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17
KOMFORT LE
TROUBLESHOOTING AND FAULT HANDLING
In case of tripping of any of the two overheat protection thermal switches, filter clogging indicated by tripping of the differential pressure switch, in case of the
communication circuit damage the unit changes into the emergency shutdown mode with Heater blowing mode activation and turns off in 2 minutes.
The red LED light indicator turn on and the control panel displays the alarm message and its troubleshooting, see table 7.
ALARM
INDICATION
Tripping of any of the two overheat protection
thermal switches.
The unit changes into the emergency
shutdown mode with heater cooling
and turns off in 2 minutes.
The red LED light indicator turn on and
the control panel displays the alarm
message and its troubleshooting.
FAULT!!!
Heater overheating
Unit OFF
FAULT!!!
Filter clogging
Unit OFF
FAULT!!!
No communication
Unit OFF
Filter clogging (differential pressure switch
tripping).
FAULT!!!
Heater overheating
Unit OFF
FAULT!!!
Filter clogging
Unit OFF
FAULT!!!
No communication
Unit OFF
Communication circuit damage.
FAULT!!!
Heater overheating
Unit OFF
FAULT!!!
Filter clogging
Unit OFF
FAULT!!!
No communication
Unit OFF
Table 7. Unit alarm indication
Fault
Possible reason
Troubleshooting
The fan does not start
when the unit is on.
No power supply or wrong connection to power mains.
Connect the unit to power mains. Troubleshoot the connection
error.
Jammed motor, soiled impeller blades.
Remove the motor jam, clean the impeller blades.
Automatic switch
tripping
Short circuit in power grid.
Turn the unit off and contact the unit seller for troubleshooting.
Low air flow
Too low set speed.
Set higher speed.
The filters and the fans are soiled, the heat exchanger is soiled.
Clean or replace the filters, fans and heat exchanger.
The air dampers, the supply diffusers or the exhaust grilles are
closed or soiled.
Open and clean the air dampers, the supply diffusers, the
exhaust grilles to ensure free air flow.
Low supply air
temperature
The extract filter is soiled.
Clean or replace the extract filter.
The heat exchanger is iced.
Check the heat exchanger condition. Shutdown the unit if
required and turn it on after the freezing danger is no longer
imminent.
Noise, vibration
The impeller is soiled.
Clean the impeller.
The screw connection is loose.
Tighten the screws.
No flexible anti-vibration connectors.
Install the flexible anti-vibration connectors.
Condensate leakage
The drain system is clogged, damaged or wrong installed.
Clean the condensate drain system. Check the drain hose slope.
Make sure the U-trap is filled with water and the drain system is
frost-protected.
Table 8. Alarm list and troubleshooting
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