Nibe AG-WT10 series, Technical Manual

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Document Number: 38-9007-142 Revision: 02
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9 Troubleshooting
Error Meaning System behaviour Solution
E1 Error on the outdoor unit Fan is stopped and flap is
closed.
The system restarts
automatically as soon as the
problem on the outdoor unit
is solved. Check the error code using the appropriate
LEDs on the PCB of the outdoor unit. Follow
the indications of the diagnosis for the
outdoor unit.
Check that connections between C1 and C2
on outdoor and indoor terminal block is
consistent (C1 terminals connected
together, C2 terminals connected
together).
Check that a shielded communication cable
for serial connection has been used.
Verify that the dip-switch SW1 for
communication address setting is in the
correct position.
Check that earth cables are properly
connected to every terminal.
Check that the shield of the communication
cable is properly connected to every
terminal.
Chech that all internal earth cable are
properly connected.
Check the communication fuse on outdoor
unit.
Check the communication fuse on indoor
unit.
Check that the outdoor unit has power
supply and that the unit is working.
Check that all the pcbs are powered on.
Be sure that power supply has not been
connected to the communication terminals.
Check that there are no burnt signes on the
pcbs, in particular close to communication
cables.
E3 Communication error
between the outdoor unit
and the indoor unit. Fan is stopped and flap is
closed after 30 seconds of
missing communication.
The system restarts
automatically as soon as the
communication is recovered.
Check that the fan motor is not damaged
and doesn’t create short circuit on the
indoor pcb.
E4 ICT (Indoor Coil
Temperature) sensor fault. Fan is stopped and flap is
closed.
The system restarts as soon
as the sensor is repaired.
Reconnect or replace the sensor.