Disconnect compressor leads from IPM. Measure resistance between terminals (U-V, V-W, W-U). For most Carriers, each pair should read 0.5–3 ohms and all three nearly equal. Next, meg each terminal to copper tubing – must be >20 MΩ. Less than 500 kΩ indicates a ground fault.
Repeated P5-2 failures can damage the compressor due to poor oil return. carrier p5-2 fail
The P5-2 error code is Carrier’s proprietary diagnostic message for an combined with a communication error between the indoor and outdoor units . Disconnect compressor leads from IPM
: You can attempt to clear the code by turning the power off for 1–2 minutes or using the Reset button on the control panel. W-U). For most Carriers