Hi Grady, welcome to Apnea Board!
To help diagnose the issue, it should give you an error code of some type.
Is there a specific error code or does it simply say "Service Required"?
Also, does your machine have a smart card? If so, try removing the card and seeing if that solves the problem.
Here are the Error Codes for REMstar Machines:
Error Code - Description - Probable Cause - Corrective Action
E-0 NO_ERROR •Reserved •N/A
E-1 ERR_SOFTWARE •Reserved •Replace Main PCA
E-2 ERR_PROGRAM_CRC_FAILURE •Defective FLASH chip •Replace Main PCA
E-3 ERR_EXTERNAL_RAM_FAILURE •Defective RAM chip •Replace Main PCA
E-4 ERR_FIQ_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-5 ERR_FIQ_STACK_UNDERFLOW •Defective RAM chip •Replace Main PCA
E-6 ERR_NEST_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-7 ERR_NEST_STACK_UNDERFLOW •Defective RAM chip •Replace Main PCA
E-8 ERR_IRQ_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-9 ERR_IRQ_STACK_UNDERFLOW •Defective RAM chip •Replace Main PCA
E-10 ERR_TMR_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-11 ERR_TMR_STACK_UNDERFLOW •Defective RAM chip •Replace Main PCA
E-12 ERR_SVC_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-13 ERR_SVC_STACK_UNDERFLOW •Defective RAM chip •Replace Main PCA
E-14 ERR_THREAD_STACK_OVERFLOW •Defective RAM chip •Replace Main PCA
E-15 ERR_ARM_UNDEFINED_INSTRUCTION_EXCEPTION •Defective FLASH chip •Replace Main PCA
E-16 ERR_ARM_SWI_EXCEPTION •Defective FLASH chip •Replace Main PCA
E-17 ERR_ARM_PREFETCH_EXCEPTION •Defective FLASH chip •Replace Main PCA
E-18 ERR_ARM_ABORT_EXCEPTION •Defective RAM chip •Replace Main PCA
E-19 ERR_ARM_RESERVED_EXCEPTION •Defective FLASH chip •Defective microprocessor •Replace Main PCA •Replace Main PCA
E-20 ERR_AIC_DEFAULT_HANDLER •Defective FLASH chip •Replace Main PCA
E-21 ERR_AIC_SPURIOUS_HANDLER •Defective FLASH or RAM chip •Replace Main PCA
E-22 ERR_CAL_DATA_CRC_FAILURE •Improper calibration •Defective FLASH chip •Recalibrate •Replace Main PCA
E-23 ERR_INVALID_DRIFT_INDEX_AT_CAL •Improper calibration •Occluded or restricted pressure tube •Defective flow sensor •Recalibrate •Replace pressure tube •Replace Main PCA
E-24 ERR_UNRECOGNIZED_CAL_VERSION_BY_SW •Improper calibration •Defective FLASH chip •Recalibrate •Replace Main PCA
E-25 ERR_DRIFT_FLOW_TOO_HIGH •Occluded or restricted pressure tube •Defective flow sensor •Replace Flow Tube •Replace Main PCA
E-26 ERR_UI_DISPLAY_FAILURE •Defective LCD driver chip •Replace Main PCA
E-27 ERR_DRIFT_PRESSURE_TOO_HIGH •Occluded or restricted pressure tube •Defective pressure sensors •Replace pressure tubing •Replace Main PCA
E-28 ERR_CAL_DATA_BLANK •Improper calibration •Defective FLASH chip •Recalibrate •Replace Main PCA
