Humidifiers · AIRVO family

Fisher & Paykel Healthcare AIRVO 2: troubleshooting and error codes

The ServiceForge knowledge base holds 21 documented symptoms for the Fisher & Paykel Healthcare AIRVO 2, with 65 ranked causes, 52 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

Check for blockages (E121)

Unit displays blockage alert. Flow may be restricted in tube, chamber, filter, or patient interface.

Ranked causes

1. Non-return valve flaps displaced in water chamber (common)
2. Water chamber overfilled above black line (occasional)
3. Heated breathing tube blocked or kinked (common)
4. Patient interface blocked or kinked (common)
5. Wrong tube mode for interface (Default mode with Junior tube) (occasional)
6. Unsuitable cannula in use (occasional)
7. Air filter dirty or significantly discolored (common)
8. Foreign object blocking air filter or holder (occasional)
9. Device operating above 2,000 meters altitude (rare)

First check

Inspect non-return valve position

Test point: Left-hand chamber port interior silicone flaps
Expected: Flaps in correct vertical position

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

O2 too low patient safety

Oxygen level has fallen below minimum allowed threshold (typically 25%). Displayed on screen or as alert.

Ranked causes

1. Oxygen flow rate set too low or flow meter adjustment needed (common)
2. Oxygen source not turned on (common)
3. Oxygen source empty or faulty (occasional)
4. Oxygen inlet kit not installed correctly or tubing kinked (common)
5. Oxygen tubing not securely connected to device (common)
6. Insufficient device warm-up time (occasional)
7. Minimum oxygen limit set to 25% threshold reached (occasional)

First check

Verify oxygen flow rate

Test point: Oxygen flow meter setting on source
Expected: Flow rate sufficient to maintain >25% (or set limit)

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

Check for leaks (E122) patient safety

Unit displays leak alert. Water or humidified air escaping from chamber, tube, or interface connection.

Ranked causes

1. Water chamber not fitted correctly or not fully inserted (common)
2. Black O-ring missing or damaged on heated tube connection (common)
3. Heated breathing tube not attached correctly (common)
4. Patient interface not properly connected to tube (common)
5. Wrong tube mode for interface (Junior mode with Default tube) (occasional)
6. Air filter or filter cover not correctly fitted (occasional)

First check

Verify water chamber insertion

Test point: Water chamber and finger guard at connector
Expected: Finger guard fully clicked into place

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Check water

Water supply exhausted or not reaching chamber. Device displays alert prompting refill or chamber replacement.

Ranked causes

1. Water bag empty (common)
2. Water chamber empty or damaged (occasional)
3. Kink in fluid line preventing water flow (common)
4. Vent cap on water bag closed (common)

First check

Check water bag status

Test point: Water bag indicator or by weight
Expected: Water bag contains sufficient water

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

Error code displayed: disinfection tube error range 34-37, 42-43, 70-73, 75-78

Unit displays error code related to disinfection tube or cycle failure

Ranked causes

1. Disinfection cycle interrupted or components changed mid-cycle (common)
2. Disinfection tube connection issue (occasional)
3. Air filter or breathing tube connection issue (occasional)
4. Faulty disinfection tube (occasional)

First check

Verify disinfection cycle status before error occurred

Test point: User observation of cycle progress
Expected: Clear information on cycle stage when error appeared

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

Cannot reach target flow

Unit cannot achieve the desired flow rate setting. Alert prompts user to confirm operation at lower achievable rate.

Ranked causes

1. Target flow setting exceeds patient interface capability (common)
2. System blockage or restricted flow (common)
3. Device operating above 2,000 meters altitude (rare)

First check

Confirm user decision to proceed

Test point: Mode button on display
Expected: User presses mode button to accept lower flow rate

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

Error code displayed: brownout error 161

Unit displays error code 161 indicating low mains supply voltage condition

Ranked causes

1. Low mains supply voltage (brownout condition) (common)
2. Electrical interference from nearby equipment (occasional)
3. Unit power supply internal failure (rare)

First check

Check for nearby high-power electrical equipment

Test point: Power outlet surroundings
Expected: No heavy loads on same circuit

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

Error code displayed: chamber error range 61-69, 74, 91-106

Unit displays error code related to chamber malfunction or temperature measurement

Ranked causes

1. Environmental temperature extremes or chamber overfill (common)
2. Chamber connection issue (occasional)
3. Temperature sensor malfunction (occasional)

First check

Check environmental temperature

Test point: Room environment
Expected: Room temperature within normal operating range

