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UAB KOMFOVENT we reserve the right to make changes without prior notice
VERSO PRO2_guide_20-07
EN
Code
Message
Possible cause
User‘s actions
41A,42A
Supply air temp.
sensor failure
Not connected or faulty
temperature sensor inside
the unit, measuring supply air
temperature downstream the
heat exchanger.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
43A,44A
External stop
The unit stopped by an external
device connected to the
additional zone module.
Once the additional device is stopped, the unit
will run in a normal mode.
45A
Water pump/
coil alarm
Signal from the wat
er flow
sensor or circulatory pump
received.
Check if there is enough water in the system and
whether the circulation pump and water mixing
valves are working.
46A
CF exchanger not
calibrated
CF heat exchanger calibration
failed, therefore, the heat
exchanger is at risk of freezing.
Check the unit door for tightness, check for
obstacles in the duct system and check whether
the air handling unit can reach the air volume
specified in COMFORT 1 mode. Repeat calibration
manually.
90A
Service mode
C5 controller blocked.
Contact authorised service.
91A-98A
Controller failure
Faulty controller electronic or no
connection between controller
electronics.
1. Check if all wires and cables are connected
between the unit sections.
2. Contact authorised service.
99A-103A
Supply fan failure
Supply air fan or frequency
converter not working.
1. Check if all wires and cables are connected
between the unit sections.
2. Check the fan circuit breakers.
3. Contact authorised service.
104A-108A
Exhaust fan failure
Exhaust air fan or frequency
converter not working.
1. Check if all wires and cables are connected
between the unit sections.
2. Check the fan circuit breakers.
3. Contact authorised service.
109A-113A
Rotor drive failure
Rotary heat exchanger motor
or frequency converter not
working.
1. Check if all wires and cables are connected
between the unit sections.
2. Contact authorised service.
114A-124A
Communication error
Faulty controller electronic or no
connection between controller
electronics.
1. Check if all wires and cables are connected
between the unit sections.
2. Contact authorised service.
125A,127A
Controller failure
Faulty C5 controller.
Contact authorised service.
126A
Controller failure
1. Improperly connected or
defective external devices.
2. Faulty C5 controller.
1. Check connection of external devices or
contact the representative of the installer.
2. Contact authorised service.
