UAB KOMFOVENT we reserve the right to make changes without prior notice
C5.1_22- 08
19
Code Message Possible cause Elimination
5A, 6A
Outdoor air tempera-
ture sensor failure
The external air temperature sen-
sor is not connected or broken.
Check connections of the sensor or
replace the sensor.
7A, 8A
Exhaust air tempera-
ture sensor failure
The exhaust air temperature sen-
sor is not connected or blocked.
Check connections of the sensor or
replace the sensor.
9A, 10A
Water temperature
sensor failure
The water temperature sensor is
not connected or broken.
Check connections of the sensor or
replace the sensor.
11A
Return water tem-
perature low
Return water temperature of the
heater dropped below the permis-
sible limit.
Check the status and operation
of the circulation pump, heating
system and mixing valve actuator.
12A Internal re alarm
Fire danger in the ventilation
system.
Check the ventilation system. Find
the source of the heat.
13A External re alarm
A re signal has been received
from the re signalization system
of the building.
Delete alarm message and restart
the unit when the re signal disap-
pears.
14A External stop
A signal from an external device
(switch, timer, or sensor) has been
received.
As soon as the auxiliary device is
switched o, the unit will operate
in the previous mode.
15A
Heat exchanger
failure
Blocked or not rotating rotor, by-
pass damper failure.
Check the rotor drive, replace the
belt or check the by-pass channel
operation.
16A Heat exchanger icing
Icing may form under a low out-
door temperature and high room
humidity.
Check the operation of the rota-
tion heat exchanger drive or the air
bypass damper of the plate heat
exchanger.
17A
Low supply air tem-
perature
The heating equipment fails to op-
erate or its capacity is insucient.
Check the heating equipment.
18A
High supply air tem-
perature
The heating equipment is not con-
trollable (mixing valve or contactor
is blocked).
Check the heating equipment.
21A-23A
Electric heater
overheat
The emergency overheating
protection of the electrical heater
has actuated.
Protection can be reset only by
pressing the RESET press-button
on the heater.
24A, 25A
Evaporator air
temperature sensor
failure
The evaporator air temperature
sensor is not connected or broken.
Check connections of the sensor or
replace the sensor.
46A
CF exchanger not
calibrated
CF calibration failed and there is a
risk of exchanger freezing
Make sure that all doors are closed,
there is no obstructions in the
ducts and AHU can reached airow
setpoint of COMFORT 1 mode.
Repeat calibration manually (see
2.5.1.3.).
15B Evaporator icing
The evaporator is iced over due to
excessively high humidity content
in the exhaust air and low outdoor
temperatures.
Check the operation of the evapo-
rator defrost system.
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