PCB must have problems and needs to be replaced.
- Indoor AC Fan Motor. Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V (208~240V power supply) or 50V (115V power supply), the PCB must have problems and needs to be replaced.
How to test sensors , compressor , indoor and outdoor fan for air conditioner Bosch – Nobu.
