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VERSO PRO2_guide_20-07
Code
Message
Possible cause
User‘s actions
18A
High supply air
temperature
1. Integrated
heaters malfunctioning.
2. Additional heating/cooling
devices
malfunctioning 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.
19A
Lo
w supply air flow
1. Obstacle in the duct system.
2. VAV air flow control selected
but pressure sensors are not
connected.
3. Faulty supply air fan.
1. Check that the air dampers, air intake and
exhaust openings are not blocked, check whether
the adjustment valves are not completely closed.
2. 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.
3. Contact authorised service.
20A
Low extract air flow
1. Obstacle in the duct system.
2. VAV air flow control selected
but pressure sensors are not
connected.
3. Faulty exhaust air fan
1. Check that the air dampers, air intake and
exhaust openings are not blocked, check whether
the adjustment valves are not completely closed.
2. 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.
3. Contact authorised service.
21A-23A
Electric heater
overheat
Electrical heater temperature
has risen above 100 °C, because:
1. Supply air flow too low at high
heating demand.
2. Power failure during
operation of the electric heater;
the heater could not cool down.
3. Electric heater
malfunctioning.
1 a. Check the air duct system, air intake and
exhaust dampers, fan operation.
1 b. Decrease the desired temperature.
1 c. Increase ventilation intensity.
2. Check whether the unit is connected to the
mains.
3. Contact authorised service.
Once the fault is eliminated, reset an overheating
protection fuse before restarting the unit. Look
for a yellow sticker with the word “Reset” inside
the unit that marks an overheating protection
fuse.
31A-38A
Temperature sensor
failure
One of the additional zone
temperature sensors is faulty or
not connected.
1. Check if the sensor is connected. If a sensor
needs to be replaced, contact an authorized
service representative.
2. Check whether the auxiliary temperature zone
parameters are configured correctly (see Chapter
“Functions” or “Additional zone control C5” of the
Instruction Manual).
39A,40A
Return water temp.
low
Return water temperature of the
additional temperature zone
water heater dropped below the
permissible limit.
1. Check the condition of a circulation pump
and the heating system as well as operation of a
heating damper actuator. Check if hot water is in
the system.
2. Check that the auxiliary temperature zone
parameters are configured correctly (see Chapter
“Functions” or “Additional zone control C5” of the
Instruction Manual)
