4000 4-/5-Gas Measuring Instruments Unit
Service Manual 5-25
Primary error symptom Primary cause
(of error)
Secondary cause of
error
Possible tests/
establishing cause
Remedy
Pressure sensor
measuring
instruments unit
(465) faulty
All hoses and flow
rates OK but
measurement value
0 or 255 (raw data)
(465)
Replace sensor
Replace Andros main
board
Replace measuring
instruments unit
Hose disconnected
inside
Is there a leak error? Hold the hose
closed after the O
2
sensor: the pressure
must increase to
855 mbar (registered
at the measuring
instruments unit)
Connect hose
Hose pinched
inside or outside
(after measuring
instruments unit)
Pressure
measurement value
255 (raw value
measuring
instruments unit)
Check flow rates Replace hose
AVL 4000 pneumatics pressure sensor
faulty
Setpoint: 118…138
with pump
switched off
Replace sensor
Replace board
Pressure reducer throttle in AVL 4000
pneumatics system faulty
Setpoint must
increase (128 ± 10 )
when pump
switched on and
inlet is closed off
Replace pressure
reducer throttle in
silicon hose
Pressure measurement
value incorrect
Pressure reducer throttle in the Andros
measuring instruments unit (blue
connector) faulty
Pressure
measurement value
OK, no leaks,. but
no response when
hose held closed
after O
2
sensor
Replace pressure
reducer or drill
0.1 mm hole
Measuring instruments unit has been
replaced but value not entered
Compare PEF on
instrument and PEF
in service mode,
value must be
between 490 and
540
Enter PEF correctly
on sticker
Detector replaced
and value not
entered
Serial number may
be different or
000000
As above Correct PEF
PEF factor incorrect
Stored value
incorrect
Replace measuring
instruments unit
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