Chapter 6: Alarms and System Failure Codes
Alarms
6-4 Service Manual
6.1.9 Bed Heater Failure Alarm
This alarm activates only when the canopy is at the bottom position.
Cause or Circumstances Failure Action
The software has turned on the
incubator heater but it is either
not turning on or the current
sense circuit is not detecting
that it is on.
The bed safety thermostat is
open (possibly because the
device was shut down when
the heater was hot).
If the device was shut off when the
heater was hot, allow the fan to run
for several minutes to cool to below
40ºC then power down and back
up. If the failure still persists,
continue.
Defective incubator heater,
thermostat, or wire harness
Check the resistance of the
incubator heater. If defective,
remove the chassis cover and
measure resistance at thermostat
and heaters to determine if heater,
thermostat, or wire harness is
defective.
Defective incubator solid state
relay (SSR)
In service mode, check the voltage
across the control line of the
incubator heater SSR. This control
signal varies between 0 VDC and
about 12 VDC.
If voltage is present replace SSR.
The two SSRs are identical and can
be swapped for troubleshooting. If
no voltage, continue.
Defective 50-pin ribbon cable
between the relay and control
board
Check for continuity on pins 36, 38,
39, and 40 (control signals). If
defective, replace cable. If OK,
continue.
Defective relay board Replace the relay board.
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