36
FAULT
CAUSE
SOLUTION
RESTART PROCEDURE
AL129 or 390
Circuit 1 Power+ offline
or Alarm Offline Drive
It stops the compressor
Q1 circuit breaker
tripped
Compressor drive
faulty
Check if the electrical
connections are correct. Check
supply voltage and power surges
Contact authorized technical
service
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Open
the electrical box (see point 3)
and reset the Q1 circuit
breaker. Turn the Main power
switch back On
AL562
ABB: Comms Error
It stops the compressor
Communications
with compressor drive
interrupted due to
momentary Power
Supply loss or when
main power switch is
turned On
Check if there have been
interruptions in the power supply
Turn the unit On and Off through
the display, remote On/Off or
webserver, leaving the main power
switch always On
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Turn it
back On after at least 30
seconds have passed
AL012
Tank level alarm
It stops the whole unit
or Pump overload
It stops the whole unit
Level switch did not
switch to the “full”
position
Water leak in the
internal circuit of the
UC
Water leak in the
external water circuit
Water leak in the
water pump
Circuit breaker Q2
has tripped
Check that the level switch works
properly and that the tank is full
enough. After disconnecting the
Main Power switch open the right
panel, open the water tank to
check the water level.
UC 50 to UC 100 only: Lift the
level switch manually. If it works
correctly you should hear its
contact “click”. Close the tank and
the panel and try to start the unit
again
Contact authorized technical
service
Find the leak and get it repaired
Contact authorized technical
service to replace the water pump.
Check that the water quality is
inside the limits (see point 11.1)
Check if the electrical
connections are correct. Check
voltages, intensities and variations.
Check water pressure. Check
water quality. Check if the pump is
blocked
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Turn it
back On after at least 30
seconds have passed
Disconnect the chiller by
turning Off the main power
switch (see point 5.1). Open
the electrical box (see point 3)
and reset the Q2 circuit
breaker. Turn the Main power
switch back On