Lennox LNINVC052 - Page 57

54
Installation and Maintenance
Service Manual
9
Blockage
protection of
indoor unit
H6
Flash
11 times
every 3s
Indoor fan,
outdoor fan,
compressor
and electric
heating
tube all stop
operation;
horizontal
louver stops
at current
position.
Feedback
terminal of PG
motor hasn't been
inserted tightly.
Refer to
maintenance
owchart
Control terminal
of PG motor
is not inserted
tightly.
Fan is blocked
Malfunction of
motor.
Circuit
malfunction of
main board.
10
Malfunction
protection of
jumper cap
C5
Flash
15 times
every 3s
Operation
of remote
controller or
control panel
is available,
but the unit
won’t act.
Jumper cap
hasn't been
inserted on main
board.
Refer to
maintenance
owchart
Jumper cap
hasn't been
inserted correctly
and tightly.
Jumper cap is
damaged.
Circuit of
main board is
abnormal.
11
Indoor
fan circuit
malfunction
by zero
cross
detection
U8
Flash
17 times
every 3s
Operation
of remote
controller or
control panel
is available,
but the unit
won’t act.
1. Discharging
speed of
capacitor is slow,
which lead to
wrong judgement
of controller.
Refer to
maintenance
owchart
Zero-crossing
detection circuit
of main board is
abnormal