GE Giraffe - System Failure 16; System Failure 18

Cause(s) Action(s)
Defective heater isolation
transformer
If voltage is present at primaries but no voltage output at secondaries,
replace the heater isolation transformer.
Defective DAC circuit on control
board.
If failure persists, replace control board.
Defective solid state relay (SSR)
Power up the unit in service mode. Run status test on the second service
screen and verify that the I/HTROFF (incubator heater o) test fails. If the
status test fails, then it is an SSR problem. If the status test does not fail,
then try the recommended action for a defective current sense circuit on
relay board, below.
Defective incubator heater SSR
Disconnect the black wire (larger diameter) from the AC side of the
incubator heater solid state relay. Run status test. If I/HTROFF test passes
replace the incubator heater SSR. If it still fails reconnect the wire to the
SSR.
Defective current sense circuit on
relay board.
Replace relay board.
Defective 50-pin ribbon cable If failure persists, replace 50 pin ribbon cable.
4.4.14 System Failure 16
System failure 16 indicates: When the unit performed Power-on Self Test, the incubator heater could not be
turned o.
Cause(s) Action(s)
If this error occurs
during System
Calibration
Reconnect J1, J2 and J4 on the control board. Put JP1 in Normal position. (Refer to
section “3.3 System Calibration” on page 21.) Power up unit in normal operating mode
and follow instructions for the error that occurs.
Defective incubator
heater SSR
Disconnect the black wire (larger diameter) from the AC side of the incubator heater
solid state relay. Run status test. If I/HTROFF (incubator heater o) test passes replace
the incubator heater SSR. If it still fails reconnect the wire to the SSR.
Defective current
sense circuit on relay
board.
If failure persists, replace relay board.
4.4.15 System Failure 18
System failure 18 indicates: Defective Variables.
Cause(s) Action(s)
Defective SRAM circuit on control board. Replace the control board.
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Chapter 4: Troubleshooting