Mitsubishi Electric PURY-P72 Service Handbook page 318

[ IX Troubleshooting ]
4. BC controller transformer
BC controller control board
CNTR CN03
Red White Red Red
Normal Abnormal
CNTR(1)-(3) about 58 ohm.
Open-phase or shorting
CN03(1)-(3) about 1.6 ohm.
* Before measuring the resistance, pull out the connector.
HWE1116D - 309 - GB