Carrier 40MAHB Series Service Manual page 29

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Index
IPM Continuity Check
1. Turn off the outdoor unit and disconnect the power supply.
2. Discharge the electrolytic capacitors and ensure all the energy storage has been discharge.
3. Disassemble the outdoor PCB or disassemble the IPM board.
4. Measure the resistance value between P and U (V,W,N), U (V,W) and N.
DIGITAL TESTER
(+) Red (-) Black
P
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
WARNING
Electricity remains in the capacitors even when the power
supply is off.
Ensure the capacitors are fully discharged before
troubleshooting.
RESISTANCE VALUE
N

U
(Several M
V
W
DIGITAL TESTER
(+) Red
U
V


W
-
Fig. 23 — N-W
29
RESISTANCE VALUE
(-) Black

(Several M
N

