nilan CTS 602 User Manual page 11

Alarm codes are given because of a fault situation or when it is important to inform the user.
The alarms are divided into the following categories:
C Critical Operation is partly or completely stopped as long as the alarm is active.
W Warning These types of alarms will become critical if the problem is not solved
quickly.
I Informative Normal operation is not affected. Alarm disappears when it is reset.
Alarm Categori
code
00 --
01 C
02 C
03 C
04 C
05 C
06 C
07 C
08 C
10 C
May be subject to change
Text in
display
-- No alarms
HARDWARE Error in control hardware
TIMEOUT Warning alarm W has become
a critical alarm.
FIRE Critical alarm.
The system has stopped be-
cause the fire thermostat has
been activated.
PRESSURE High or low pressure switch in
the cooling circuit has been
triggered, probably caused by:
High pressure:
Extreme hot
Cloaked filter
Defective fan
Low pressure:
Extreme cold
Unit might have lost coolant
Cloaked filter
Defective fan
DOOR The inspection door is open
DEFROST The unit is defrosting.
The frost protection of the heat
recovery system is insufficient
and the unit will stop. This can
be caused by extreme low
outdoor temperatures
FROST 1) Frost-protection of heating
surface: the inlet air over
the heating surface is too
cold which can be caused
because the by-pass
damper is open.
2) The water from the central
heating is too cold.
FROST One of the temperature sen-
sors in the unit is short circuit
or defect.
OVERHEAT Electrical heating surface has
been overheated due to lack of
airflow.
Description/ cause How to remedy alarms
Contact service if reset
does not help
Note and reset the alarm.
Contact service if alarm
does not disappear.
If there has not been a fire
please contact service.
Check for errors and reset
alarms.
If you are unable to reset
the alarm or if the alarm
occurs often please contact
service.
Close the door
Contact service if reset
does not help. Note the
actual sensor temperatures
from the menu "Show data"
to help service.
1) Close by-pass damper,
activate heating surface
and reset alarm.
2) Check that the heating
supply for the heating
surface is OK. Reset
alarm when fault has
been repaired.
Note the sensor and contact
service.
Check filters, air intake and
ventilators. Reset alarm.
Contact service centre if
system fails to operate sat-
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