Huntleigh Flowtron AC550, Service Manual

Page: 21 / 42

3.0.0.1 Fault Codes and Counter Measures
247901 3-3 Issue 1
March 1998
MESSAGE User
Mode
Service Mode
Fault
Detection
Protocol
Possible Causes
User
Faults
Possible Causes
Pump
Faults
Effect
Reset Method
Lo
L4
A
single
event
where
no
pressure
greater
than
4mmHg,
is
detected
for
135
secs.,
which
then
activates
the
alarm.
During
this
period,
a
Lo
message
briefly
appears
on
the
display,
at
30
sec.
intervals,
but
not
necessarily
in
synchronisation
with
the
air
output.
Both
supply
tubes
disconnected
at
the
garment
connectors.
Rotary
valve
failed
in
the
closed
position Compressor
failure.
Pressure
control
valve
fault.
No
inflation
of
both
garments.
1
normal
cycle,
or
power
reset.
FF
3
Pressure
greater
than
72mmHg
detected
for
6
secs.,
which
then
activates
the
alarm.
N/A
Pressure
control
can
be
set
too
high,
due
to
incorrect
adjustment. Monitoring
PCB
system,
pressure
display/calibration fault.
Garment pressure
is
higher
than
the
therapeutic recommendation s
Power
reset
only.
FF
4
Pressure
greater
than
15mmHg
detected
for
40
secs.,
which
then
activates
the
alarm.
Note
:
Constant
high
priority
alarm
note.
N/A
Valve
failed
in
the
fully
open
position.
Constant inflation
of
the
garment,
giving
a
tourniquet
effect.
Power
reset
only.