E-29 ERR_DRIFT_SECONDARY_PRESSURE_TOO_HIGH •Occluded or restricted pressure tube •Defective pressure sensors •Replace pressure tubing •Replace Main PCA
E-30 ERR_INVALID_NVDATA_SCHEMA •Normal for first time power up •Defective EEPROM •Remove & restore power •Replace Main PCA
E-31 ERR_INVALID_NVDATA_LOCK •Defective EEPROM •Replace Main PCA
E-32 ERR_INVALID_NVDATA_CHECKSUM •Normal for first time power up •Defective EEPROM •Remove & restore power •Replace Main PCA
E-33 ERR_NVDATA_STORAGE_ERROR •Defective EEPROM •Replace Main PCA
E-34 ERR_NVDATA_QUEUE_FULL •Defective EEPROM •Replace Main PCA
E-35 ERR_NVDATA_READBACK_FAILURE •Defective EEPROM •Replace Main PCA
E-36 ERR_NVDATA_RANGE_FAILURE •Defective EEPROM •Replace Main PCA
E-37 ERR_CORRUPT_RTC_VALUE •Defective microprocessor •Replace Main PCA
E-38 ERR_RTC_NOT_TICKING •Defective microprocessor •Defective crystal •Replace Main PCA •Replace Main PCA
E-39 ERR_UI_QUEUE_FULL •Defective PCA •Replace Main PCA
E-40 ERR_INVALID_BIST_TEST_CALL •Invalid RASP command •Reissue RASP command
E-41 ERR_BIST_THREAD_LOCKED •Defective PCA •Replace Main PCA
E-42 ERR_ALARM_VOLTAGE_FAILURE •Defective power supply •Replace Main PCA
E-43 ERR_12VREF_FAILURE •Defective power supply •Replace Main PCA
E-44 ERR_5VREF_FAILURE •Defective power supply •Replace Main PCA
E-45 ERR_VBULK_FAILURE •Defective power supply •Replace Main PCA
E-46 ERR_NEG15VREF_FAILURE •Defective power supply •Replace Main PCA
E-47 ERR_FL12_SENSOR_RAILED •Occluded or restricted pressure tube •Defective flow sensor •Replace flow tube •Replace Main PCA
E-48 ERR_PV2_SENSOR_RAILED •Occluded or restricted pressure tube •Defective pressure sensor •Replace pressure tube •Replace Main PCA
E-49 ERR_FLASH_FAILURE •Defective FLASH chip •Replace Main PCA
E-50 ERR_UNRECOGNIZED_BOARD_REV •Needs new software •Defective PCA •Replace Main PCA •Replace Main PCA
E-51 ERR_MOTOR_FAILURE •Defective motor drive chip •Replace Main PCA
E-52 ERR_BLOWER_RPM_FAILED_TOLERANCE •Stalled or locked blower •Replace Blower •Replace Main PCA
E-53 ERR_BLOWER_OFF_CURRENT_HIGH •Stalled or locked motor •Defective motor drive chip •Replace Blower •Replace Main PCA
E-54 ERR_BLOWER_ON_CURRENT_HIGH •Stalled or locked motor •Defective motor drive chip •Replace Blower •Replace Main PCA
E-55 ERR_PRINTF_BUFFER_OVERFLOW •Defective PCA •Replace Main PCA
E-56 ERR_THERAPY_EVENT_QUEUE_FULL •Defective PCA •Replace Main PCA
E-57 ERR_KEYPAD_STUCK_KEY •Verify all keys protrude through top •Defective Keypad •Defective pad on PCA •Align keys with top •Replace Keypad •Replace Main PCA
E-58 ERR_UNUSED_58 •Reserved
E-59 ERR_UNUSED_59 •Reserved
E-60 ERR_UNUSED_60 •Reserved
E-61 ERR_UNUSED_61 •Reserved
E-62 ERR_UNUSED_62 •Reserved
E-63 ERR_WATCHDOG_FAILURE •Defective microprocessor •Replace Main PCA
E-64 ERR_UNEXPECTED_WATCHDOG •Defective FLASH chip •Defective RAM chip •Replace Main PCA •Replace Main PCA
