Carrier 38MGRBQ18B-3 - Page 36

38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
36
DIAGNOSIS AND SOLUTION (CONT)
PIC3: Main board LED when power on and
unit standby.
Power
Standby
Operating
PIC2: IPM (for 4 zone and 5 zone)
PIC 4: Check point button, press 1 time for check
how many indoor units are connected.