Lennox LNINVE052 Service Manual page 56

Service Manual
Indoor
ambient
temperature
7 F1
sensor is
open/short-
circuited
Indoor
evaporator
temperature
8 F2
sensor is
open/short-
circuited
Installation and Maintenance
Flash
once
every 3s
Flash
twice
every 3s
Connection
terminal between
indoor ambient
temperature
The unit will
sensor and main
stop operation
board is loose or
as it reaches
poor connection.
the temperature
There's short
point. During
circuit due to trip-
cooling
over of the parts
and drying
on main board;
operation,
compressor
Indoor ambient
and outdoor
temperature
unit stop,
sensor is
while indoor
damaged (Please
fan operates;
check it by
During heating
referring to the
operation,
resistance table
the complete
for temperature
unit stops
sensor)
operation.
Main board is
damaged.
Connection
terminal between
indoor evaporator
temperature
The unit will
sensor and main
stop operation
board is loose or
as it reaches
poor connection.
the temperature
point. During
There's short
cooling
circuit due to trip-
and drying
over of the parts
operation,
on main board;
compressor
and outdoor
Indoor evaporator
unit stop,
temperature
while indoor
sensor is
fan operates;
damaged (Please
During heating
check it by
operation,
referring to the
the complete
resistance table
unit stops
for temperature
operation.
sensor)
Main board is
damaged.
Refer to
maintenance
flowchart
Refer to
maintenance
flowchart
53