Carrier 40MPHA - Troubleshooting by Error Code

22
TROUBLESHOOTING BY ERROR CODE
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.
Fig. 13 – Compressor Checking
Table 17—Compressor Checking
Position Resistance Value
ATM115D43UFZ2
Blue - Red
1.87Ω(20°C/68°F)Blue - Black
Red - Blue
Fig. 14 – Compressor Checking
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.
Table 18—IPM Continuity Check
Digital Tester Normal Resistance Value Digital Tester Normal Resistance Value
(+) Red (-) Black
∞
(Several MΩ)
(+) Red (-) Black
∞
(Several MΩ)
P
N U
N
U V
V W
W (+) Red