omi CHW 09 Bedienungs- Und Wartungsanleitung Seite 31

710.1760.00.03-03A
No. Device Alarm
status code
A01
A02
A05
Fan and
compressor
are not
2
working,
pump is
working
A07
A09
A16
P1 P2
P3 P4
A13
Unit is
3
working
A15
(*) A After fault rectification system is automatically restored to standard setting – M Alarm function restored by settings
Alarm de- Possible cause
scription
Fan is not working fine or
the sense of rotation is not
correct
Refrigerant
Required cooling capacity
high pressure
is higher than nominal
alarm
Air filter dirty (only for
units with this kind of op-
tion)
Unit low on refrigerant
Liquid flow too low
Refrigerant low
Percentage of antifreeze
pressure alarm
too low or not present,
even for range of tempera-
ture higher than 5°C
Dirty evaporator
High liquid
temperature
alarm (if P3 or Required cooling capacity
P4 high temp. is higher than nominal
alarm is pre-
sent)
Percentage of antifreeze
too low
Set point is too low for ac-
tual system
Antifreeze
alarm
Liquid flow too low
Dirty evaporator
Thermal protection of a
new unit are in OFF posi-
Compressor
tion
thermal switche
alarm
Compressor is having
problem
High liquid
temperature
alarm in inlet
Required cooling capacity
line (if P3 or P4
is higher than nominal
high temp.
alarm is pre-
sent)
One of the
Probe can be defective or
probe is defec-
not well connected
tive
Maintenance
Service on unit is required
circuit 1 only on
due to length of work
request
Maintenance
Service on unit is required
circuit 1 only on
due to length of work
request
made on the control unit, procedure as described below.
Recommended remedy
Check fuse of the fan, and
right rotation
Decrease the required cool-
ing capacity
Dismount the filter from the
unit and clean it with air or
with water
Check liquid sight glass and
in case contact service
Check right rotation of pump
and possible obstruction on
liquid circuit
Add antifreeze, or try to in-
crease temperature or flow
of liquid the combination of
these three element can
cause ice problem
Clean evaporator and in case
contact service
Decrease the required cool-
ing capacity
Add antifreeze to the liquid
If possible increase set point,
or check combination of flow,
temperature and antifreeze
percentage
Check right rotation of pump
and possible obstruction on
liquid circuit
Clean evaporator and in case
contact service
Switch MTC in ON
Reset thermal switch and in
case contact of a persistent
problem contact service
Decrease the required cool-
ing capacity
Check connection and in case
change probe
Contact a refrigerant techni-
cian
Contact a refrigerant techni-
cian
31
26/11/2012
Restore (*)
A
becomes
M after 10
events in 1
hour
M
M
M after reset
MTC
A
becomes
M after 3
events in 1
hour
A
M
M