Lennox VEPS075N432K, User Manual

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DC Inverter Multi VRF System
29
(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.
For example, division symbol L and content symbol 4 together means over-current protection.
Indoor
Error
Code
Content
Error
Code
Content
L0 Malfunction of IDU (uniform) L1 Protection of indoor fan
L2 Auxiliary heating protection L3 Water-full protection
L4 Over-current protection 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 1-to-more: IDU series is inconsistent LH Alarm due to bad air quality (Fresh air unit)
LC Models for IDU and ODU are not matched EC
Drop protection of discharge temperature sensor of
compressor 1
d1 Indoor PCB is poor d3 Malfunction of ambient temperature sensor
d4
Malfunction of entry-tube temperature
sensor
d5 Malfunction of middle temperature sensor
d6 Malfunction of exit-tube temperature 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 dC Abnormal setting for capacity button
dL
Malfunction of air-outlet temperature
sensor(Fresh air unit)
dE Malfunction of indoor CO
2
sensor (fresh air unit)
FP Malfunction of DC motor J7 Gas-mixing protection of 4-way valve
J8 High pressure ratio protection of system J9 Low pressure ratio protection of system
JA Protection due to abnormal pressure JL High-pressure protection
b6
Malfunction of inlet temp sensor of gas-liquid
separator
b7
Malfunction of outlet temp sensor of gas-liquid
separator
b9
Malfunction of heat exchanger temperature
sensor
bH Clock of system is abnormal
P6 Drive IPM module protection of compressor P7
Malfunction of drive temperature sensor of
compressor