Midea M2OC-18HFN1-M Service Manual page 38

35 AD value of current
36 AD value of voltage
37 EXV open angle for A indoor unit
38 EXV open angle for B indoor unit
39 EXV open angle for C indoor unit
40 EXV open angle for D indoor unit
41 EXV open angle for E indoor unit
42 Frequency limit symbol
43 Average value of T2
44 Outdoor unit fan motor state
45 The last error or protection code
9.3.2 Outdoor unit's digital display tube
There is a digital display tube in outdoor PCB.
Digital display tube display function
 In standby , the LED displays "- -"
 In compressor operation, the LED display the running frequency,
 In defrosting mode, The LED displays "dF" or alternative displays between running frequency and
"dF"(each displays 0.5s)
 In compressor pre-heating, The LED displays "PH" or alternative displays between running frequency
and "PH"(each displays 0.5s)
 During the oil return process, The LED displays "RO" or alternative displays between running
frequency and "RO"(each displays 0.5s)
 In low ambient cooling mode, the LED displays "LC" or alternative displays between running
frequency and "LC"(each displays 0.5s)
 In forced cooling mode, the LED displays "FC" or alternative displays between running frequency and
"FC"(each displays 0.5s)
 When PFC module protection occurs three times within 15 minutes, the LED displays "E6" or
alternative displays between running frequency and "E6"(each displays 0.5s)
 In protection or malfunction, the LED displays error code or protection code.
The display value is hex number.
For example ,the digital display tube show "Cd", it means AD value is 205.
Actual data/4.
If the value is higher than 99, the digital display tube will show single digit and
tens digit.
For example ,the digital display tube show "2.0",it means the EXV open angle
is 120×4=480p.)
Frequency limit caused by IGBT
Bit7
radiator
Bit6
Frequency limit caused by PFC
Bit5
Frequency limit caused by T4.
Bit4
Frequency limit caused by T2.
Bit3
Frequency limit caused by T3.
Bit2
Frequency limit caused by Tp.
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
The display value is
hex number. For
example, the digital
display tube show
2A,then Bit5=1,
Bit3=1, Bit1=1.
It means frequency
limit caused by
T4,T3 and current.