38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
47
E2/ EL 01 (Communication malfunction between indoor and outdoor units) diagnosis and solution (Cont)
Fig. 40 — PIC 1
PIC 1: Use a multimeter to test the DC voltage between the outdoor unit’s 2 (old: L2) port and 3 port. The multimeter’s red pin
connects with 2 (old: L2) port while the black pin is for 3 port.
When the unit is normal running, the voltage moves alternately between positive and negative values.
Fig. 41 — PIC: 2 IPM board (for 2 zone/ 3-zone)
Operating
Standby
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