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11
KOMFORT Ultra D105-A
Fault
Possible reason
Fault handling
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 your 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.
Remove and clean the air dampers, the supply diffusers, the
exhaust grilles to ensure free air flow.
The speed switch is defective.
Turn the unit off and contact your seller for troubleshooting.
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.
TROUBLESHOOTING AND FAULT HANDLING
Table 2. Fault list and fault handling
