38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Table 26 — Outdoor PCB (18K Only)
Press # DISPLAY REMARK
0 Normal Display Displays running frequency, running state, or malfunction code
1
Quantity of indoor units with working connection
Actual Data
Display Indoor Unit #
11
22
33
44
55
2 Outdoor unit running mode code Off: 0,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost: A
3 Indoor unit A capacity
The capacity unit is horse power. If the indoor unit is not connected, the digital display shows the following:
“¯¯”
(9K:1HP,12K:1.2HP,18K:1.5HP,24K:2.0HP)
4 Indoor unit B capacity
5 Indoor unit C capacity
6 Indoor unit D capacity
7 Indoor unit E capacity
8 Indoor unit A capacity demand code
Norm code*HP
(9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.0HP)
9 Indoor unit B capacity demand code
10 Indoor unit C capacity demand code
11 Indoor unit D capacity demand code
12 Indoor unit E capacity demand code
13 Outdoor unit amendatory capacity demand code
14
The frequency corresponding to the total indoor
units' amendatory capacity demand
15 The frequency after the frequency limit
16
The frequency sending to compressor control chip
17
Indoor unit A evaporator outlet temperature (T2BA)
If the temperature is lower than 15.8F (-9C), the digital display shows 15.8F (-9C) If the temperature is
higher than 158F (70C), the digital display shows 158F (70C). If the indoor unit is not connected, the
digital display shows: “-----”
18
Indoor unit B evaporator outlet temperature (T2BB)
19
Indoor unit C evaporator outlet temperature (T2BC)
20
Indoor unit D evaporator outlet temperature (T2BD)
21
Indoor unit E evaporator outlet temperature (T2BE)
22 Indoor unit A room temperature (T1A)
If the temperature is lower than 32F(0C), the digital display shows ?32F(0C). If the temperature is higher
than 122F(50C) the digital display shows 122F(50C). If the indoor unit is not connected, the digital display
shows: “-----”
23 Indoor unit B room temperature (T1B)
24 Indoor unit C room temperature (T1C)
25 Indoor unit D room temperature (T1D)
26 Indoor unit E room temperature (T1E)
27 Indoor unit A evaporator temperature (T2A)
If the temperature is lower than 15.8F (-9C), the digital display shows ?15.8F (-9C). If the temperature is
higher than 158F (70C), the digital display shows 158F (70C) If the indoor unit is not connected, the digital
display shows:“-----”
28 Indoor unit B evaporator temperature (T2B)
29 Indoor unit C evaporator temperature (T2C)
30 Indoor unit D evaporator temperature (T2D)
31 Indoor unit E evaporator temperature (T2E)
32 Condenser pipe temperature (T3)
33 Outdoor ambient temperature (T4)
34 Compressor discharge temperature (TP)
The display value is between 86F-264F(30-129C). If the temperature is lower than 86F(30C), the digital
display shows 86F(30C). If the temperature is higher than 210F(99C), the digital display shows single and
double digits. For example, if the digital display shows “0.5”, the compressor discharge temperature is
221F(105C).
35 AD value of current
The display value is a hex number.
For example, the digital display tube shows “Cd”, it means AD value is 205.
36 AD value of AC voltage
37 AD value of DC voltage
38 EXV open angle for A indoor unit
Actual data/4.
If the value is higher than 99, the digital display shows single and double digits.
For example, if the digital display shows “2.0", the EXV open angle is 120×4=480p.
39 EXV open angle for B indoor unit
40 EXV open angle for C indoor unit
41 EXV open angle for D indoor unit
42 EXV open angle for E indoor unit
43 MVI valve open angle
44 EVI valve open angle
45 Frequency limit symbol
Bit7 Reserve
The display value is a hexadecimal
number. For example, the digital display
show 2A, then Bit5=1, Bit3=1, and
Bit1=1.
This means that a frequency limit may be
caused by current, IPM or T3.
Bit6 Frequency limit caused by voltage
Bit5 Frequency limit caused by current
Bit4 Reserve
Bit3 Frequency limit caused by IPM
Bit2 Frequency limit caused by T5
Bit1 Frequency limit caused by T3
Bit0 Frequency limit caused by T2
46 T2B fault
00:No fault,01:T2B-A fault, ,02:T2B-B fault ,03:T2B-C fault,04:T2B-D fault, 05:T2B-E fault, 06:T2B-F fault
(The display priority is A-B-C-D-E-F)
47 Average value of T2
(Sum T2 value of all indoor units)/(number of indoor units in good connection) (The heating is the average
value of T2, and the cooling is the average value of T2B)
48 Outdoor unit fan motor state
Off: 0, Super ultra high speed:1, Super high speed:2, High speed:3, Med speed: 4, Low speed: 5, Breeze:6,
Super breeze: 7
49 Reason of stop
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