Bosch Climate 5000 Series Service Manual page 51

Outdoor Unit Digital Display
A digital display is featured on the outdoor PCB.
The LED displays different codes in the following situations:
Standby: "- -."
f
Compressor operation: the running frequency.
f
Defrosting mode: "dF" or alternative displays between running frequency
f
and "dF" (ach appears for 0.5s.)
Forced cooling mode: the LED displays "FC" or alternative displays
f
between running frequency and "FC" (each appears for 0.5s).
Compressor pre-heating: "PH" or alternative displays between running
f
frequency and "PH" (each appears for 0.5s.)
Oil return process: "RO" or alternative displays between running frequency
f
and "RO" (each appears for 0.5s.)
Low ambient cooling mode: "LC" or alternative displays between running
f
frequency and "LC" (each appears for 0.5s.)
PFC module protection occurs three times within 15 minutes: "E6" or
f
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
f
code. "PH", "RO", "LC", "E6" are not suitable for M2OA-18HFN1-M, M2OI-
18HFN1-M, M3OJ-27HFN1-M, M3OI-28HFN1-M, M4OG-36HFN1-M
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
Service Manual
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