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UAB KOMFOVENT we reserve the right to make changes without prior notice
VERSO PRO2_guide_20-07
Code
Message
Possible cause
User‘s actions
1B
Lo
w supply air flow
1. Contaminated air filters.
2. Excessive resistance of the air
duct system.
3. VAV air flow control selected
but pressure sensors are not
connected.
4. Supply air fan not working
properly.
1. Check air filters and replace, if needed.
2. Check air dampers, air inlet/exhaust openings.
3. If VAV air flow control is required, install and
connect duct-mounted pressure sensors. If VAV
mode is not necessary – select CAV or DCV in the
settings.
4. Contact authorised service.
2B
Low extract air flow
1. Contaminated air filters.
2. Excessive resistance of ducts.
3. VAV air flow control selected
but pressure sensors are not
connected.
4. Exhaust air fan not working
properly.
1. Check air filters and replace, if needed.
2. Check air dampers, air inlet/exhaust openings.
3. If VAV air flow control is required, install and
connect duct-mounted pressure sensors. If VAV
mode is not necessary – select CAV or DCV in the
settings.
4. Contact authorised service.
3B
VAV calibration fail
Not connected or faulty pressure
sensors.
Check pressure sensors and their measuring
range. If a sensor needs to be replaced, contact
an authorized service representative.
4B
Change outdoor air
filter
Contaminated outdoor air filters. Replace the air handling unit filters.
5B
Change extract air
filter
Contaminated exhaust air filters. Replace the air handling unit filters.
6B-11B
Electric heater off
Electrical heater temperature
has risen above 70 °C, because:
1. Supply air flow is too low at
high heating demand.
2. Electric heater
malfunctioning.
When the heater cools down, it will turn on again
automatically.
1 a. Check air filters and air ducts.
1 b. Decrease the desired temperature.
1 c. Increase ventilation intensity.
2. Contact authorised service.
14B
Service time
Time for annual periodic
maintenance.
Clear the message after performing periodic
maintenance.
95B
Low heat exchanger
efficiency
1. Heat exchanger efficiency
decreased due to unfavourable
temperature or humidity
conditions.
2. One or two faulty temperature
sensors inside the unit.
3. Air mixing between different
flows.
1. Message will disappear automatically when
the air temperature or humidity changes and
efficiency increases.
2. Check the readings of the temperature sensors.
If a sensor(s) needs to be replaced, contact an
authorized service representative.
3. Check the unit door for tightness and all
gaskets or sealant joints for wear.
112B
Water pump/
coil alarm
Signal from the water flow
sensor or circulation pump
received.
Check if there is enough water in the system and
whether the circulation pump and water mixing
valves are working.
113B, 114B
CF exchanger not
calibrated
CF heat exchanger calibration
not performed or not successful.
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.
127B
Service mode
Temporary special operating
mode that can only be activated
by a service specialist.
If the unit has been previously repaired, contact
the person who repaired the unit to make sure
that the service mode can be disabled. Service
mode is turned off by deleting a message.
