System Failure 15 - GE Giraffe Service Manual

Chapter 4: Troubleshooting

4.4.13 System Failure 15

System failure 15 indicates: Safety Relay 1 test failure. Unable to turn incubator heater on or off by switching
safety relay 1. When troubleshooting this error code, have on hand at least the 50 pin ribbon cable.
Cause(s)
If this error occurs during system
calibration, J1, J2, and J4 were
not unplugged, or calibration
jumper JP1 is not installed
properly.
Air temperature sensor is above
40C at power-up.
Defective sensor in compartment
air probe.
Defective compartment air probe
cable
No output from heater isolation
transformer. Defective relay
board.
42
Action(s)
Before calibrating make sure J1, J2 and J4 on the control board are
disconnected. Verify jumper JP1 is correctly positioned. (Refer to section
"3.3 System Calibration" on page 21.)
If the unit was shut off when the heater was hot, allow the fan to run for a
few minutes to cool to below 40C, then power down and back up.
Disconnect connector J1 from the control board. Power cycle the unit. If
the error clears either the compartment air probe or the air probe cable
is defective. Reconnect J1 and disconnect the compartment air probe
connector at the compartment probe. If the unit now powers up OK the
compartment air probe is defective.
If system failure 15 persists with connector J1 connected, and the
compartment air probe disconnected, then the compartment air probe
cable is defective.
In service mode, check the output voltage of the heater isolation
transformer at the one pin connectors on the black and white wires on
the transformer secondary. This secondary voltage should always read
115 volts.
• If 115 volts is present, then replace the relay board.
• If 115 volts is not present, check that the mains voltage is input to the
transformer primaries.
• Be sure J49 on the relay board is properly connected.
• Verify the configuration plug on the transformer primary is seated
properly.
To measure primary input voltage on 115 volt units:
• Verify mains voltage is present at pins 2-5 (brown and orange wires)
on the transformer primary configuration plug.
• Verify mains voltage is present at pins 3-6 (yellow and blue wires) on
the transformer primary configuration plug.
To measure primary input voltage on 230 volt units:
• Verify mains voltage is present at pins 2-6 (brown and blue wires) on
the transformer primary configuration plug .
• If voltages are not present, verify mains voltage is present at pins 1-4
(black and red wires) on the transformer primary configuration plug.
• If not, replace the relay board.
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