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Philips-Respironics error codes

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This is a listing of CPAP Error Codes and descriptions for Philips-Respironics 50-series and 60-series System One REMstar and BiPAP machines.

We do have the Service & Repair manuals for these and other CPAP machines available. To access them, you will need to join the Apnea Board Forum, log in, and then go to our Private Files and Links area, below the forums. In that forum, there is a post that says "Links to Members-Only Files". If you open that post, you can click on our current link to the Members Only Files. Please keep in mind that we do not have additional Service/Repair Manuals other than those listed on our Members Only Files page.

Types of Error Codes

The four Error Types are described as follows:

Error Type Description
STOP The error information is recorded in NVRAM and the unit is placed into Safe State. The only functionality available to the user is serial communication, turning off the audible alarm via a key press and removing power.
REBOOT The error information is recorded in NVRAM and the unit is rebooted. This error is promoted to a STOP level error by use of the Verbose Mode configuration flag.
CONTINUE The error information is recorded in NVRAM and the unit continues to operate without noticeable alteration. This error is promoted to a STOP level error by use of the Verbose Mode configuration flag.
LOG_ONLY The error information is recorded in NVRAM and the unit continues to operate without noticeable alteration. This error is not promoted to a STOP level error by use of the Verbose Mode configuration flag.



General Errors

Error Code Description Type
E-1 ERR_SOFTWARE_STOP STOP
E-2 Not Used N/A
E-3 ERR_INT_RAM REBOOT
E-4 ERR_NULL_PTR REBOOT
E-5 ERR_DATA REBOOT
E-6 ERR_STATE_MACHINE REBOOT
E-7 ERR_SOFTWARE REBOOT
E-8 Not Used N/A
E-9 Not Used N/A


Watchdog and Timer Errors

Error Code Description Type
E-10 ERR_WDOG_TEST_RAM REBOOT
E-11 ERR_WDOG_TEST REBOOT
E-12 ERR_BACKGROUND_WDOG_NO_CARD REBOOT
E-13 ERR_BACKGROUND_WDOG_SD_CARD REBOOT
E-14 ERR_WDOG_LOWRES_TIMER REBOOT
E-15 ERR_CYCLE_HANDLER_OVERRUN REBOOT
E-16 ERR_RASP_RESTORE_TIMEOUT CONTINUE
E-17 ERR_ONEMS_HANDLER_OVERRUN REBOOT
E-18 Not Used N/A
E-19 ERR_WDOG_TIMEOUT REBOOT

Motor / Blower Errors

Error Code Description Type
E-20 ERR_MOTOR_SPINUP_FLUX_LOW REBOOT
E-21 ERR_MOTOR_VBUS_HIGH STOP
E-22 ERR_MOTOR_FLUX_MAGNITUDE REBOOT
E-23 ERR_MOTOR_OVERSPEED REBOOT
E-24 ERR_MOTOR_SPEED_REVERSE REBOOT
E-25 ERR_MOTOR_THERMISTOR_OPEN CONTINUE
E-26 ERR_MOTOR_THERMISTOR_SHORTED CONTINUE
E-27 ERR_MOTOR_RL_NOCONVERGE STOP
E-28 ERR_NEGATIVE_QUADRATURE_VOLTAGE REBOOT
E-29 ERR_VBUS_GAIN_ZERO: REBOOT
E-30 ERR_MOTOR_SPINUP_FLUX_HIGH REBOOT
E-31 thru E-39 Not Used N/A


NVRAM Low Level Errors

Error Code Description Type
E-40 ERR_NVRAM REBOOT
E-41 ERR_STORAGE_UNIT_RAM REBOOT
E-42 ERR_UNABLE_TO_OBTAIN_BUS REBOOT
E-43 ERR_NVRAM_NO_CALLBACK_OCCURRED REBOOT
E-44 ERR_NV_BUFFER_NULL REBOOT
E-45 ERR_NV_CALLBACK_NULL REBOOT
E-46 ERR_NV_ZERO_LENGTH REBOOT
E-47 ERR_NVRAM_INVALID_BYTES_XFRRED REBOOT
E-48 Not Used N/A
E-49 Not Used N/A


NVRAM Unit Related Errors

Error Code Description Type
E-50 ERR_DAILY_VALUES_CORRUPT LOG_ONLY
E-51 ERR_CORRUPT_COMPLIANCE_LOG CONTINUE
E-52 ERR_CORRUPT_COMPLIANCE_CB CONTINUE
E-53 ERR_COMP_LOG_SEM_TIMEOUT CONTINUE
E-54 ERR_COMPLOG_REQS_OVERFLOW REBOOT
E-55 ERR_THERAPY_QUEUE_FULL CONTINUE
E-56 ERR_COMPLOG_PACKET_STATUS REBOOT
E-57 ERR_SESS_OBS_QUEUE_OVF REBOOT
E-58 ERR_SESS_OBS_NO_CALLBACK REBOOT
E-59 Not Used N/A


