Lennox LNINVC063 User Manual

60
Installation and Maintenance
Service Manual
32
Drop
malfunction
of DC busbar
voltage
U3
Flash
20 times
every 3s
□ ■ ■ ■
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
Power voltage
is unstable, big
uctuation.
1. Check
whether power
supply network is
abnormal;
33
Low voltage
protection of
DC bus bar
PL
Flash
21 times
every 3s
□ ■ ■ □
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
The voltage at
positions L and N
on wiring board
(XT) is lower than
150 VAC
1. Check
whether power
supply network is
abnormal;
Hardware
malfunction of
outdoor unit's
main board;
2. Replace
outdoor unit's
main board AP1;
34
Limit/
decrease
frequency due
to module
temperature
protection
EU
■ ■ ■ ☆
All loads
operates
normally, while
operation
frequency of
compressor
decreases.
Radiating grease
on IPM module
of outdoor unit's
main board is not
enough; screws
haven't been
xed tightly;
1. After the
system is de-
energized for
20min and
discharge,
check whether
radiating grease
on IPM Module
of outdoor
control board
AP1 is enough
and whether the
radiating is xed
tightly;
Hardware
malfunction of
outdoor unit's
main board;
2. Replace
outdoor unit's
main board AP1;
35
4-way valve is
abnormal
U7
■ □ ☆ □
This malfunction
occurs under
heating
operation: all
loads stop.
Power voltage
is lower than
AC175V
Wiring terminal
4V is loose or
broken
2. After de-
energization,
insert OVC-
COMP tightly or
replace wiring
Hardware
malfunction of
outdoor unit's
main board;
3. Replace
outdoor unit's
main board AP1;

Lennox LNINVC063 Specifications

General

Brand	Lennox
Model	LNINVC063
Category	Air Handlers
Language	English