EN
UAB KOMFOVENT we reserve the right to make changes without prior notice
16
C3.1-16-01
2.8 Table. Failures indicated on the control panel, possible reasons and it elimination
Message
Possible Failure Cause
Failure Elimination
Change supply air filter
Supply air filter is clogged.
After unit is off, it is necessary to change filter.
Change exhaust air filter
Exhaust air filter is clogged.
After unit is off, it is necessary to change filter.
Low supply air
temperature
Supply air temperature dropped lower allow-
able level.
Check program settings, unit heat
exchanger and heater operation.
Supply air
overheating
Supply air temperature is higher allowable
level.
Check program settings, unit heat
exchanger and heater operation.
Supply air fan overheat-
ing
Supply air fan motor
overheated due to excessive load.
Check if air filters are inserted, if the unit doors
are closed, if unit ventilation system has been
installed correctly.
Exhaust air fan
overheating
Exhaust air fan overheated due to excessive
load.
Check if air filters are inserted, if the unit doors
are closed, if unit ventilation system has been
installed correctly.
Heater off
Heater is disconnected due to low air flow.
When heater cools down, protection restores
automatically. It is recommended to increase
ventilation intensity level.
Electric heater
overheating
Electric heater overheating
protection is on.
To restore protection, it is possible only after
pressing “RESET” button, which is located on
the heater.
Return water low
temperature
Return water temperature in water heater
dropped lower allowable level.
Check circulation pump and heating system con-
dition, heating valve actuator performance.
Frost
possibility
Temperature of the air passing through plate
heat exchanger, dropped lower allowable level.
Check by-pass damper condition and actuator
performance. It is recommended to decrease
ventilation level.
Rotor
stopping
The belt is broken, or failure of the rotor motor. Check rotor drive and rotation
sensor condition.
Fire
alarm
Received fire alarm signal from the building
fire system.
When fire alarm signal disappears, unit needs
to be restarted from control panel.
B1 sensor
failure
Supply air temperature sensor is not con-
nected or broken down.
It is necessary to check sensor
connections or change the sensor.
B2 sensor
failure
Exhaust air temperature sensor is not con-
nected or broken down.
It is necessary to check sensor
connections or change the sensor.
B3 sensor
failure
Outdoor temperature sensor is not connected
or broken down.
It is necessary to check sensor
connections or change the sensor.
B4 sensor
failure
Plate heat exchanger temperature sensor is not
connected or broken down.
It is necessary to check sensor
connections or change the sensor.
VAV calibration fail
Pressure sensors are not connected or broken. Check connections of the sensor or replace
the sensor.
Summary of Contents for C3.1
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