Lennox LNINVC052, Руководство по обслуживанию

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61
Installation and Maintenance
Service Manual
36
Zero-crossing
malfunction of
outdoor unit
U9
■ ■ ☆ □
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop.
Hardware
malfunction of
outdoor unit's
main board; 1. Replace
outdoor unit's
main board
AP1;
37
Limit/
decrease
frequency
due to freeze
protection
FH
■ ■ ■ □
All loads
operates
normally, while
operation
frequency of
compressor
decreases.
Poor air return
of indoor unit or
speed of fan is
too low
1. Check
whether indoor
unit's horizontal
louver can
close normally
→ replace
indoor unit's
main board →
replace indoor
unit's motor;
38
Outdoor DC
fan motor
malfunction
L3
Outdoor DC
fan motor
malfunction lead
to compressor
stop operation DC fan motor
malfunction or
system blocked
or the connector
loosed