nilan CTS602 - Alarm List

Alarm list
Alarm codes are given as a result of a fault or when important information should be provided to the
user.
Alarms fall into the following categories:
C Critical: Running or partially stopped as long as the alarm is active.
W Warning: Becomes critical if the situation is not improved within a reasonable period.
I Informative: Normal operation not affected. The alarm will disappear when the user cancels it.
Alarm code Category Display text Description/cause Fault correction
0 -- -- No alarm
1 C HARDWARE Fault in control system hardware
Contact service if cancellation
does not help
2 C TIMEOUT
Warning alarm (W) has become a
critical alarm
Note alarm and reset.
Contact service if alarm does not
disappear
3 C FIRE
Fire thermostat. Units stopped
because fire thermostat is active
If there has been no fire, contact
service
7 C FROST
1. Frost protection of heater:
Intake air passing over heater
is too cold. Can be due to
bypass damper being open.
2. District/central heating water
too cold (e.g. oil-fired boiler
stopped)
1. Close bypass damper, activate
heater, reset alarm.
2. Check heating supply to
comfort heater is OK.
Reset alarm when fault
corrected.
8
C T
x
SHORT
One of the temperature sensors
has short-circuited or is faulty
Note which sensor, T
x
, has short-
circuited, e.g. T1 short and contact
service
9 C T
x
OPEN
One of the temperature sensors
has been disrupted or is faulty
Note which sensor, T
x
, has been
disrupted, e.g. T1 disrupt and
contact service
10 C OVERHEAT
Electrical heater overheated.
Insufficient air flow due to e.g.
blocked filters, blocked air intake
or faulty intake fan
Check air is being blown into the
home.
Check filter and air intake.
Reset alarm.
Contact service if the above does
not help
11 C AIRFLOW
Insufficient airflow at intake.
See alarm code 10.
See alarm code 10.
15 W ROOM LOW
When the room temperature is
under 10°C the unit will stop to
avoid further cooling. This can be
for a period when the house is
unoccupied and the heating is
switched off.
Heat up the house and reset alarm
16 I SOFTWARE Fault in control system program Contact service
17 I WATCHDOG Fault in control system program Contact service
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