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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.

29 error codes

CodeMeaning
001The AirSense 10 runs a controlled speed ramp when therapy starts. If the blower motor doesn't hit its minimum operating RPM within that startup window, the device logs Error 001 and kills therapy. It's different from Error 12, which fails mid-session. This one's specifically a startup problem, usually fixable without touching any internal hardware.
highbeginner
006Error 006 on the ResMed AirSense 10 is a therapy alert that fires when the device's leak detection algorithm catches a sustained leak it can't compensate for on its own. Unlike the hardware E-codes like Error 12, this doesn't mean something broke inside. It's the machine saying the pressure isn't getting where it needs to go because air's escaping somewhere in the mask interface.
moderatebeginner
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 means the device's pressure relief system got triggered by an abnormally high pressure event. Either the motor tried to drive pressure beyond the safe range, or the pressure sensor caught an anomaly that forced the relief valve to activate. It's a pressure regulation problem inside the device, not a mask or leak issue.
highbeginner
21Error 21 means the AirSense 10 detected a sustained leak that blew past what it could compensate for. ResMed defines a large leak as more than 24 L/min above the mask's normal vent flow. Once that threshold is crossed and stays there, the machine can't hold your prescribed pressure and logs the error.
moderatebeginner
24When Error 24 fires, your AirSense 10's climate control subsystem detected an out-of-range temperature reading or a complete loss of signal from the heating element. Basically the sensor that's supposed to confirm the humidifier or ClimateLine tube is heating correctly can't verify that, so the machine shuts the whole heating circuit down to protect itself.
moderatebeginner
AIR-WARMWhen a ResMed AirSense 10 or 11 delivers air that feels uncomfortably warm, the Climate Control humidity and heated tubing settings are set too high for the current room temperature. The HumidAir heats water to create moist air, and the ClimateLineAir tubing keeps it warm to prevent rainout. If either's set too aggressively, what comes out of the mask feels hot and stifling.
lowbeginner
DIAG-MODEDiagnostic mode is a hidden service menu built into ResMed AirSense devices. It shows real-time sensor readings, motor RPM, pressure output in cmH2O, error logs with timestamps, and cumulative therapy hours. It's intended for DME providers and sleep techs, but patients can totally access it for troubleshooting.
lowbeginner
DIAG-STUCKThe AirSense 10 and 11 run a startup self-test that checks blower motor speed, pressure calibration, and flow sensor accuracy. When this test hangs, the firmware's stuck waiting for a sensor value it's not getting. Usually it's a temporary corrupted state in memory, not a busted part.
moderatebeginner
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.
moderatebeginner
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.
moderatebeginner
HOS Panic 06HOS Panic 06 on the ResMed AirSense 10 is a hardware operating system panic, basically a firmware-level crash where the device's embedded OS hit a fatal error it couldn't recover from on its own. The unit locks up and shows the code until you power-cycle it. It's a software fault, not a hardware component failure, and it resolves with a reset the vast majority of the time.
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. Knowing 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.
moderatebeginner
HUMID-FAULTThe ResMed HumidAir heated humidifier connects to the AirSense 10 and 11 base via gold contact pins that carry both power and data signals. When those pins can't make a clean connection, the water doesn't warm up and your air arrives bone dry at the mask. It's usually dirty contacts or a failed heating plate inside the chamber.
moderatebeginner
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.
moderatebeginner
LEAK-WATERWater leaking from your ResMed means either warm humid air is condensing inside the tubing before it reaches your mask (that's rainout), or the HumidAir water chamber is physically leaking from a crack, an overfill, or a worn gasket. Both are fixable. One's free, the other costs about $30.
lowbeginner
MOTOR-LIFEThe AirSense 10 tracks every hour that blower spins and hits you with this message after roughly 20,000 hours of runtime. It's not a malfunction, it's basically a scheduled maintenance flag baked into the firmware. The device keeps working normally, but ResMed can't guarantee the motor's hitting your exact prescribed pressure consistently anymore.
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 they develop predictable issues over time. Problems fall into three buckets: air delivery (leaks, pressure, noise), climate control (humidifier faults, rainout, dry mouth), and device errors (screen failures, motor life warnings). Most of what you're seeing isn't the machine dying, it's the machine asking for basic maintenance.
moderatebeginner
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.
moderateintermediate
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's 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's blowing too much air, the device is delivering pressure at or near the maximum setting in its AutoSet range. On AutoSet models, it 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.
moderatebeginner
WONT-TURN-ONA ResMed AirSense 10 or 11 that won't turn on has zero response when you hit the Start/Stop button. No screen, no fan, no nothing. It's almost always a power delivery failure rather than internal hardware damage. The AirSense runs off a separate 24V DC external power supply, and that brick is where failures happen most often.
highbeginner