North American M2OC-18HRDN1-M, Service Manual

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original factory settings. The temperature indicator area will display
“SC” when the self
clean function is started.
It also displays the malfunction code or protection code.
FAN SPEED indication lamp
Displays the selected fan speed: AUTO (nothing) and three fan speed levels: LOW, MED
and HIGH.
LED display control function.
Pressing
“LED display” button on remote controller will turn off all displays on indoor unit,
while pressing once again, all displays will resume.
7.3 Outdoor unit
’s digital display tube
There is a digital display tube in outdoor PCB.
7.3.1 Digital display tube display function

In standby , The LED displays
“
－－
”
,

In compressor operation, the LED display the frequency,

In defrosting mode, The LED displays the frequency or
“dF” each other for 2
seconds,

In compressor pre-heating,
The LED displays “
－－
”

In protection or malfunction, the LED displays error code or protection code.
7.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display
tube will display the follow procedure when push SW1 each time:
Display Remark
1 Indoor unit capacity demand code
2 Outdoor unit running mode code Off:0, Cooling:1, Heating:2
3 Amendatory capacity demand code
4 Outdoor unit fan motor state Off:0, Low speed:1, High speed:2
5 Evaporator outlet temp. for 1# indoor unit Actual data
6 Evaporator outlet temp. for 2# indoor unit Actual data
7 Evaporator outlet temp. for 3# indoor unit Actual data
8 Evaporator outlet temp. for 4# indoor unit Actual data
9 Condenser pipe temp. Actual data
10 Ambient temp. Actual data
11 Compressor discharge temp. Actual data
12 Inverter current Actual data
13 EXV open angle for 1# indoor unit Actual data×8
14 EXV open angle for 2# indoor unit Actual data×8
15 EXV open angle for 3# indoor unit Actual data×8
16 EXV open angle for 4# indoor unit Actual data×8
17 Outdoor unit DC Voltage AD *472/255=Actual Voltage
18 Indoor unit number The indoor unit can communicate with
outdoor unit well.
19 The last error or protection code 00 means no malfunction