Lennox VEP060N432U - Error Indication

DC Inverter Multi VRF System
34
Problems
Causes
What to do
Too many heat resources in the room.
Reduce heat resources.
Filter is blocked and dirty.
Clean the filter.
NOTE:
If problem cannot be solved after checking the above items, please contact
LENNOX service center
and describe the cases and models.
(2) Following circumstances are not malfunctions.
Malfunction
Reason
Unit doesn’t run.
Unit starts up immediately after it is turned
off.
Overload protection switch makes it run after a
3-min delay.
Power is just turned on. Standby operation lasts for about 1min.
Mist comes from
the unit.
Under cooling. Indoor air with high humidity is cooled rapidly.
Noise is emitted.
Slight cracking sound is heard when unit is
just turned on.
It is the noise when electronic expansion valve is
initialized.
There is consecutive sound when cooling.
It is the sound for gas refrigerant flowing in the
unit.
There is sound when unit starts or stops.
It is the sound when gas refrigerant stops flowing.
There is slight and consecutive sound
when unit is running or after running.
This is the sound of drainage operation.
Cracking sound is heard when unit is
running or after running.
This is the sound caused by the expansion of
panel and other parts of the unit due to
temperature change.
Unit blows out
dust.
Unit starts up after not operating for a long
time.
Dust in indoor unit is blown out.
Unit emits odor.
Under operation.
Unit absorbs the room odor and then blows it out.
7 Error Indication
Inquiry method of error indication: combine division symbol and content symbol to check the
corresponding error.
Indoor:
Error Code
Content
Error Code
Content
L0
Malfunction of IDU (uniform)
d1
Indoor PCB is poor
L1 Protection of indoor fan d3
Malfunction of ambient temperature
sensor
L2 Auxiliary heating protection d4
Malfunction of entry-tube temperature
sensor
L3
Water-full protection
d5
Malfunction of middle temperature sensor
L4 Abnormal power supply for wired controller d6
Malfunction of exit-tube temperature
sensor
L5
Freeze prevention protection
d7
Malfunction of humidity sensor
L6
Mode shock
d9
Malfunction of jumper cap
L7
No main IDU
dA
Web address of IDU is abnormal
L8
Power supply is insufficient
dH
PCB of wired controller is abnormal
L9 1-to-more: number of IDU is inconsistent dC
Setting capacity of DIP switch code is
abnormal
LA t1-to-more: IDU series is inconsistent dL
Malfunction of air outlet temperature
sensor
LH
Alarm due to bad air quality (Fresh air unit)
dE
Malfunction of indoor CO
2
sensor
LC
IDU is not matching with outdoor unit
db
Debugging status