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ErrBase

Resmed Cpap Error Codes

All Resmed cpap error codes with step-by-step troubleshooting, multimeter specs, and OEM part numbers.

31 error codes

CodeMeaning
001Error 001 on the ResMed AirSense 10 is a motor startup fault code indicating the blower motor failed to reach its target speed within the expected startup window. The device initiates a controlled ramp-up sequence when therapy begins - if the motor does not accelerate to the minimum operating RPM within this window, Error 001 is logged and therapy is terminated. This is distinct from Error 12 (full motor failure) in that the motor attempted to start but could not complete the startup sequence.
highbeginner
006Error 006 on the ResMed AirSense 10 is a therapy alert code indicating the device detected an abnormal condition during therapy - most commonly a sustained mask leak above the threshold, an incorrect mask detection, or a sensor anomaly. Unlike hardware E-codes (such as Error 12), the 006 code does not indicate a failed internal component and often resolves after a device restart and mask refit.
mediumbeginner
1Error 1 on the ResMed AirSense 10 means the device's flow sensor detected airflow lower than expected for the current motor speed and pressure setting. This indicates the motor is running but producing insufficient airflow to meet the prescribed therapy pressure. The fault can stem from a blocked air path, a partially failing motor, or a flow sensor that is reading incorrectly.
highbeginner
12Error 12 on the ResMed AirSense 10 and AirSense 11 means the blower motor has failed, stalled, or is drawing abnormal current. The AirSense 10 uses a brushless DC blower motor that is sealed inside the device chassis and is not user-accessible or user-replaceable. When Error 12 appears the device cannot deliver pressurized air, and therapy stops immediately.
criticalbeginner
13Error 13 on the ResMed AirSense 10 indicates the device's pressure relief system was triggered by an abnormally high pressure event - either the motor attempted to drive pressure beyond the safe operating range, or the pressure sensor detected an anomaly that forced the relief valve to activate. This error suggests a problem with pressure regulation within the device and not a mask or leak issue.
highbeginner
21Error 21 on the ResMed AirSense 10 indicates the device measured a sustained large leak during therapy that exceeded the recoverable threshold. ResMed defines a large leak as airflow exceeding 24 L/min beyond the intentional mask vent flow. When this level is sustained the device cannot maintain prescribed pressure, therapy effectiveness is compromised, and Error 21 is logged.
mediumbeginner
24Error 24 on the ResMed AirSense 10 indicates a fault in the ClimateLine or HumidAir climate control system - specifically that the device's heated humidifier or heated tube temperature sensor is reporting an out-of-range condition or a heating element failure. The climate control subsystem on the AirSense 10 manages both the HumidAir heated chamber and the optional ClimateLine heated tube, and Error 24 fires when this system cannot maintain or verify the target temperature.
mediumbeginner
6Error 6 on the ResMed AirSense 10 is a mask leak detection error where the device's flow sensor has identified airflow leaving the circuit outside of the expected mask vent pattern. Error 6 is closely related to Error 21 but fires at a lower leak threshold or in response to an abrupt leak event rather than a sustained one. It signals that the therapy circuit integrity has been compromised at the mask interface.
mediumbeginner
AIR-WARMWhen a ResMed AirSense 10 or 11 delivers air that feels uncomfortably warm, the Climate Control humidity and heated tubing settings are typically set too high for the current room temperature. The HumidAir humidifier heats water to create warm moist air, and the ClimateLineAir heated tubing maintains that warmth to the mask. If either is set too aggressively, the delivered air can feel hot and stifling.
lowbeginner
DIAG-MODEDiagnostic mode on ResMed AirSense devices is a hidden service menu that displays sensor readings, motor RPM, pressure measurements, error logs, and cumulative therapy hours. It is intended for DME providers and sleep technicians but can be accessed by patients for troubleshooting.
lowbeginner
DIAG-STUCKThe ResMed AirSense 10 runs a periodic self-diagnostic that checks motor function, pressure calibration, and sensor readings. If this diagnostic hangs or freezes, the device becomes unresponsive and cannot be used for therapy until the diagnostic completes or the device is power cycled. This is a software hang, not a hardware failure in most cases.
mediumbeginner
DRY-MOUTHDry mouth during CPAP therapy on a ResMed AirSense 10 or 11 means either the humidification level is too low, or the user is breathing through their mouth while using a nasal mask or nasal pillows. Mouth breathing bypasses the humidified nasal airway and exposes the mouth and throat to dry pressurized air. This is one of the most common reasons patients stop using their CPAP.
lowbeginner
HEAT-ERRORHeating System Error on the ResMed AirSense 10 or 11 specifically indicates a fault in the heating plate circuit that warms water in the HumidAir chamber. Unlike a general humidifier fault which may be a connection issue, this error points to an electrical failure in the heating element itself or the device-side driver circuit that powers it. The device continues to deliver therapy but without heated humidification.
mediumbeginner
HIGH-LEAKThe ResMed AirSense 10 and 11 calculate unintentional mask leak in real-time and display a 'High Leak' warning when the leak rate exceeds approximately 24 L/min for a sustained period. High leak reduces therapy effectiveness because the device cannot maintain target pressure. The leak rate is logged in the myAir app and on the SD card data.
mediumbeginner
HOS Panic 06HOS Panic 06 on the ResMed AirSense 10 is a hardware operating system panic code - a firmware-level crash where the device's embedded OS encountered a fatal error it could not recover from. The code is displayed on the device screen and the device is unresponsive until power-cycled. This is a software fault, not a hardware component failure, and it almost always resolves with a factory reset.
highbeginner
