GB
Alarms |
19
Malfunction
Action
The unit cannot be
controlled (control
functions are stuck)
1. Reset control functions by pulling out the plug for 10 seconds.
2. Check the modular contact connection between the HMI and the main printed circuit
board.
Low supply air
temperature
1. Check the display for alarms.
2. Check the active user functions in HMI screen if Defrosting function is running.
3. Check set supply air temperature in the HMI.
4. Check if ECO mode is activated in HMI (it is a power saving function and prevents the
heater from activating).
5. Check if user modes HOLIDAY, AWAY or CROWDED are activated in the HMI or via a
hardwired switch.
6. Check the analogue inputs in the service menu to verify that the temperature sensors
are functioning correctly.
7. In case of installed electrical/other re-heater battery: Check if the overheat protection
thermostat is still active. If necessary, reset by pressing the red button on the front plate
of the electrical re-heater.
8. Check if the extract filter must be changed.
9. Check if the unit has a re-heater battery connected. At very cold outdoor conditions an
electrical or water heating battery might be necessary. A re-heater battery can be
acquired as an accessory.
Noise/vibrations
1. Clean fan impellers.
2. Check that the screws holding the fans are tightened.
3. Check that the anti vibration lists are fitted to the mounting bracket and to the back of
the unit.
4. Check that the rotor belt is not slipping if the unit has rotating heat exchanger.
9 Alarms
Press HELP button on the active alarm to access FAQ and troubleshooting (if available). Press ACKNOWLEDGE on the in-
dividual alarm to clear it. Depending on alarm type and the cause, it might be necessary to do a troubleshooting first to
acknowledge active alarm.
It may be not possible to clear the status of alarm if the cause of alarm is still present, as that would immediately trigger
alarm to return.
9.1 Alarm list
Alarm name Explanation Do the following
Frost protection
Frost protection of return water in
heating coil.
• Alarm stops the unit and opens
the water valve completely.
The alarm will reset once the water
temperature reaches 13°C.
Check the water fluid temperature in
heating coil.
Check the circulation pump of water
heater. Contact your installation
company or place of purchase.
Frost protection temperature
sensor
Indicates malfunction of water
heater temperature sensor.
• Alarm stops the unit.
Check that frost protection
temperature sensor is connected
properly and cable is not damaged.
Contact your installation company or
place of purchase.
Defrosting error
Indicates failure of pre-heater to
preheat the incoming outdoor air (in
case Extra controller is configured as
Preheater).
• Alarm stops the unit.
Check the pre-heater reset button.
Check the pre-heater cabling.
Contact your installation company or
place of purchase.
Defrosting error may be caused by
extremely low outdoor air
temperatures or pre-heater failure.
211465 | A003
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