UAB KOMFOVENT we reserve the right to make changes without prior notice
C5.1-20-05
17
Code
Message
Possible cause
Elimination
1A, 2A
Supply air temperature
sensor failure
The supply air temperature sensor is
not connected or broken.
Check connections of the sensor or
replace the sensor.
3A, 4A
Extract air temperature
sensor failure
The discharged air temperature sensor
is not connected or broken.
Check connections of the sensor or
replace the sensor.
5A, 6A
Outdoor air temperature
sensor failure
The external air temperature sensor is
not connected or broken.
Check connections of the sensor or
replace the sensor.
7A, 8A
Exhaust air temperature
sensor failure
The exhaust air temperature sensor is
not connected or blocked.
Check connections of the sensor or
replace the sensor.
9A, 10A
Water temperature sen-
sor failure
The water temperature sensor is not
connected or broken.
Check connections of the sensor or
replace the sensor.
11A
Return water tempera-
ture low
Return water temperature of the heater
dropped below the permissible limit.
Check the status and operation of the
circulation pump, heating system and
mixing valve actuator.
12A
Internal fire alarm
Fire danger in the ventilation system.
Check the ventilation system. Find the
source of the heat.
13A
External fire alarm
A fire signal has been received from
the fire signalization system of the
building.
Delete alarm message and restart the
unit when the fire signal disappears.
14A
External stop
A signal from an external device
(switch, timer, or sensor) has been
received.
As soon as the auxiliary device is
switched off, 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 outdoor
temperature and high room humidity.
Check the operation of the rotation
heat exchanger drive or the air bypass
damper of the plate heat exchanger.
17A
Low supply air tem-
perature
The heating equipment fails to operate
or its capacity is insufficient.
Check the heating equipment.
18A
High supply air tem-
perature
The heating equipment is not control-
lable (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 press-
ing the RESET press-button on the
heater.
24A, 25A
Evaporator air tempera-
ture 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 airflow 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 evaporator
defrost system.
12B
High pressure on
compressor
Compressor system operated in an
overload mode as a result of too high
temperature in the condensing unit.
Indentify the cause and eliminate it.
13B
Low pressure on com-
pressor
Compressor system is leaky or the
amount of refrigerant is insufficient.
Indentify the cause and eliminate it.
