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16
SUPPORT
If something is wrong with your ventilation unit:
• Read the chapter “ADJUSTMENTS” on page 10.
• If the unit is giving an alarm, look for a solution in
the table “TROUBLESHOOTING” on page 16.
TROUBLESHOOTING
WARNING
WARNING:
If in doubt about any of the
procedures please contact your local service
representative.
Alarm Description
Alarm
limit
Symptoms Possible reason Action Notes
FILS Service
reminder.
4 or 6
months Time for regular
maintenance.
Change filters. Press any
button for 5
seconds to
acknowledge.
Err Sensor
malfunction.
A sensor is short- or open
circuited.
Check the connections
and wiring of sensors.
- - - - Downloading.
eWind panel is
downloading data from ESC
main board.
Normal at start-up.
Otherwise check the
eWind connection cable.
oFFE Stop mode. Ventilation off.
Ventilation unit is
commanded to stop mode
by an external control
system.
AL1 Water heater
coil in danger
of freezing.
+8 °C Supply air cold. Water coil has frozen / is
about to freeze:
• Circulation pump has
stopped.
• Heat exchanger is not
rotating.
• Actuator of the water coil’s
control valve is faulty.
• Extract fan has stopped.
Restart the pump.
Replace the motor or the
belt.
Replace the actuator.
Find out why / replace
the fan.
The unit will
not start before
the alarm
condition has
been removed
and the alarm
acknowledged
by pressing
any button on
the operating
panel.
AL2 Supply air
after HRW is
cold.
+5 °C Supply air cold. Heat exchanger is not
rotating:
• Drive belt is broken.
• Drive belt is slipping.
• Heat exchanger motor has
broken down.
Replace the drive belt.
Clean or change the belt
and the heat exchanger.
Replace the heat
exchanger motor.
The ventilation
unit enters the
malfunction
status, which
means that the
extract air fan
is at minimum
speed and the
supply air fan
has stopped.
The alarm is
automatically
acknowledged
after the fault
condition is
removed.
AL3 Supply air
cold.
+10 °C Supply air cold.
Extract fan has stopped.
Replace the fan.
Extract filter is blocked.
Replace filter.
Ventilation is adjusted
incorrectly / not adjusted
at all.
Readjust/adjust
ventilation according
to the ventilation
system design, using
appropriate measuring
tools.
Heat insulation for the
ducts is inadequate.
Check the thickness of
the insulation in supply
and extract air ducts and
add insulation, if needed.
Ventilation unit fan speed is
incorrect.
Always use the fan
speed specified by
the ventilation system
designer (even in winter).