Sequential compression devices · Flowtron family

Arjo Flowtron Universal AC600: troubleshooting and error codes

The ServiceForge knowledge base holds 17 documented symptoms for the Arjo Flowtron Universal AC600, with 29 ranked causes, 39 diagnostic checks with test points and expected values, and 3 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 alarm (LO) caution

Low pressure detected during cycle operation; device alarmed with audible signal, red lights flashing, and LCD message

Ranked causes

1. Garment hose disconnected at garment end (common)
2. Loose fitting garment (common)
3. Garment leak (common)
4. Kinked tube to transducer (occasional)
5. Damaged or disconnected internal tube (occasional)
6. Damaged hose set assembly (occasional)
7. Blocked air filters (occasional)
8. Motor and manifold assembly failed (rare)
9. Compressor assembly failure or low output (rare)

First check

Hose connected at garment end?

7 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

High pressure alarm (HI) caution

High pressure detected during cycle; garment or hose kinked or obstructed

Ranked causes

1. Garment hose kinked (common)
2. Hose set assembly kinked (common)

First check

Garment hose clear and unkinked?

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

Power supply PCB assembly handling high voltage

Safety precautions when handling power supply PCB assembly due to high voltage and electrostatic discharge risk

Ranked causes

1. Exposure to lethal voltages on power supply PCB assembly when mains power is connected (common)
2. Electrostatic discharge damage to power supply PCB assembly (common)

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

Pressure transducer output incorrect

Output Pressure reading on LCD display does not match external pressure meter during calibration test.

Ranked causes

1. Zero calibration offset incorrect (common)
2. Gain calibration offset incorrect (common)

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

Pump fault alarm caution

Pump control circuit or power supply failure detected immediately; audible alarm sounds

Ranked causes

1. Control PCB faulty (occasional)
2. Power supply PCB faulty (occasional)

First check

Control PCB functioning correctly?

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

Air inlet filter requires replacement

Air inlet filter on compressor assembly needs periodic replacement for proper equipment operation

Ranked causes

1. Air inlet filter clogged or degraded (unknown)

First check

Remove rear case from pump

Test point: Rear case
Expected: Rear case detached

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

Calibration: pressure transducer accuracy

Verify pressure transducer output matches expected values on LCD display to confirm measurement accuracy

Ranked causes

1. Pressure transducer drift or inaccuracy (rare)

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

Hose set assembly damage caution

Screw cover hinges on hose set assemblies split, requiring full assembly replacement

Ranked causes

1. Repeated hose set removal (common)

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

Hose set assembly integrity compromised caution

Elbow retaining cover screws may split if hose set assemblies are removed and reinstalled multiple times

Ranked causes

1. Repeated removal and reinstallation of hose set assemblies (common)

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

Lo Alarm - Garment unplugged not triggered on disconnection patient safety

When garment is disconnected during operation, pump does not detect fault and display does not show Lo Alarm - Garment unplugged message within expected time.

Ranked causes

1. Pump pressure sensor not detecting garment disconnection (unknown)

First check

Disconnect garment during pump operation

Test point: Garment connection to hose set assembly
Expected: Lo Alarm - Garment unplugged flashes on LCD within one complete inflation cycle (30-72 seconds)

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Motor and manifold assembly replacement caution

Procedure to install motor and manifold assembly onto control PCB and top case assemblies after removal or repair.

Ranked causes

1. Motor and manifold assembly removed for service (common)

First check

O-ring correctly installed on each hose set elbow connector

Test point: Hose set elbow connectors
Expected: O-ring present and properly seated

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

Pump Fault - RFID error during calibration caution

LCD display shows Pump Fault - RFID error when attempting RFID calibration

Ranked causes

1. Hose set electrical connections not fitted correctly at pump end (common)

First check

Inspect hose set electrical connections at pump end

Test point: pump connector interface on hose set assembly
Expected: connections fitted securely and correctly oriented

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

Pump fault RFID alarm caution

Hose set electrical connections not properly fitted to pump; RFID tag not reading correctly

Ranked causes

1. Hose set electrical connections loose or disconnected (common)

First check

Hose set electrical connections properly seated?

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

Pump fault step alarm caution

Motor and manifold assembly malfunction detected; stepper motor or manifold failure

Ranked causes

1. Motor and manifold assembly failed (occasional)

First check

Motor and manifold assembly functioning correctly?

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

Real time clock loses time and date settings

Control PCB battery disconnected longer than 20 seconds, clock requires reloading from PC-based service tool

Ranked causes

1. Battery disconnected or depleted (common)

First check

Ensure battery swap completed within 20 seconds

Test point: 2-pin battery cable connector at PCB Con 5
Expected: Old battery disconnected and new battery connected with no gap exceeding 20 seconds

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

Replace power supply PCB assembly high voltage

Procedure for installing power supply PCB onto front case with battery pack connector and sealing strips

Ranked causes

1. Power supply PCB assembly replacement or reinstallation (unknown)

First check

Verify power supply PCB assembly is properly seated on front case

Test point: Fig 51, Item 10
Expected: Assembly flush with front case

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

Service maintenance due high voltage

Routine 12-month service inspection of pump components for damage, wear and operational function

Ranked causes

1. Scheduled 12-month maintenance interval (common)

First check

Inspect outer casing

Test point: Outer casing
Expected: No damage; case secure

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

Error codes

Code	Meaning	Trigger	Severity
`Lo Alarm - Garment leak`	Pressure loss detected in garment indicating possible leak	Pressure drop detected during garment inflation cycle	warning
`Lo Alarm - Garment unplugged`	Garment has been disconnected from hose set assembly or connection lost	Garment disconnected during operation; no pressure detected within one inflation cycle	warning
`Pump Fault - RFID`	RFID calibration or communication failure on pump hose set assemblies	occurs during RFID calibration process when electrical connections at pump are faulty	error

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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.