Lennox LNINVE052 - Page 55

52
Installation and Maintenance
Service Manual
3
High discharge
temperature
protection of
compressor
E4
Flash
4 times
every 3s
■ □ ■ ☆
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
See 9.3
(diagnosis of
overheating
prevention
and overload
protection)
Refer to
maintenance
owchart
4
Overcurrent
protection E5
Flash
5 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;
Power voltage
is too low;
overload.
2. Reduce
load;
Malfunction of
hardware.
3. Replace
outdoor unit's
main board
AP1
5
Communication
malfunction E6
Flash
6 times
every 3s
□ □ □ ☆
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
See 9.3
(diagnosis of
communication
malfunction)
Refer to
maintenance
owchart
6
Overload
protection
E8
Flash
8 times
every 3s
■ □ ■ ■
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
See
9.3(diagnosis
of overheating
prevention
and overload
protection)
Refer to
maintenance
owchart