GE b30, Technical Reference Manual

Page: 229 / 252

Troubleshooting
8-29
Document no. 2044677-001
7 Troubleshooting
7.1 Troubleshooting chart for recorder unit
7.2 Troubleshooting chart for CO
2
measurement
Problem Cause What to do
Module not responding to front panel
key, but operates through Recorder
menu. Membrane switch cable loose or
broken. Check the cable. Replace the
front panel if necessary.
Recorder will not start.
No error messages shown. Recorder: Module not properly
inserted. Re-insert the module properly.
Recorder: Flex-strip cable broken. Check the cable. Replace if
necessary.
Recorder board faulty. Replace the recorder board.
Recorder unit faulty. Replace the recorder unit.
Recorder works but nothing appears
on the paper. Active side of the paper downwards. Turn the paper roll over.
To test which side is active:
Place the paper on a hard
surface and draw a line with a
fingernail - a dark line will
appear on the active (thermal)
side.
Recorder unit faulty. Replace the recorder unit.
Problem Cause/What to do
No response to breathing Sampling line or water trap blocked or loose, or improperly attached.
Water trap container full.
See the gas sampling system troubleshooting.
‘SENSOR INOP.’ message The temperature is too low or high, check the temperature in the service
menu. Supply voltage is too low or high, IR source current or voltage is
too low or high, check current in the service menu.
Pump is not working properly, check sample flow and pump voltage in
the service menu.
Ambient pressure too low or high, check the ambient pressure in the
service menu.
Zero valve not working properly, check the functionality by switching
zero valve on and off in the service menu.
‘ZEROING ERROR’ message Gas zeroing failed. Condensation or residual gases are affecting the zero
measurement. Allow the module to run drawing room air for half an hour
and calibrate again.
‘CHECK D-FEND’ message
Amb – Work pressure difference too small.
Probably water trap or the sampling line is not attached properly. Gas
zero valve failure. Pump failure or gas outlet blockage.