Midea MCH2U-18PHH2 Service Manual page 40

43 Average value of T2
44 Outdoor unit fan motor state
45 The last error or protection code
46 F indoor unit capacity
47 F indoor unit capacity demand code
48 F indoor unit evaporator outlet temperature
(T F)
2B
49 F indoor unit room temperature (T
50 F indoor unit evaporator temperature (T
51 EXV open angle for F indoor unit
8.3.2 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.
Bit2
Frequency limit caused by T5.
Bit1
Frequency limit caused by current
Bit0
Frequency limit caused by voltage
(Sum T2 value of all indoor units)/(number of indoor units in good
connection)
Off: 0, High speed:1, Med speed: 2, Low speed: 3, Breeze:4,
Super breeze: 5
00 means no malfunction and protection
F)
1
F)
2
40
Bit5=1, Bit3=1,
and Bit1=1.
This means
that a
frequency limit
may be caused
by T4, T3, or
the current.