Troubleshooting - Technibel iSeries Technical Data & Service Manual

12 Troubleshooting

Rank Meaning
1 PFC (Power Factor
Controller)
protection:
automatic
protection against
power supply
disturbances and
instabilities.
2 Communication
error between the
outdoor unit and
the indoor unit.
ERROR LIST
System
behaviour
Compressor and fan Power supply surge or
are stopped. over voltage.
The system restarts
automatically after
Power supply voltage
3 minutes.
dip or interruption.
Power supply fast
transient or burst.
Bad earth connection.
Bad connection
between outdoor and
the heatsink.
EEV damaged.
Outdoor pcb damaged.
Compressor and fan Bad communication bus
are stopped after connection between
30 seconds of outdoor and indoor
missing unit.
communication.
The system restarts
Normal cable used
automatically as
instead of shielded
soon as the
cable.
communication is
recovered.
Wrong communication
address.
Bad earth connections.
Cause
Check the quality of the power
supply.
Check that all the earth cables are
correctly connected, expecially the
outdoor pcb's earth cable and the
compressor's earth.
Check that the outdoor pcb is
properly connected to the heatsink
and that the screws on the pcb are
properly mounted with the right
torque. Check that there is enough
thermal paste between the pcb and
the heatsink.
Check the EEV functioning. A
malfunctioning on the expansion
valve may cause liquid flood back on
the compressor.
Only if the error is recurrent, change
the outdoor pcb.
Check that connections between C1
and C2 on outdoor and indoor
terminal block is consistent (C1
terminals connected together, C2
terminals connected together).
Be sure to use a shielded
communication cable for serial
connection.
Be sure to have set the correct
address on every indoor unit. Follow
unit specific installation instructions.
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.
Solution