Lennox LNWR53X - Troubleshooting Common Issues; Unit Not Operating; Low Efficiency Problems; Air Flow and Noise Issues

Service Manual
Technical Information
14
5.2 PCB Printed Diagram
5.2.1 Silk screen on main board
● TOP VIEW
● BOTTOM VIEW
Main board
1234
5
6 7 8 9 10 11 12 13
14
15
1 Input of live wire 2 fuse 3 12V power input 4 buzzer 5
Interface of
display board
6
Tube
temperature
sensor
7
Ambient
t e m p e r a t u r e
sensor
8
Outdoor tube
temperature
sensor
9 swing 10 4-way valve
11 Fan (high speed) 12
Fan (medium
speed)
13 Fan (low speed) 14
Neutral
wire
15
Power input of
power board