17
Leaflet Number 611272 January 2012
Installation and Maintenance
MRXBOX90L Mechanical Ventilation with Heat Recovery
8.0 Error code table
Error code
Cause
Action user
Action installer
F2
The inlet fan has stopped
• Contact the installer
• Replace the inlet fan, it is defective
F5
The outlet fan has stopped
• Contact the installer
• Replace the outlet fan, it is defective
F9
The temperature sensor that
• Contact the installer
• Check the wiring from the sensor
measures the temperature of
to the basic pcb
the input air is defective. The
• Check the sensor connection to
unit operates as expected but
the wiring
the bypass is out of operation
• Replace the sensor
F10
The temperature sensor that
• Contact the installer
• Check the wiring from the sensor
measures the temperature of
to the basic pcb
the output air is defective. The
• Check the sensor connection to
unit operates as expected but
the wiring
the bypass is out of operation
• Replace the sensor
9.0 Routine maintenance
Routine maintenance is limited to periodically cleaning or replacing the
filters. The filter only has to be cleaned when that is indicated on
the display (it shows the text
"FIL"
) or, if a multiple switch with filter
indication is mounted, when the red LED at the switch lights up.
The filters must be replaced every year. It is not permitted to use the
appliance without filters.
1. Put the 3-way switch at setting 1 to let the
appliance’s fans run at low speed.
Open the filter door.
2. Remove the filters and note how the filters are
fitted into the unit. The filters can be cleaned
with a vacuum cleaner.
3. Refit the filters back into the unit the same way
they were taken out.
4. Close the filter door.
After cleaning the filter or replacing with a new
filter, the filter indication must be reset by
pressing the key
"OK"
during 1 second
.
The display will blink for a moment to confirm
that the filter has been reset.
The unit will return to operational mode.
Put the 3-way switch back to the original
setting.
1
2
3
Figure 18.
1
2
3
- RESET -
- ON -
-
SET
-
-
OFF -
Note: If setting 2 does not work with a mechanical rpm control device, such as a multiple switch, the RJ connector has been
connected the wrong way round. Cut off one of the RJ connectors to the rpm control and mount a new connector the other way round.
