Error Indication - Lennox VEP034N432US User Manual

Problems
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.
Unit starts up immediately after it is turned
off.
Unit doesn't run.
Power is just turned on.
Mist comes from
Under cooling.
the unit.
Slight cracking sound is heard when unit is
just turned on.
There is consecutive sound when cooling.
There is sound when unit starts or stops.
Noise is emitted.
There is slight and consecutive sound
when unit is running or after running.
Cracking sound is heard when unit is
running or after running.
Unit blows out Unit starts up after not operating for a long
dust. time.
Unit emits odor. Under operation.

7 Error Indication

Inquiry method of error indication: combine division symbol and content symbol to check the
corresponding error.
Indoor:
Error Code
L0 Malfunction of IDU (uniform)
L1 Protection of indoor fan
L2 Auxiliary heating protection
L3 Water-full protection
L4 Abnormal power supply for wired controller
L5 Freeze prevention protection
L6 Mode shock
L7 No main IDU
L8 Power supply is insufficient
L9 1-to-more: number of IDU is inconsistent
LA t1-to-more: IDU series is inconsistent
LH Alarm due to bad air quality (Fresh air unit)
LC IDU is not matching with outdoor unit
Causes
Too many heat resources in the room.
Filter is blocked and dirty.
Malfunction
Content
Reduce heat resources.
Clean the filter.
Overload protection switch makes it run after a
3-min delay.
Standby operation lasts for about 1min.
Indoor air with high humidity is cooled rapidly.
It is the noise when electronic expansion valve is
initialized.
It is the sound for gas refrigerant flowing in the
unit.
It is the sound when gas refrigerant stops flowing.
This is the sound of drainage operation.
This is the sound caused by the expansion of
panel and other parts of the unit due to
temperature change.
Dust in indoor unit is blown out.
Unit absorbs the room odor and then blows it out.
Error Code
d1 Indoor PCB is poor
Malfunction of ambient temperature
d3
sensor
Malfunction of entry-tube temperature
d4
sensor
d5 Malfunction of middle temperature sensor
Malfunction of exit-tube temperature
d6
sensor
d7 Malfunction of humidity sensor
d9 Malfunction of jumper cap
dA Web address of IDU is abnormal
dH PCB of wired controller is abnormal
Setting capacity of DIP switch code is
dC
abnormal
Malfunction of air outlet temperature
dL
sensor
dE Malfunction of indoor CO
db Debugging status
34
DC Inverter Multi VRF System
What to do
Reason
Content
sensor
2