Error Code List - Lennox LNINVE052 Service Manual

Service Manual

9.2 Error Code List

Display Method of Indoor Unit
Malfunction
No.
Name
Display
of dual-
8 nixie
tube
High
1 pressure E1
protection
Freeze
2 E2
protection
Installation and Maintenance
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation Cool Heat
Indicator Indicator Indicator
Flash
once
every 3s
Flash
twice
every 3s
Display Method of Outdoor
Unit
(Indicator has 3 kinds of
display status and they
will be displayed circularly
every 5s.)
□OFF
■Illuminated ☆ Blink
D40/ D41/ D42/ D43/
D5 D6 D16 D30
During
cooling
and drying
operation,
compressor
and outdoor
fan stop while
□ ☆ ☆ ☆
indoor fan
operates.
During
heating
operation, all
loads stop.
During
cooling
and drying
operation,
compressor
and outdoor
fan stop while
■ □ ■ □
indoor fan
operates.
During
heating
operation, all
loads stop.
A/C Status Possible Causes Countermeasures
Refrigerant is
superabundant;
Poor heat-
exchanging
(including heat
exchanger is dirty
and radiating
environment is
not good);
Ambient
temperature is
too high;
Poor connection
of LPP;
Pressure switch
is damaged;
Hardware
malfunction of
outdoor unit's
main board;
Poor air return of
indoor unit;
Rotation speed
of indoor fan is
abnormal;
Evaporator is
dirty;
1. Reduce
refrigerant volume;
2. Clean the
heat exchanger;
improve radiating
environment of
unit;
3. Reduce load
4. After de-
energization,
reinsert LPP
terminal tightly;
5. Replace
pressure switch;
6. Replace outdoor
unit's main board;
1. Check
whether indoor
unit's horizontal
louver can close
normally;
2. Replace indoor
unit's main board→
replace indoor fan
3. Clean
evaporator of
indoor unit;
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