E-65 ERR_UNUSED_65 •Reserved
E-66 ERR_RTOS_INIT_FAILURE •Defective PCA •Replace Main PCA
E-67 ERR_SERIAL_QUEUE_FULL •Defective PCA •Replace Main PCA
E-68 ERR_SNORE_SAMPLING_THREAD_LOCKED •Defective PCA •Replace Main PCA
E-69 ERR_MAIN_EXECUTION_THREAD_LOCKED •Defective PCA •Replace Main PCA
E-70 ERR_INTERNAL_RAM_FAILURE •Defective microprocessor •Replace Main PCA
E-71 ERR_EVENT_LOG_QUEUE_FULL •Defective PCA •Replace Main PCA
E-72 ERR_TREND_DIV_BY_ZERO •Defective RAM chip •Replace Main PCA
E-73 ERR_ROLLOVER_CASE •Defective RAM chip •Replace Main PCA
E-74 ERR_WRONG_DISPLAY_TYPE •Defective PCA •Replace Main PCA
E-75 ERR_ALARM_CAPACITOR_FAILURE •Defective PCA •Replace Main PCA
E-76 ERR_OVER_PRESSURE •Occluded or restricted tube •Defective PCA •Replace Pressure tubing •Replace Main PCA
E-77 ERR_UNDER_PRESSURE •Occluded or restricted tube •Defective PCA •Replace Pressure tubing •Replace Main PCA
E-78 ERR_OVER_PRESSURE_REG •Occluded or restricted tube •Defective PCA •Replace Pressure tubing •Replace Main PCA
E-79 ERR_UNDER_PRESSURE_REG •Occluded or restricted tube •Defective PCA •Replace Pressure tubing •Replace Main PCA
E-80 ERR_ROTOR_LOCKED •Locked Motor •Defective PCA •Replace Motor •Replace PCA
E-81 ERR_MOTOR_EDGE_MISSED •Defective Motor •Defective PCA •Replace Motor •Replace PCA
E-82 ERR_MOTOR_EDGE_EXTRA •Defective Motor •Defective PCA •Replace Motor •Replace PCA
E-83 ERR_MOTOR_OVERSPEED •Defective Motor •Defective PCA •Replace Motor •Replace PCA
E-84 ERR_MOTOR_BRAKE •Defective Motor •Defective PCA •Replace Motor •Replace PCA
E-85 ERR_MOTOR_CURRENT •Defective Motor •Defective PCA •Replace Motor •Replace PCA
E-86 ERR_INVALID_ERROR_CODE •Reserved
6.5 SmartCard Error Codes:
Code Label - User Action
C-1 SMARTCARD_12C_WRITE_FAIL Card inserted upside-down. Remove card and reinsert properly. Otherwise, card is corrupt and should be reprogrammed.
C-2 SMARTCARD_BAD_CARD_TYPE Card is not supported by this device. Otherwise, card is corrupt and should be reprogrammed.
C-3 SMARTCARD_BAD_CIB_VERSION Card is corrupt and should be reprogrammed.
C-4 SMARTCARD_SCRIPT_DURING_PROVIDER_MODE Remove card. Exit Provider Mode screens. Then reinsert card.
C-5 SMARTCARD_PRESENT_IN_CAL_MODE Remove card. Exit Calibration Mode. Then reinsert card.
C-6 SMARTCARD_BAD_CIB_CHECKSUM Card is corrupt and should be reprogrammed.
C-7 SMARTCARD_NOT_PRESENT
C-8 SMARTCARD_12C_READ_FAIL Card inserted upside down. Remove card and reinsert properly. Otherwise, card is corrupt and should be reprogrammed.
C-9 SMARTCARD_WRITE_CONFIRM_FAIL Card is corrupt and should be reprogrammed. Otherwise, replace card.
C-10 SMARTCARD_BAD_RI_BRAND Card is corrupt and should be reprogrammed.
C-100 SMARTCARD_BAD_CPB_CHECKSUM Card is corrupt and should be reprogrammed.