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

Error code displayed: flow error range 121-122 patient safety

Unit displays error code indicating flow measurement or delivery failure

Ranked causes

1. Breathing tube blockage or leak (common)
2. Air filter blockage (occasional)
3. Unit internal flow sensor or motor failure (occasional)

First check

Verify prior blockage or leak alarm display

Test point: Unit display history
Expected: User recalls 'Check leaks' or 'Check blockages' message

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

Error code displayed: heated breathing tube error range 11-33, 38-41, 44-50, 141-157 patient safety

Unit displays error code related to heated breathing tube malfunction

Ranked causes

1. Breathing tube connection issue (common)
2. Faulty breathing tube (occasional)
3. Unit hardware failure (rare)

First check

Verify breathing tube connection

Test point: Tube connection port
Expected: Tube fully seated and secure

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

Unit does not turn on

Device does not power up when ON/OFF button is pressed. May have broken display but be operating.

Ranked causes

1. Power cord not plugged into mains or device (common)
2. Power outlet not working (common)
3. Broken display (occasional)

First check

Press and hold ON/OFF button

Test point: ON/OFF button
Expected: Device turns on or audible alarm sounds

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

Cannot reach target temperature

Device cannot achieve the desired temperature setting. Humidity level may be compromised. Most common at high flow in cold environment.

Ranked causes

1. Operating at high flow rate in cold ambient room (common)
2. Ambient room temperature below 18°C (64°F) (common)

First check

Check ambient room temperature

Test point: Ambient environment
Expected: Room temperature 18°C (64°F) or above

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

Check tube (E38)

Alert displayed on screen or auditory signal indicating heated breathing tube fault. Tube may be disconnected, damaged, or improperly attached.

Ranked causes

1. Heated breathing tube not attached correctly (common)
2. Heated breathing tube visibly damaged (common)

First check

Verify tube attachment

Test point: Heated breathing tube connection port
Expected: Tube seated firmly and alarm clears

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

Error code displayed: internal error range 81-85, 111, 171

Unit displays error code indicating internal processing or logic failure

Ranked causes

1. Environmental shock or temporary malfunction (occasional)
2. Internal circuit or microprocessor failure (rare)

First check

Document error details and triggering event

Test point: Unit display and user observation
Expected: Clear record of error code and preceding action

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

Error code displayed: motor error range 1-10

Unit displays error code between 1-10 indicating motor-related failure

Ranked causes

1. Environmental shock or moisture exposure (occasional)
2. Motor component failure (occasional)

First check

Check for physical damage from dropping or shaking

Test point: Unit exterior and internal components
Expected: No visible damage or moisture

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

Error code displayed: oxygen sensor error range 181-192 patient safety

Unit displays error code related to oxygen sensor malfunction or signal failure

Ranked causes

1. Environmental temperature extremes affecting sensor (common)
2. Oxygen sensor degradation or failure (occasional)

First check

Check operating environment temperature

Test point: Room where unit is used or stored
Expected: Temperature within normal range, not cold or hot

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

Error code displayed: temperature error range 131-135 patient safety

Unit displays error code indicating temperature measurement or control failure

Ranked causes

1. Environmental temperature extremes (common)
2. Chamber or tube temperature sensor malfunction (occasional)

First check

Check operating environment temperature

Test point: Room where unit is in use
Expected: Temperature within normal operating range (not cold or hot)

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

O2 too high patient safety

Oxygen concentration has risen above maximum allowed threshold. Displayed on screen or as alert.

Ranked causes

1. Oxygen flow rate set too high (common)
2. Oxygen limit threshold set too high (occasional)

First check

Reduce oxygen flow rate

Test point: Oxygen flow meter on source
Expected: Oxygen level reduced below set maximum

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

Check operating conditions

Device displays alert indicating abnormal operating environment. Often triggered by sudden ambient temperature changes.

Ranked causes

1. Ambient room temperature below 10°C or above 30°C (common)

First check

Verify ambient temperature within range

Test point: Ambient environment
Expected: Room temperature 10–30°C (50–86°F)

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

Condensation prevention and management

Condensation build-up in heated breathing tube during operation. Risk higher in cold, humid environments or with cooling sources.

Ranked causes

1. Ambient room temperature below 18°C or local cooling source (common)

First check

Verify ambient temperature in optimal range

Test point: Ambient room environment
Expected: Temperature 18–28°C (64–82°F)

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

Power out (black screen)

Display is completely black and auditory alarm sounds for at least 120 seconds.

Ranked causes

1. Dislodged or disconnected power cord (common)

First check

Inspect and reseat power cord

Test point: Power cord connections at outlet and device
Expected: Cord fully inserted and secured

1 corrective action 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.