Common Malfunctions And Troubleshooting - Lennox VEP034N432US User Manual

DC Inverter Multi VRF System
No Debug item
10
11
12
IDU
13
parameters
14
Communication
15
parameters
16 Drainage system
17 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 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.
Parameter name
Fan motor's operating
freq
IDU ambient temp
Indoor heat
exchanger's inlet temp
Indoor heat
exchanger's inlet temp
Opening angle of
indoor EXV
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.
Unit
Hz Changes in 0~49Hz according to system's pressure.
°C ——
According to ambient temp, for a same IDU in cool
°C
mode, the inlet temp will be 1°C~7°C lower than the
outlet temp, and 4~9°C higher than the low pressure
value.
°C
For a same IDU in heat mode, the inlet temp will be
10°C~20°C lower than the outlet temp.
In cool mode, the opening angle of indoor EXV varies
within 70~480PLS.
PLS
In heat mode, the opening angle of indoor EXV varies
within 70~480PLS.
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.
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.
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Reference
What to do