38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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OUTDOOR UNIT DIGITAL DISPLAY
A digital display is featured on the outdoor PCB. The LED displays different codes in the following situations:
• Standby: “- -.”
• Compressor operation: the running frequency.
• Defrosting mode: “dF” or alternative displays between running frequency and “dF” (ach appears for 0.5s.)
• Compressor pre-heating: “PH” or alternative displays between running frequency and “PH” (each appears for 0.5s.)
• Oil return process: “RO” or alternative displays between running frequency and “RO” (each appears for 0.5s.)
• Low ambient cooling mode: “LC” or alternative displays between running frequency and “LC” (each appears for 0.5s.)
• Forced cooling mode: the LED displays “FC” or alternative displays between running frequency and “FC” (each appears for 0.5s).
• PFC module protection occurs three times within 15 minutes: “E6” or alternates between displays of running frequency and “E6” (each appears for
0.5s.)
In protection or malfunction, the LED displays an error code or protection code.
OUTDOOR UNIT DISPLAY
Outdoor Unit Point Function
A check switch is included on the outdoor PCB.
Push SW1 to check the unit’s status while running. The digital display displays codes (see Table 25 on page 29) each time the SW1 is pushed.
Fig. 36 — Outdoor PCB (18K shown)
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