Oxygen concentrators · EverFlo family

Philips EverFlo: troubleshooting and error codes

The ServiceForge knowledge base holds 49 documented symptoms for the Philips EverFlo, with 67 ranked causes, 82 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Low-pressure reading below 20 psig

Abnormal low-pressure reading measured at 5 LPM flow rate

Ranked causes

1. System leaks (unknown)
2. Tubing damage or blockage (unknown)
3. Fitting damage or leaks (unknown)
4. Dirty filters (unknown)
5. Compressor system pressure loss (unknown)

First check

Measure oxygen percentage at 5 LPM

Test point: Output at 5 LPM
Expected: Normal oxygen percentage

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Impeded oxygen flow patient safety

Yellow LED illuminates continuously, Red LED blinking, audible alarm beeping periodically

Ranked causes

1. Canister to Compressor tubing failure (common)
2. Compressor failure (occasional)
3. Valve Solenoid failure (occasional)
4. Sieve Canister leaking (occasional)

8 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low pressure patient safety

Device producing low oxygen pressure output

Ranked causes

1. Canister to Compressor tubing failure (common)
2. Compressor failure (common)
3. Valve Solenoid failure (occasional)
4. Sieve Canister leaking (occasional)

8 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High pressure patient safety

Device producing excessive oxygen pressure

Ranked causes

1. Pressure relief valve Assembly failure (common)
2. Compressor failure (occasional)
3. Valve Solenoid failure (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inaccurate oxygen readings patient safety

OPI sensor displays incorrect oxygen concentration values

Ranked causes

1. Leaks in OPI sensor lines (common)
2. Main PCA failure (occasional)
3. Compressor failure (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: System oxygen verification (OPI units)

Verify main PCA oxygen concentration output after 10 minute warm-up at 5.0 LPM to confirm proper oxygen purity.

Ranked causes

1. Oxygen concentration below 82% (red LED) (unknown)
2. Yellow or red LED illumination after 10 minutes (unknown)

First check

Plug unit into power outlet

Test point: Power outlet
Expected: Unit receives 120 VAC/60 Hz

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Fluctuations in oxygen pressure or flow ball patient safety

Oxygen pressure or flow ball shows intermittent variations during operation

Ranked causes

1. Pressure Regulator failure (common)
2. Valve Solenoid failure (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low oxygen output patient safety

Device producing lower than normal oxygen concentration or flow

Ranked causes

1. Sieve bed failure (common)
2. Compressor failure (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit will not turn on

Device does not power up when power switch is activated

Ranked causes

1. No power to the unit (common)
2. LED failure (rare)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Audible alarm continuously sounding, all 3 LEDs illuminated patient safety

Audible alarm sounding continuously with all three LEDs lit

Ranked causes

1. System malfunction detected (unknown)

Audible alarm continuously sounding, no LEDs illuminated

Audible alarm sounding continuously with no LED indicators lit

Ranked causes

1. Device not plugged in or power failure (common)

Audible alarm does not sound during startup

No alarm sound for two seconds during initial power-on self-test

Ranked causes

1. Speaker failure or alarm circuit fault (occasional)

First check

Verify audible alarm sounds for two seconds during startup

Test point: Speaker output
Expected: Audible alarm sounds for two seconds

Audible alarm sounding continuously, all 3 LEDs illuminated patient safety

Continuous audible alarm with all three LEDs (Green, Yellow, Red) illuminated

Ranked causes

1. System malfunction detected (unknown)

Audible alarm sounding continuously, no LEDs illuminated caution

Continuous audible alarm with all LEDs dark.

Ranked causes

2. Device turned on but not operating (common)

Calibration: Compressor flow output verification

Verify compressor output pressure and flow rate at 20 psi using test fixture with pressure gauge and flow meter.

