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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
1A, 2A
Supply air temp.
sensor failure
Not connected or faulty supply
air temperature sensor.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
3A, 4A
Extract air temp.
sensor failure
Not connected or faulty exhaust
air temperature sensor.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
5A, 6A
Outdoor air temp.
sensor failure
Not connected or faulty outdoor
air temperature sensor.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
7A, 8A
Exhaust air temp.
sensor failure
Not connected or faulty exhaust
air temperature sensor.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
9A, 10A
Water temp. sensor
failure
Not connected or faulty return
water temperature sensor.
Check whether the sensor is connected. If
a sensor needs to be replaced, contact an
authorized service representative.
11A
Return water temp.
low
Return water temperature of the
water heater dropped below the
permissible limit.
Check the condition of a circulation pump and
the heating system as well as operation of a
mixing valve actuator. Check if hot water is
available in the system.
12A
Internal fire alarm
1. Internal temperature is above
50 °C
2. Faulty temperature sensor.
1. Locate the heat source in the ductwork or unit.
2. Contact authorised service.
13A
External fire alarm
A fire alarm received from the
building’s fire protection system.
Once fire alarm is resolved, the unit must be
started using a control panel, computer or a
smartphone.
14A
External stop
The unit stopped by an external
device (button, timer, sensor).
Once the additional device is stopped, the unit
will operate in normal mode.
15A
Heat exchanger failure
1. Rotary heat exchanger not
rotating.
2. Air bypass damper of the
counter
-flow heat exchanger
malfunctioning.
3. Liquid coupled heat
exchanger for different flows is
malfunctioning.
1. Check for foreign objects or debris preventing
rotation of the rotor drum. Check if the rotor belt
is not torn.
2. Contact authorised service.
3. Contact authorised service.
16A
Heat exchanger icing
Freezing is possible at low
outdoor temperatures and high
indoor humidity.
Check the rotary heat exchanger actuator or
counter-flow heat exchanger bypass damper for
proper operation. Check if an external pre-heater
is working, if used.
17A
Low supply air
temperature
1. Integrated heaters not
working.
2. Additional heating/cooling
devices faulty or installed
incorrectly.
3. Faulty air temperature sensor.
1. Contact authorised service.
2. Contact the company that installed or sold
additional heating/cooling equipment.
3. Contact authorised service.
