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Alarm list
Compact
Alarm list
The following list applies to Compact ventilation units with the CTS602 control. The events are divided into the following categories:
Warning Operation continues, but an incident has occurred that should be kept in mind.
Alarm Operation is partially or completely stopped as it is a critical fault that needs immediate attention.
ID Type Display text Description / cause Troubleshooting
1 Hardware error Error in the hardware of the control sys -
tem.
Note alarm and reset it.
If the alarm does not disappear contact
service.
2 Alarm timeout A warning alarm has become a critical
alarm.
Note alarm and reset it.
If the alarm does not disappear contact
service.
3 Fire alarm
activated
The ventilation unit is stopped due to the
fire thermostat being activated.
If there is no fire, check the connection to
the fire thermostat.
If okay, contact service.
4 Pressure switch The high-pressure switch in the refrigera -
tion circuit has been triggered, possibly due
to:
• Extremely warm outdoor air supply
• Clogged filter
• Broken fan
Check for faults and reset the alarm.
Contact service if you cannot reset the
alarm or if alarms often occur.
6 Error in de-icing the
heat pump
The de-icing time has been exceeded.
The exchanger or the heat pump has failed
to de-ice within the maximum time.
This may be due to the unit being exposed
to very low outdoor temperatures.
Contact service if resetting the alarm does
not help.
Register the current operating tempera -
tures from the Show data menu in order to
ease the service process.
10 Overheating of elec -
trical
after-heating
The electrical heating element has over -
heated. Lack of airflow due to, for instance,
blocked filters, blocked air intake or defect
supply air fan.
Make sure that air is blown into the house.
Make sure the filters are clean.
Check that the outdoor air intakes is not
blocked.
Reset alarm.
Contact service if the above does not solve
the problem.
11 Low flow over the
electrical heating
element
Lack of airflow in supply air. See alarm code 10.
13 High temperature
electricity supple -
mentary heating
HW.
The temperature for the electricity supple -
ment in the hot water tank has been too
high.
The over-heating fuse located behind the
lower door is to be re-engaged. In case of
repeated alarms contact service.