Ranked causes

1. Compressor output below specification (unknown)

First check

Verify test fixture assembly per Option 1 or 2 instructions

Test point: All connections and hose clamps
Expected: Secure fittings, no leaks

11 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: EverFlo system final test

Performance verification test after repairs or between patient usages to confirm concentrator operation meets specifications

Ranked causes

1. Routine system verification required (unknown)

First check

Verify unit warm-up time and cabinet installation

Test point: System startup and cabinet assembly
Expected: Unit running for minimum 1 hour with front and back cabinets installed

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: System Final Test parameters

Verification of outlet pressure range and oxygen concentration thresholds during post-repair testing

Ranked causes

1. Calibration reference values required for acceptance (unknown)

First check

Outlet pressure acceptance range

Test point: Outlet barb with pressure gauge at 5 LPM flow
Expected: 5.0-7.0 psig, 5.0-7.0
Tools: Pressure gauge, test flow meter

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: System pressure verification

Procedure to verify system pressure operation of compressor and sieve canister assemblies is within normal ranges for the unit model

Ranked causes

1. Routine calibration and verification (common)

First check

Model 1020000

Test point: System pressure
Expected: 15-27 psi (units without purge valves)

3 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Compressor requires replacement

Compressor has failed and needs to be replaced; unit may not produce oxygen or produce insufficient oxygen flow

Ranked causes

1. Compressor failure (unknown)

First check

Identify compressor type before replacement

Test point: Thomas label on compressor
Expected: 0.38 Compressor shows 1098014 and 2450AE38 numbers; 0.44 Compressor shows 1020070 and 2450AE44 numbers

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Constant Audible Alarm with no LEDs caution

Alarm sounds continuously without any LED indicators illuminated

Ranked causes

1. Fuse Failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Continuous red LED (pressure relief valve activated) patient safety

Red LED illuminates constantly indicating pressure relief valve activation

Ranked causes

1. Low pressure cycle failure (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cooling fan replacement required caution

Cooling fan needs to be removed and reinstalled, or concentrator overheats due to incorrect fan orientation

Ranked causes

1. Fan blade installed concave side facing away from compressor (common)

First check

Visually inspect fan blade orientation

Test point: Cooling fan in front cabinet
Expected: Concave side of blade faces compressor

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Fluctuating pressure

Difference in peak pressure greater than 1 psig during operation

Ranked causes

1. Sieve canister degradation (unknown)

First check

Measure oxygen percentage at 5 LPM

Test point: Output at 5 LPM
Expected: Normal oxygen percentage

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Green LED continuously illuminated, other LEDs off, alarm silent

Green LED on continuously, other LEDs off, audible alarm silent

Ranked causes

1. Device operating normally (common)

Green LED does not stay on after startup

Green LED turns off or fails to remain illuminated after initial startup sequence completes

Ranked causes

1. LED or driver circuit failure (occasional)

First check

Verify green LED remains illuminated after startup

Test point: Green LED
Expected: Green LED stays on

Green LED illuminated continuously, other LEDs off, alarm silent

Green LED lights continuously, red and yellow LEDs are off, and audible alarm is silent.

Ranked causes

1. Device operating normally (common)

Green LED illuminates continuously, other LEDs off, audible alarm silent

Green LED continuously illuminated, Red and Yellow LEDs off, no audible alarm

Ranked causes

1. Device operating normally (common)

High-pressure reading above 25 psig

Abnormal high-pressure reading measured at 5 LPM flow rate at 60 Hz

Ranked causes

1. Improper valve cycling (unknown)

First check

Measure oxygen percentage at 5 LPM

Test point: Output at 5 LPM
Expected: Normal oxygen percentage

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inaccurate oxygen flow patient safety

Flow meter does not display correct oxygen flow rate

Ranked causes

1. Flow Meter failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

LEDs do not light up during startup

When power switch is moved to ON position, LEDs fail to illuminate and audible alarm does not sound

Ranked causes

1. Power supply failure or improper connection (common)

First check

Verify power cord connected to proper power source

Test point: Power outlet
Expected: Power cord seated and outlet functional

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Long Life Filter restricted

Filter may be clogged and restricting airflow through the concentrator

Ranked causes

1. Long-Life Filter restricted or clogged (unknown)

First check

Power up concentrator and set flow rate

Test point: Flow setting
Expected: 5 LPM

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Long-Life Filter restriction detection

Oxygen concentration drops after filter removal, indicating filter blockage requiring replacement

Ranked causes

1. Long-Life Filter restricted or clogged (unknown)

First check

Power up concentrator and set flow to 5 LPM

Test point: Flow control
Expected: 5 LPM

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Loss of power with low pressure patient safety

Device shuts down unexpectedly and produces low pressure output

Ranked causes

1. Compressor thermal switch failure (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low Oxygen percentage indicator not functioning

