Carrier 38MGRBQ18B-3 Service Manual page 50

Multi-zone outdoor unit ductless system sizes 18r, 24hh, 30hh, 36r, 36hh, 48r and 48hh

Table of Contents

38MGRBQ: Service Manual

E3/ PC 40 (Communication malfunction between IPM board and outdoor main control board) diagnosis (Cont)

NOTE: Use a multimeter to test the DC voltage between black pin and white pin of signal wire. The normal value should be around 5V. Use a

multimeter to test the DC voltage between the black pin and red pin of signal wire. The normal value should be around 12V.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Fig. 45 — E3/ PC 40

Fig. 46 — E3/ PC 40

Table of Contents

38mgrbq24c-3 38mgrbq30d-3 38mgrbq36d-3 38mgrbq48e-3