HUBResMed AirSense 10 and AirSense 11 devices display error codes when the device detects a hardware fault, sensor failure, firmware crash, or therapy-affecting condition. ResMed uses three distinct code families: numerical E-codes for device-level hardware faults (Error 1, 6, 12, 13, 21, 24), three-digit alert codes for therapy alerts (001, 006), and HOS Panic codes for hardware OS-level firmware crashes. Understanding which family the code belongs to tells you immediately whether the device needs service, a reset, or a simple user adjustment.
highbeginner
HUMID-ERRORA humidifier fault message on the ResMed AirSense 10 or 11 means the device detected a problem with the HumidAir heated humidifier module. The fault can indicate corroded contact pins preventing electrical connection, a failed heating plate inside the water chamber, or a device-side circuit issue. The device can still deliver therapy without humidification when this fault is active.
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HUMID-FAULTThe ResMed HumidAir heated humidifier connects to the base of the AirSense 10 and 11 via gold contact pins that carry both power and data signals. When the humidifier is not working, the water does not warm up and air arrives dry at the mask. The most common cause is corroded or dirty contact pins between the water chamber and the device base, followed by a failed heating plate inside the chamber.
mediumbeginner
KEEPS-OFFA ResMed AirSense 10 or 11 that repeatedly shuts off during therapy is usually caused by the SmartStart/SmartStop feature misinterpreting brief mask repositioning as therapy end. SmartStop detects when breathing stops at the mask and automatically powers down the motor. This feature can also be triggered by high mask leak, aggressive EPR settings, or intermittent power supply issues.
mediumbeginner
LEAK-WATERWater leaking from a ResMed CPAP means condensation is forming inside the tubing (called rainout) and dripping toward the mask, or the HumidAir water chamber itself is leaking from a crack, overfilling, or worn seal gasket. Rainout happens when warm humidified air cools as it travels through unheated tubing in a cold room.
lowbeginner
MOTOR-LIFEThe AirSense 10 tracks cumulative motor run hours and displays 'Motor Life Exceeded' after approximately 20,000 hours of use. This is a maintenance reminder, not an error - the device continues to deliver therapy normally. ResMed uses this counter to flag devices that have exceeded the expected blower motor lifespan.
lowbeginner
NOISEA ResMed AirSense 10 or 11 making unusual noise during therapy can indicate several things depending on the sound type. A buzzing or vibration usually means the device is sitting on a resonant surface. Grinding suggests motor bearing wear. Whistling points to a mask or tubing air leak. Gurgling means water in the tubing. The AirSense 10 normally produces a smooth, low hum at about 26 dBA.
lowbeginner
NOT-WORKINGA ResMed CPAP that is 'not working' covers a broad range of symptoms - from no power at all, to powering on but not delivering air, to delivering air but not treating apnea effectively. The diagnosis depends on identifying which specific function has failed: power delivery, motor operation, pressure regulation, humidification, or data reporting.
highbeginner
PRESSURE-HIGHThe ResMed AirSense 10 and 11 AutoSet models automatically adjust pressure between a minimum and maximum range (typically 4-20 cmH2O) based on real-time detection of apnea and hypopnea events. When therapy pressure feels too high, the device is responding to detected breathing events by increasing pressure to keep the airway open. The maximum pressure can only be adjusted through the clinical settings menu.
lowintermediate
PROBLEMSResMed AirSense 10 and AirSense 11 CPAP machines are reliable, but over time they develop predictable issues ranging from mask leaks and humidifier faults to motor noise and pressure drift. Most problems fall into three categories: air delivery (leaks, pressure, noise), climate control (humidifier, water leaks, dry mouth), and device errors (screen failures, diagnostic hangs, motor life counters).
mediumbeginner
RESETResetting a ResMed AirSense 10 or 11 restores user-accessible settings (comfort preferences, ramp, EPR, climate control, alarms) to factory defaults and clears stored therapy data. Clinical pressure settings are not affected by a user reset - they require the provider access code. A hard power cycle (unplugging for 60 seconds) resolves firmware freezes without clearing data.
lowbeginner
SCREEN-FAULTA blank or unresponsive screen on the ResMed AirSense 10 or 11 while the device still delivers therapy indicates an LCD backlight failure or loose internal ribbon cable. The display module is separate from the therapy engine - the motor, pressure sensor, and all therapy functions can operate independently of the screen. A dead screen does not mean the device is dead.
mediumintermediate
SNOWFLAKEThe snowflake icon on the ResMed AirSense 10 and 11 appears when the HumidAir humidifier detects that the ambient room temperature is too cold for effective heated humidification. It is a status indicator, not an error code. The device continues therapy normally when the snowflake is displayed, but the humidifier reduces or disables heating to prevent condensation buildup in the tubing.
lowbeginner
TOO-MUCH-AIRWhen a ResMed AirSense 10 or 11 feels like it is blowing too much air, the device is delivering pressure at or near the maximum setting in its AutoSet range. On AutoSet models, the device automatically adjusts pressure between a minimum and maximum (typically 4-20 cmH2O) based on detected apnea and hypopnea events. The sensation of too much air usually means the max pressure needs lowering or the ramp feature needs enabling.
lowbeginner
TROUBLESHOOTA systematic troubleshooting guide for ResMed AirSense 10 and AirSense 11 CPAP machines covering the most frequently reported issues. This guide walks through a logical diagnostic sequence - power and startup, air delivery, humidification, mask and leak, and device errors - to isolate the root cause before contacting your DME provider.
mediumbeginner
WONT-TURN-ONA ResMed AirSense 10 or 11 that will not turn on has no response when the Start/Stop button is pressed - no screen illumination, no fan spin, no indicator lights. This is almost always a power delivery issue rather than an internal device failure. The AirSense power supply is a separate external brick that converts AC wall power to 24V DC, and it is the most common single point of failure.
highbeginner