W5
Smart
20
All rights to changes reserved.
2020-11-19
5. Alarms and Troubleshooting
5.1 Alarm, cooker hood
If the ventilation unit controlled by a cooker hood mal-
functions, all signal lamps on the cooker hood’s front
glass light three times at one minute intervals. Contact
an authorised service company.
5.2 Alarm, control panel
Any disruptions to the function of the ventilation unit are
indicated by symbols on the upper row of the base dis-
play. If there is an active alarm in the system, the screen
leaves its standby mode and does not enter standby
mode again as long as the alarm is active. The symbol for
an active alarm is . The condition that has caused the
alarm is shown by the “Alarm” item on the main menu.
A so-called info-alarm remains on the screen when the
active fault condition ceases. The Info alarm can be
reset from “Alarm” on the main menu.
5.3 Troubleshooting
A ventilation system is a unified whole composed
of several system components all of which influence
how the system operates. A malfunction in ventilation
performance could be caused by any component of the
ventilation system or by the way the system has been
installed. If during the ventilation unit’s warranty period
(2 years) after a check (see the enclosed check list) there
are functional disruptions in the ventilation unit, you can
register these using the response form at the address
www.casahelp.fi. There are also instructions, service
Status Alarms
Cause
Action
T1...T8 sensor fault
Sensor is defective or the cable
is loose/not connected.
Contact a service company. The ventilation unit runs
in a restricted operating mode.
Post heater error
Supply air too hot, control/air
heater fault or overtemperature
protection has tripped.
Contact a service company! Check the function of
the air heater for reheating and preheating.
Preheater error
The temperature of the post
heating coil is too high. Control/
air heater fault or overtempera-
ture protection has tripped.
Contact a service company! Check the function of
the air heater for preheating.
Freeze risk water-
heated air heater
Outdoor temperature below
0 °C and the temperature of
the water has dropped below
the alarm limit.
Ensure that the circulation pump in the waterborne
heating system is running and that the water supply
to the ventilation unit’s air heater is hot enough.
Faulty supply air fan No speed signal from the fan.
Contact a service company.
Faulty extract air fan No speed signal from the fan.
Contact a service company.
Contact fault
Control panel does not commu-
nicate with ventilation unit.
Restart the ventilation unit. Contact the service
company if the error persists.
External emergency
stop/fire alarm
External emergency stop
enabled. The ventilation unit is
stopped by the emergency stop
function even though the sup-
ply air is very cold.
The alarm clears automatically when the external
emergency stop or the fire alarm ceases. No info
alarm remains afterwards.
Service reminder
The set service interval has
elapsed.
Service the ventilation unit and acknowledge the
service reminder.
Important
Frost protection function
Ice can form in the heat exchanger during
periods of cold weather if the extract air
is humid. A protective function then auto-
matically reduces the speed of the supply
air fan. Under such conditions, variations in
the fan speed are therefore normal.
Under such conditions, small amounts of
ice can form inside the ventilation unit.
!
!
videos and frequently asked questions on the same
website. You directly access a web page with model
specific instructions by reading the QR code on the door
of the ventilation unit with a smartphone.
If a problem or a fault occurs on the ventilation system
after the warranty period (2 years), contact our network
of authorised service companies on www.swegonhome-
solutions.se, your real estate company’s service division
or another service company that is fully conversant with
ventilation repairs.
