Friedrich VRP12K, Service And Parts Manual

Page: 168 / 221

168 PB
TROUBLESHOOTING
Diagnostic Codes (Voltage/ Amperage)
Amperage (or Current) Diagnostic Codes
The current sensing portion of the MCS had detected that the motor is pulling more than designed amperage.
Grounded Motor
Faulty/”Demagged” Motor
Damaged MCS Board
I2T (IPM Amperage) Faults
The current sensing portion of the MCS had detected that the motor is pulling the maximum allowable amperage for an
extended period of time.
Dirty or restricted coils
Blocked or restricted Motor
Abnormally high outdoor temperature
1
2
3
1-2
1-3
2-3
Check the each terminal to the
compressor to ground.
Disconnect wires from compressor before checking. The compressor should
ohm out with the same resistance between the terminals
1.5 to 3.5 Ohms on any
two phases
5M+
Ohms
Compressor is attached to the MCS with flag terminals for easy access. If you do not get the same
resistance through each phase (+/- 0.1), then test the terminals directly.