Common Malfunctions And Troubleshooting - Lennox VEPS075N432K User Manual

No. Debug item
Communication
12
parameters
13 Drainage system
14 Others

6 Common Malfunctions and Troubleshooting

WARNING:
① If there is abnormal condition (e.g. unpleasant smell), turn unit off and disconnect power
immediately. Then contact LENNOX authorized service center. If unit continues operation despite
the abnormal condition, it may get damaged and lead to electric shock or fire hazard.
② Do not repair the air conditioner by yourself. Improper maintenance may lead to electric shock
or fire hazard. Please contact LENNOX authorized service center for maintenance.
(1) Please check the items below before calling for maintenance.
Problems
Unit doesn't work.
Unit runs but stops
immediately.
Abnormal cooling or
heating.
NOTE:
If problem cannot be solved after checking the above items, please contact LENNOX service center and
describe the cases and models.
Parameter name
Communication
data
—
—
Causes
Fuse or circuit breaker is cut off.
Power failure.
Power is not connected.
Remote controller's power is not enough.
Remote controller is out of the control range.
Air inlet or air outlet of indoor and outdoor units is
blocked.
Air inlet or air outlet of indoor and outdoor units is
blocked.
Improper temp setting.
Fan speed is set too low.
Wind direction is not correct.
Door or window is open.
Direct sunshine.
Too many people in the room.
Too many heat resources in the room.
Filter is blocked and dirty.
Unit
Number of IDUs detected by software is the same
—
with the actual number. No communication error.
Indoor unit can drain water out completely and
smoothly. Condensate pipe has no backward slope of
— water; Water of outdoor unit can be drained
completely through drainage pipe. No water drop
from unit base.
Compressor and indoor/outdoor fan motor do not
—
have strange noise. Unit can operate normally.
28
DC Inverter Multi VRF System
Reference
What to do
Replace fuse or reset the circuit
breaker.
Restart unit when power is
restored.
Connect the power.
Replace new battery.
Control range is within 8m.
Clear obstructions.
Clear obstructions.
Adjust setting at remote controller
or wired controller.
Adjust setting at remote controller
or wired controller.
Adjust setting at remote controller
or wired controller.
Close the door or window.
Draw curtain or louver.
—
Reduce heat resources.
Clean the filter.