Infant flow drivers · Infant Flow family

Vyaire Mk II Infant Flow Driver: troubleshooting and error codes

The ServiceForge knowledge base holds 11 documented symptoms for the Vyaire Mk II Infant Flow Driver, with 14 ranked causes, 11 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

Unit does not pass performance verification test patient safety

One or more calibration checks fail to meet specification requirements

Ranked causes

1. Mixer output does not meet ±3% accuracy specification (unknown)
2. Oxygen analyzer readings outside tolerance range (unknown)
3. Pressure manometer does not track accurately (unknown)
4. Alarm functions do not operate correctly (unknown)

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

Air inlet filter inspection

Inspect air inlet filter for dirt or moisture contamination. Replace if dirty or wet.

Ranked causes

1. Air inlet filter dirty or wet (occasional)

First check

Observe air inlet filter condition

Test point: Air inlet filter
Expected: Clean and dry

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

Calibration: Air/oxygen mixer and electronic pressure manometer

Periodic 4-monthly calibration check of air/oxygen mixer blender output and electronic pressure manometer required.

Ranked causes

1. Mixer or pressure manometer calibration drift (unknown)

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

Calibration: Electronic safety relief valve regulator setting patient safety

Verify electronic patient safety relief valve regulator pressure setting

Ranked causes

1. Electronic regulator requires periodic verification (common)

First check

Measure regulator output pressure

Test point: Pressure regulator outlet (disconnected from solenoid)
Expected: Between 160 & 180 mm Hg, 160-180 mm Hg
Tools: Mercury column or accurate pressure measuring device

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

Calibration: Oxygen analyzer

Fuel cell oxygen analyzer requires regular calibration check to ensure accurate display readings at 21% and 100% oxygen concentrations.

Ranked causes

1. Oxygen analyzer drift or miscalibration (common)

First check

Set mixer to 21% oxygen and verify display reading

Test point: Oxygen display
Expected: 21%

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

Calibration: Safety pressure relief valve setting patient safety

Verify mechanical safety relief valve is set to protect equipment and delivery circuit

Ranked causes

1. Safety pressure relief valve requires periodic verification (common)

First check

Measure pressure at fully occluded delivery tube

Test point: Patient circuit
Expected: 205 cm H2O, ±20 cm H2O
Tools: Calibrated water column or pressure measuring system

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

Check alarm system integrity patient safety

Periodic checking of alarm systems integrity required as part of routine maintenance.

Ranked causes

1. Alarm system malfunction or failure (unknown)

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

Check exterior air filter condition caution

Exterior air filter visible through polycarbonate bowl; replace if discolored or wet.

Ranked causes

1. Discolored or wet exterior air filter (occasional)

First check

Inspect exterior air filter through polycarbonate bowl

Test point: Air filter
Expected: Clear, dry, no discoloration

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

Flowmeter calibration drift

Flowmeter indicates incorrect flow rate compared to test device

Ranked causes

1. Flowmeter requires recalibration (common)

First check

Verify flowmeter reading against external test device

Test point: Outlet of Infant Flow Driver
Expected: Within ±10% of test device reading lpm, ±10%
Tools: Test flowmeter or flow test device

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

Oxygen sensor end of life

Oxygen sensor no longer calibrates accurately or reaches one year of service

Ranked causes

1. Oxygen sensor aged beyond useful life (1 year typical) (common)

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

Oxygen sensor replacement caution

Oxygen sensor must be changed annually or when calibration is no longer possible. Device must be disconnected from power before replacement.

Ranked causes

1. Annual oxygen sensor replacement or failed calibration (common)

First check

Allow oxygen sensor to stabilize after installation

Test point: Time elapsed
Expected: 2 hours minimum

1 more check with pass and fail actions, 2 corrective actions, and part numbers 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.