Troubleshooting Chart A - DeVilbiss 525DS Service Manual

TrouBleSHooTing cHarT a

visible alarm
oFF
other Symptoms
Pulsating air noise
Excessive noise
Fluctuating oxygen flow
Little or no oxygen flow
Low oxygen concentration
Audible alarm does not
sound during power failure
Audible alarm does not sound when
unit is turned "On"
Pressure relief valve activated -
"popping" sound
Service Required light does not
illuminate when unit is turned "On"
LT-2023
T r o u B l e S H o o T i n g
audible alarm
oFF
Possible cause
Intake filter not in place or defective
Compressor intake hose disconnected
Loose or defective motor mounts
Defective compressor
Defective cooling fan
Occluded humidifier
Use of improper humidifier
Occluded filters
Occluded or defective cannula and tubing
Use of excess oxygen tubing
Defective flow meter
Leak in system
Defective compressor
Defective compressor reed valve
Defective check valve
Pressure regulator not adjusted
properly or defective
Flow meter not adjusted properly
Hose disconnected to flow meter
Oxygen delivery tubing is kinked or blocked
Occluded humidifier
Leak in system
Defective sieve bed check valve
Defective compressor reed valve
Defective compressor
Rotary valve not operating correctly
Occluded filters
Contaminated sieve beds
Unit has not been used for an extended
period of time. noTe–If the concentrator
has been unused for an extended period,
the unit must run several minutes before
the power fail alarm will activate.
Defective PC board
Defective power switch
Defective wire harness
Defective PC board
PC board connectors not properly latched
Defective PC board
Defective rotary valve
PC board connectors not properly latched
Defective PC board
Defective light
compressor
on
Possible remedy
Check filter and replace if necessary
Reconnect hose
Replace motor mounts
Replace compressor
Replace cooling fan
Clean or replace humidifier
Use only a bubble-type humidifier
Clean or replace filters
Detach cannula from oxygen delivery tubing. If
proper flow is not attained, check tubing for
kinks or other obstructions. Clean or straighten
as required or replace tubing if necessary.
The unit is designed to deliver 5 lpm with a
cannula on 50 feet (15 meters) of approximately
5/32" (4 mm) inside diameter tubing. Smaller
diameter tubing or the addition of any other
flow restriction may prevent obtaining the
desired flow rate.
Replace flow meter
Check for leaks in all hoses and fittings
Replace compressor
Replace compressor reed valve
Replace check valve
Adjust or replace pressure regulator
Adjust flow meter
Reconnect hose
Straighten tubing or remove obstruction
Clean or replace humidifier
Check for leaks in all hoses and fittings
Replace check valve
Replace compressor reed valve
Replace compressor
Replace valve
Clean or replace filters
Replace sieve beds
Allow unit to run for 20 minutes and retry
Replace PC board
Replace power switch
Replace wire harness
Replace PC board
Be sure tabs are pushed completely into place
Replace PC board
Replace valve
Be sure tabs are pushed completely into place
Replace PC board
Replace light
10
Power light
on