Lennox VEPS075N432K, User Manual

Page: 34 / 40

DC Inverter Multi VRF System
28
No. Debug item Parameter name Unit Reference
1 2
Communication
parameters
Communication
data
—
Number of IDUs detected by software is the same
with the actual number. No communication error.
13 Drainage system — —
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.
1 4 Others — —
Compressor and indoor/outdoor fan motor do not
have strange noise. Unit can operate normally.
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 Causes What to do
Unit doesn’t work.
Fuse or circuit breaker is cut off.
Replace fuse or reset the circuit
breaker.
Power failure.
Restart unit when power is
restored.
Power is not connected. Connect the power.
Remote controller’s power is not enough. Replace new battery.
Remote controller is out of the control range. Control range is within 8m.
Unit runs but stops
immediately. Air inlet or air outlet of indoor and outdoor units is
blocked.
Clear obstructions.
Abnormal cooling or
heating.
Air inlet or air outlet of indoor and outdoor units is
blocked.
Clear obstructions.
Improper temp setting.
Adjust setting at remote controller
or wired controller.
Fan speed is set too low.
Adjust setting at remote controller
or wired controller.
Wind direction is not correct.
Adjust setting at remote controller
or wired controller.
Door or window is open. Close the door or window.
Direct sunshine. Draw curtain or louver.
Too many people in the room.
—
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.