Lennox MWCB Series Service Manual

6
2.3. Engineering Mode for System Query
• To enter engineer mode, in power-on or standby mode
and in non-locked state, using the wireless remote
control, press the key combination ON/OFF button and
FAN button for 7 seconds.
• After entering the engineer mode, the wireless remote
control will display the following icons (Auto, Cool, Dry,
Heat and the Battery) at the same time. In addition, will
also display the numeric code of the current engineer
mode (engineer mode startup mode will display
numeric code 0).
• In engineer mode, the value of the current numeric
code can be adjusted using the Up/Down button. The
ranges of codes are O to 30.
• To exit engineer mode, using the wireless remote
control, press the key combination ON/OFF button and
FAN button for 2 seconds.
• Engineering mode will automatically end if there is no
valid key operation for 60 seconds.
ON/OFF BUTTON
FAN BUTTON
UP / DOWN BUTTON
2.3.1. Engineering Mode Codes
Table 2. Engineering Mode Codes
Display
Code
Query Content Description
0
Default start code that will be displayed when going into
engineering mode.
1
Room temperature T1 temperature
2
Indoor coil temperature T2 temperature
3
Outdoor coil temperature T3 temperature
4
Ambient temperature T4 temperature
5
Discharge temperature TP temperature
6
Compressor Target Frequency FT Targeted Frequency
7
Compressor Running Frequency Fr Actual Frequency
8
Unit Current dl N/A
9
Outdoor AC Voltage Uo N/A
10
Current indoor capacity test state Sn N/A
11
Reserve
12
Set Speed Pr of the outdoor fan Outdoor fan
speed=value*8
13
Opening Lr of EEV EXV opening angle-
value*8
14
Actual Running Speed ir of the
indoor fan
Indoor fan
speed=value*8
15
Indoor Humidity Hu N/A
16
Set Temperature TT after
compensation
N/A
17 - 19
Reserve
20
Indoor Target Frequency oT N/A
21 - 30
Reserve
2.3.2. Engineering Mode Error Codes
Table 3. Engineering Mode Error Codes
Coded Description Code
Indoor unit EEPROM error
EH 00/EH 0A
Communication error between indoor unit and outdoor
units
EL 01
Indoor fan speed error (DC motor)
EH 03
Indoor room temperature sensor error (T1)
EH 60
Indoor coil temperature sensor error (T2)
EH 61
Refrigerant leakage detection (Cooling mode only)
EL 0C
Communication error between main control board and
display board
EH 0b
Outdoor current overload protection
PC 08
Outdoor ambient temperature sensor error (T4)
EC 53
Outdoor coil temperature sensor error (T3)
EC 52
Compressor discharge temperature sensor error (TP) or
sometimes referred to as (T5)
EC 54
Outdoor unit EEPROM error
EC 51
Outdoor unit fan speed error (DC fan motor)
EC 07
Inverter module IPM error
PC 00
High or Low voltage protection
PC 01
Outdoor low ambient temperature protection
PC 0L
Compressor drive error
PC 04
Outdoor ambient temperature too low
PC 0L

Lennox MWCB Series Specifications

General

Brand	Lennox
Model	MWCB Series
Category	Air Conditioner
Language	English