C-101 SMARTCARD_BAD_CPB_VERSION Card is corrupt and should be reprogrammed.
C-102 SMARTCARD_INVALID_UNIT
C-103 SMARTCARD_UNKNOWN_CPB_FORMAT Card contains a prescription format that is not supported. Perhaps card is intended for another device.
C-104 SMARTCARD_UNKNOWN_CPB_PRESCRIPTION Card contains a prescription type that is not supported. Perhaps card is intended for another device.
C-105 SMARTCARD_SCRIPT_PARM_RANGE Card contains prescription settings that are outside of this device’s range. Perhaps card is intended for another device.
C-106 SMARTCARD_BAD_CPB_SCRIPT_READY Card is corrupt and should be reprogrammed.
C-107 SMARTCARD_BAD_CPB_START_ADDR Card is corrupt and should be reprogrammed.
C-108 SMARTCARD_BAD_CPB_END_ADDR Card is corrupt and should be reprogrammed.
C-109 SMARTCARD_BAD_CPB_ERASE_PERMISSION Card is corrupt and should be reprogrammed.
C-200 SMARTCARD_BAD_CDCB_VERSION Card is corrupt and should be reprogrammed.
C-201 SMARTCARD_BAD_CDB_VERSION Card contains a storage format that is not supported. Perhaps card is intended for another device.
C-202 SMARTCARD_BAD_CDCB_CHECKSUM Card is corrupt and should be reprogrammed.
C-203 SMARTCARD_BAD_CDCB_CONTROL_BLOCKS Card is corrupt and should be reprogrammed.
C-204 SMARTCARD_BAD_CDCB_START_ADDR Card is corrupt and should be reprogrammed.
C-205 SMARTCARD_BAD_CDCB_END_ADDR Card is corrupt and should be reprogrammed.
C-206 SMARTCARD_BAD_CDB_START_ADDR Card is corrupt and should be reprogrammed.
C-207 SMARTCARD_BAD_CDB_END_ADDR Card is corrupt and should be reprogrammed.
C-300 SMARTCARD_BAD_UIDB_VERSION Card is corrupt and should be reprogrammed.
C-301 SMARTCARD_BAD_UIDB_CHECKSUM Card is corrupt and should be reprogrammed.
C-302 SMARTCARD_BAD_UIDB_START_ADDR Card is corrupt and should be reprogrammed.
C-303 SMARTCARD_BAD_UIDB_END_ADDR Card is corrupt and should be reprogrammed.
C-400 SMARTCARD_BAD_DDCB_VERSION Card is corrupt and should be reprogrammed.
C-401 SMARTCARD_BAD_DDCB_CHECKSUM Card is corrupt and should be reprogrammed.
C-402 SMARTCARD_BAD_DDCB_PROFILE_CONTROL_BLOCKS Card is corrupt and should be reprogrammed.
C-403 SMARTCARD_BAD_DDCB_HISTOGRAM_CONTROL_BLOCKS Card is corrupt and should be reprogrammed.
C-404 SMARTCARD_BAD_DDCB_FOSQ_COMPL_CONTROL_BLOCKS Card is corrupt and should be reprogrammed.
C-500 SMARTCARD_FILE_OPEN_FAIL Card is corrupt and should be reprogrammed.
C-501 SMARTCARD_FILE_TELL_FAIL Card is corrupt and should be reprogrammed.
C-502 SMARTCARD_FILE_SEEK_FAIL Card is corrupt and should be reprogrammed.
C-503 SMARTCARD_FILE_READ_FAIL Card is corrupt and should be reprogrammed.
C-504 SMARTCARD_FILE_WRITE_FAIL Card is corrupt and should be reprogrammed.
C-505 SMARTCARD_FILE_GET_PTR_FAIL Card is corrupt and should be reprogrammed.
C-506 SMARTCARD_FILE_SET_PTR_FAIL Card is corrupt and should be reprogrammed.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.