Carrier 42QHP09E8S Service Manual page 64

5.1.3 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
P
 Page 60 
Normal resistance
value
(-)Black
∞
N
U
V (Several MΩ)
W
Digital tester
(+)Red (-)Black
U
V
N
W
(+)Red
Normal resistance
value
∞
(Several MΩ)