
Nothing illuminates on the
warming unit panel. • Unit is not turned on, plugged
in, or power cord is not plugged
into an appropriate outlet.
• Unit failure.
• Turn unit on. Make sure the power
cord is plugged into the power entry
module of the warming unit. Make
sure the warming unit is plugged into
a properly grounded outlet.
• Call 3M Patient Wanning Customer
Service.
Alert indicator illuminates and
alert sounds, alphanumeric
display alternately flashes a
temperature of 43°C or higher
and the word “HI.”
Temporary over-temperature
condition because.
• An extreme change in flow
rates occurred (e.g., from 500
mL/min to stop flow).
• Unit was turned on and
reached set point temperature
before cassette was inserted.
• Fluids were prewarmed to
above 42°C before being run
through the warming unit.
• Open flow to reduce temperature.
Alerts will stop when the display
reads 41 °C. The unit is ready to use.
• Alerts will stop when the display
reads 41°C. The unit is ready to use.
• Turn off unit and unplug it.
Discontinue infusion of fluids. Do
not warm fluids before infusing them
through the Ranger warming unit.
Alert sounds, alphanumeric
display and alert indicator light
go dark.
Primary controller failure. Unit
will no longer operate. Power to heating plates will shut off
if temperature rises to 44°C
(warming unit Rev N and newer) or
46°C (wanning units Rev A to M).
Turn unit off and unplug it.
Discontinue use of unit. Discard
disposable set. Alert will continue to
sound if you do not unplug unit. Call
3M Patient Warming Customer
Service.
• Unit alerts soon after plugging
it in (unit does not have to be
turned on for this condition to
occur).
• Heater temperature rises to
k44°C (warming units Rev N
and newer) or 46°C (warming
units Rev A to M) and unit
shuts down soon after plugging
it in (unit does not have to be
turned on for this condition to
occur).
Test screw on bottom of unit is
loose or missing. Make sure test screw is completely
tightened. If it is missing, turn unit
off and unplug it. Call 3M Patient
Warming Customer Service.
Alert sounds but unit has been
turned off. Independent backup safety
system has been activated. Unplug unit.
Call 3M Patient Warming Customer
Service.
Cannot remove cassette from
unit. • Cassette is too full, fluids are
still being infused, or clamp is
open proximal to the cassette.
• Warming unit is below
patient level, creating
• Make sure fluid is drained from
cassette before sliding out the
cassette, that fluids are no longer
infusing, and that clamp is closed
proximal to the warming cassette.
15
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