OPI display does not show oxygen concentration reading

Ranked causes

1. Main PCA failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Outlet pressure not stabilized at startup

Outlet/regulated pressure does not stabilize after unit is powered on and runs

Ranked causes

1. Insufficient warm-up time or pressure regulation fault (common)

First check

Allow unit to run for stabilization time

Test point: Unit operation
Expected: Unit running continuously for at least two minutes

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Outlet pressure out of specification

Pressure gauge reading at outlet does not fall between 5.0 and 7.0 psig when measured at flowmeter set to 5 LPM (1 LPM for pediatric units)

Ranked causes

1. Regulator pressure adjustment out of specification (unknown)

First check

Power up unit and stabilize

Test point: Unit operation
Expected: Unit runs for at least two minutes

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Oxygen output below specification patient safety

Oxygen purity reading at 5 LPM does not meet model-specific minimum requirements when measured with calibrated analyzer

Ranked causes

1. Pressure regulator or sieve canister assembly malfunction (unknown)

First check

Power up concentrator and allow warm-up

Test point: Unit outlet
Expected: Running state after 15 minutes minimum

3 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Peak pressure variation during cycling

Measured peak pressure across four pump cycles varies by more than one psig

Ranked causes

1. Pump or pressure regulator out of specification (unknown)

First check

Install pressure gauge and "T" fitting in pump discharge line

Test point: Sieve canister outlet
Expected: Gauge connected and ready to measure

2 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Power loss alarm does not sound patient safety

When device is disconnected from power source after warm-up, no continuous audible alarm is heard during minimum 7 minutes

Ranked causes

1. Main PCA failure or alarm circuit defect (common)

First check

Connect device to proper power source

Test point: Power input
Expected: Device connected and operational

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Red or yellow LED does not turn off after startup

Red and yellow LEDs remain illuminated after unit startup instead of turning off as expected

Ranked causes

1. Internal component failure or startup incomplete (occasional)

First check

Verify red and yellow LEDs turn off after startup sequence

Test point: LED status
Expected: Red and yellow LED lights go off

Sieve canister assembly needs replacement

Sieve canister assembly removal and installation procedure for EverFlo oxygen concentrators with guidance on purge valve compatibility and integrated valve designs.

Ranked causes

1. Scheduled maintenance or canister degradation (unknown)

18 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Start-up alarms inoperable caution

Alarm system does not function during device startup

Ranked causes

1. Piezoelectric speaker failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

System Final Test after repairs

Performance verification procedure following any repairs to the EverFlo concentrator; results recorded on Testing Data Sheet

Ranked causes

1. Post-repair verification required (unknown)

First check

Run-in and document unit parameters

Test point: Unit label and hour meter
Expected: Minimum 1 hour runtime; serial/model and voltage/frequency recorded

7 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

System pressure out of normal range

Measured system pressure falls outside the documented normal operating ranges for the unit model when tested with pressure gauge connected to Pressure Regulator

Ranked causes

1. Compressor or Sieve Canister Assembly malfunction (unknown)

First check

Run unit with front and rear cabinets in place

Test point: Unit operation
Expected: Unit operates normally

5 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not start after power switch turned on

Power switch moved to ON but unit fails to run

Ranked causes

1. Power not reaching unit (common)

First check

Unit starts running after power switch moved to ON

Test point: Unit operation
Expected: Unit runs

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit is inoperable

Device does not function or respond to control inputs

Ranked causes

1. Main PCA failure (common)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Valve Solenoid replacement required caution

Solenoid valve requires replacement or has failed; three manufacturer types exist (SMC air-piloted original, ASCO air-piloted, ASCO oxygen-piloted current)

Ranked causes

1. Valve Solenoid Assembly worn or defective (unknown)

First check

Identify solenoid valve manufacturer and type

Test point: Valve body markings
Expected: SMC, ASCO air-piloted, or ASCO oxygen-piloted

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Warm cabinet temperature caution

Cabinet or housing is excessively hot

Ranked causes

1. Cooling Fan failure (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Yellow LED blinking, Red LED off, audible alarm beeping periodically patient safety

Yellow LED blinking while Red LED is off and audible alarm beeps periodically

Ranked causes

1. High oxygen flow condition detected (unknown)

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.