Problem, Possible cause, Solution – AirSep MN179-1 B User Manual
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MN179-1 _ 02/14 AirSep Corp. - FreeStyle 5 Service Manual
Rev B
Problem
Possible Cause
Solution
Oxygen concentration 
is below specifications 
in test mode.
Unit’s temperature is too 
high. Blocked air intake or 
outlet; or defective fan.
Leak
Restriction in exhaust 
felt.
 
 
 Compressor has reached its
expected life.
Contaminated absorbent beds.
Defective solenoid valve.
Clear any obstruction in
air intake or outlet filter; or
replace fan as needed.
Correct any leaks.
Replace exhaust filter.
Replace compressor.
Replace absorbent beds.
Replace manifold or solenoid
valve.
Unit does not deliver
oxygen.
Cannula kinked or not properly
connected.
FreeStyle 5 is not turned on.
Battery is dead.
Defective AC or DC 
power supply.
OCD sensor defective.
OCD solenoid valve defective.
Check cannula and the
cannula connection.
Turn FreeStyle 5 on to the
prescribed setting.
Replace battery.
Replace AC or DC power 
supply.
Replace FreeStyle 5 
main circuit board.
Replace product manifold or
OCD defective valve.
Unit continuously flows 
oxygen (instead of pulse 
flow delivery).
Defective OCD valve and
volume tank.
.
Replace product manifold.