Main Board; Typical Wiring Diagram - Lennox VOSB Series Installation Instructions Manual

Error code Error Content
E0 Mode conflict
E1
Communication error between indoor and main outdoor unit
E2
T0 (Inlet air temperature sensor) malfunction
E3
T2 (Middle of evaporator sensor) malfunction
E4 T2B (Outlet of evaporator sensor) malfunction
E5 T2A (Inlet of evaporator sensor) malfunction
E6 DC fan motor error
E7 EEPROM failure
EC
TA (Outlet air temperature sensor) malfunction
To wired
controller
comm. bus
To wired
controller
power
To outdoor/
indoor/MS
units
comm. bus
CO2
sensor
Display Board
T2B
XS4
T1/T0 XS3
T2
XS2
T2A
XS1
TA
NOTE:
Component in dash line is optional or field wiring
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
Error code Error Content
MS self-inspection error
U4
F8 MS error
EEV malfunction
Eb
Ed Outdoor unit fault
High water alarm
EE
No address
FE
Emergency stop
A0
D8 Remote off
XT2
WHITE
BLUE
RED
BLACK
YELLOW
GRAY
Vco2
COM
CN12 CN11
CN14
XP5
XS5
RED
XP4
WHITE
GND
XP3
Vco2
B A L C K
XP2
L B E U
XP1
L B ACK
CN30
EEV
CN2{L_IN}
EARTH
CN4{N_IN}
N=4
L1 L2
XT1
POWER IN
Figure 18. VOSB036H4­3, VOSB048H4­3, & VOSB054H4­3

Typical Wiring Diagram

Code
FM Indoor fan motor
T0
Inlet air temperature sensor
T2A
Inlet of evaporator sensor
T2B Outlet of evaporator sensor
T2
Middle of evaporator sensor
TA
Outlet air temperature sensor
XP1-5 Connectors
ON/OFF
SWITCH
CN50
DC motor
CS
drive board
FAN CTON HTON 4 5 6
HHE interface
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
" +5V GND +12V "
ONLY USED
FOR TESTING
CN5 CN52
CN54

Main Board

CN3 CN18 CN20
ALARM PUMP
17
Title Code
XS1-5 Connectors
XT1-2
Terminals
PUMP Pump motor
CS
Water level switch
Warning lamp
ALARM
Electronic expansion valve
EEV
SVD Solenoid valve
NOTE:
1. Refer to manual for
communication wiring
2. Please use the 2-conductor
shielded twisted cable for
communication
CN13
FAN
FM
N=3
CN24
SVD
Title