Common Malfunction And Troubleshooting - Lennox VEP Series Installation & Operation Instructions

Lennox VRF Unit
6 Common Malfunctions and Troubleshooting
Check the following items before contacting for repair.
Phenomenon
The unit doesn't
run.
Insufficient energy of remote controller
Remote controller is out of control scope
Unit runs but stop Air intake or outlet of indoor or outdoor unit is
immediately
Air intake or outlet of indoor or outdoor unit is
Abnormal cooling
or heating
Too many heat resources in the room
(1)When installing remote monitor or central controller, displacement on indoor units' project codes
must be made. Otherwise, there will be collision malfunction of the project codes. For detail
operation methods, please refer to the VRF Installation and Maintenance Manual.
(2) If problem can not be solved after checking the above items, please contact Lennox VRF with model and
serial numbers of equipment and detailed description of malfunction.
Reason
Without power supply
Voltage is too low
Broken fuse or breaker trips off
blocked
blocked
Improper temperature setting
Fan speed is set too low
Wind direction is not correct
Door or windows are opened
Direct sunshine
Too many people in the room
Filter is blocked for dirt
Connect to power supply
Check if the voltage is within rating range
Replace fuse or connect breaker
Control scope is within 8m
Adjust setting at wireless remote
controller or wired controller
Adjust setting at wireless remote
controller or wired controller
Adjust setting at wireless remote
controller or wired controller
Close the door or windows
Draw curtain or louver
Reduce heat resources
61
Measure
Replace new battery
Remove obstruction
Remove obstruction
Clean the filter