General Hardware Errors

Error Code Description Type
E-60 ERR_UNSUPPORTED_HARDWARE REBOOT
E-61 ERR_PLL_UNLOCKED REBOOT
E-62 ERR_STUCK_RAMP_KEY CONTINUE
E-63 ERR_STUCK_KNOB_KEY CONTINUE
E-64 ERR_DSP_OVERTIME_PWM REBOOT
E-65 ERR_STUCK_ENCODER_A CONTINUE
E-66 ERR_STUCK_ENCODER_B CONTINUE
E-67 Not Used N/A
E-68 Not Used N/A
E-69 Not Used N/A


Pressure Sensor Errors

Error Code Description Type
E-70 ERR_PRESSURE_SENSOR_ABSENT STOP
E-71 Not Used N/A
E-72 ERR_PSENS_UNABLE_TO_OBTAIN_BUS REBOOT
E-73 ERR_SENSOR_PRESS_OFFSET_STOP STOP
E-74 Not Used N/A
E-75 Not Used N/A
E-76 Not Used N/A
E-77 Not Used N/A
E-78 Not Used N/A
E-79 Not Used N/A


Flow Sensor Errors

Error Code Description Type
E-80 ERR_UNABLE_TO_INIT_FLOW_SENSOR REBOOT
E-81 ERR__FLOW_SENSOR_TABLE CONTINUE
E-82 ERR_FLOW_SENSOR_OFFSET CONTINUE
E-83 ERR_FSENS_UNABLE_TO_OBTAIN_BUS REBOOT *
E-84 ERR_FLOW_SENSOR_ STOP STOP
E-85 ERR_FLOW_SENSOR_OCCLUDED CONTINUE
E-86 ERR_FLOW_SENSOR_ABSENT CONTINUE
E-87 ERR_FLOW_SENSOR_BUS CONTINUE
E-88 Not Used N/A
E-89 Not Used N/A

*On E-83, upon reboot, a second failure results in a STOP level error.

OTP and RTC Errors

Error Code Description Type
E-90 ERR_OTP_NOT_CONFIGURED STOP
E-91 ERR_OTP_INCORRECTLY_CONFIGURED STOP
E-92 Not Used N/A
E-93 ERR_RTC_VALUE CONTINUE
E-94 ERR_RTC_STOPPED CONTINUE
E-95 thru E-99 Not Used N/A

HUMIDIFIER Errors

Error Code Description Type
E-100 ERR_HUMID_NO_HEAT CONTINUE
E-101 ERR_HUMID_TEMP_MAX STOP
E-102 ERR_THERMISTOR_HIGH CONTINUE
E-103 ERR_THERMISTOR_LOW CONTINUE
E-104 ERR_HUMID_AMBIENT_OFF CONTINUE
E-105 ERR_HUMID_AMBIENT_COMM CONTINUE
E-106 thru E-109 Not Used N/A

Stack and Exception Handler Errors

Error Code Description Type
E-110 ERR_STACK REBOOT
E-111 ERR_EXCEPTION_STACK_OVERFLOW REBOOT
E-112 ERR_EXCEPTION_STACK_RESERVE LOG_ONLY
E-113 ERR_EXCEPTION_STACK_UNDERFLOW REBOOT
E-114 ERR_FIQ_STACK_OVERFLOW REBOOT
E-115 ERR_FIQ_STACK_RESERVE LOG_ONLY
E-116 ERR_FIQ_STACK_UNDERFLOW REBOOT
E-117 ERR_IRQ_STACK_OVERFLOW REBOOT
E-118 ERR_IRQ_STACK_RESERVE LOG_ONLY
E-119 ERR_IRQ_STACK_UNDERFLOW REBOOT
E-120 ERR_SVC_STACK_OVERFLOW REBOOT
E-121 ERR_SVC_STACK_RESERVE LOG_ONLY
E-122 ERR_SVC_STACK_UNDERFLOW REBOOT
E-123 ERR_DATA_ABORT_EXCEPTION REBOOT
E-124 ERR_PREFETCH_EXCEPTION REBOOT
E-125 ERR_SWI_ABORT_EXCEPTION REBOOT
E-126 Not Used REBOOT


See Also

Philips-Respironics DreamStation error codes

REMstar error codes (for older, pre-2007 REMstars)

REMstar smart card error codes




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