Fault, Alert And Reminder Codes; Non-Smartcard Fault Codes - Somnetics Transcend User Manual

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Fault, alert and reminder codes

This section describes four types of fault, alert and reminder codes:
•

Non-smartcard fault codes

•
Smartcard fault codes
•
Alert
•
Filter change reminder
Non-smartcard fault codes
When the CPAP encounters a non-smartcard fault, the processor resets and enters a fault loop. In this loop, the CPAP
repeatedly flashes the yellow fault LED to indicate the specific fault encountered. If the CPAP is reset or power cycled while
in fault mode, it re-enters fault mode upon power up. To exit fault mode, the fault must be acknowledged by holding the
power button down until the fault LED stops flashing. At this point, when the power button is released, the processor resets
and the CPAP powers up in standby mode.
Device LED Fault LED
Off Flashes 2
times
Off Flashes 3
times*
Off Flashes 4
times*
Off Flashes 6
times
Off Flashes 7
times*
Off Flashes 9
times
Off Flashes
11 times
Off Flashes
12 times
Off Flashes
13 times*
Fault, alert and reminder codes
Error Comments
Stack overflow Internal software fault.
Pressure too high While delivering therapy, the pressure sensor measured a pressure
greater than 30 cmH2O. This could be due to a "pinched" or
disconnected pressure sense tube. This could also be due to faulty
pressure sensor or electronics.
No Pressure While delivering therapy, the pressure sensor measured approximately
0 cmH2O. This could be due to an open output hose. This could also be
due to a "pinched" or disconnected pressure sense tube. This could
also be due to faulty pressure sensor or electronics.
Attempt to set An attempt was made to set the CPAP real time clock to an invalid
invalid time value. The CPAP RTC is configured as part of the manufacturing
process, thus this error should only occur then.
Pressure sensor While in standby, the pressure sensor read a value outside its expected
out of range range. This could be due to a "pinched" or blocked pressure sense
tube. This could also be due to faulty pressure sensor or electronics.
Bad firmware At power up, the CPAP calculates a checksum of the firmware code
checksum and compares it against the checksum it calculated when it was initially
programmed. This error indicates some part of the firmware has been
corrupted. Likely causes would be electrostatic discharge or hardware
problem.
Stalled blower While delivering therapy, the CPAP failed to detect any blower motion
for 2 seconds. This is likely due to a faulty blower motor, loose blower
connector or faulty electronics.
Low power While delivering therapy, the CPAP determined that the blower was
stalled (see above). However, a check of the voltage indicates there
may not be sufficient power to spin the blower. This is likely due to a
faulty power supply or battery.
Processor over- The processor on-chip temperature sensor has reported an excessive
temp temperature.
Sleep Apnea Therapy User Manual