Duo™ Service Manual 0070-10-0604-01 4 - 3
Repair Information Troubleshooting Guide
E34 Masimo SpO
2
Pulse
Rate Exceeded
Pulse Rate value exceeds the measurement range
E34 Nellcor SpO
2
PR
Exceeded
Pulse Rate value exceeds the measurement range
E40 Nellcor SpO
2
Interference
Noise is detected on the pulse signal, preventing
pulse discrimination from the noise. The
interference may be due to motion, excess
infrared light or electrical/optical interference.
The message is removed when the noise is
removed
E41 Nellcor SpO
2
Check
Sensor
The Nellcor module senses an unstable or illegal
sensor. This may be due to a poor connection or
a bad sensor. The user is required to reconnect
the same sensor or connect a new sensor. The
message will be removed once the Nellcor
module clears the error
E42 Nellcor SpO
2
Communication Error
The front end module is having problems
communicating (i.e.: framing errors or bad
checksums) with the Nellcor module
E43 Nellcor SpO
2
Weak
Pulse
A pulse rate can not be determined and all other
measurement conditions are normal. The message
is removed when a pulse is detected
E44 Nellcor SpO
2
Weak
Signal
Noise is detected but a pulse rate can not be
discriminated. The message is removed when a
pulse is detected
E45 Nellcor SpO
2
Board
Fault
The SpO
2
board has malfunctioned
E46 Nellcor SpO
2
Motion Motion is detected. The message is removed
when No Pulse status is detected or when motion
ceases
E47 Nellcor SpO
2
Timeout SpO
2
data has been determined continuously for
more than 2 minutes, so SpO
2
data has timed out
from the display
E501 Unit Battery Voltage
Low
Battery voltage is low
E504 Unit Keyboard Error 1 Error with front panel keypad board
E505 Monitor Shut Off
Failure
Monitor cannot be turned off normally
E506 SpO
2
Module Not
Recognized
Monitor cannot communicate with SpO
2
module
during self-test
Error Codes and Solutions (Continued)
MESSAGE/
PROBLEM REASON SOLUTION
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