Marco JET 6, Service Manual

Page: 12 / 34

JET6 ServiceManual.docx 29/09/2015 Revision 2 Page 12 of 34
8. DIAGNOSTICS:
TROUBLESHOOTING
– LCD DIAGNOSTIC GUIDE:
The Jet 6 uses an electronic diagnostic system to help determine faults. If an error is detected a
message is displayed through the LCD screen.
Note: Back Door PIN Code is 1793
– used if PIN is activated but not known
THERMISTOR ERROR
Electronic check:
 This indicates that the thermistor is possibly measuring such a large resistance that it
assumes the thermistor circuit is open.

This indicates that the thermistor is possibly measuring zero resistance. It assumes
the thermistor has failed sort circuit.

The element and inlet valve are turned OFF when this error is detected
 This is a recoverable error. When the correct range of resistance is measured, normal
operation resumes
Probable causes:
1. The thermistor probe is unplugged from the 4way connector on the PCB or the thermistor
has failed open circuit.
2. The thermistor has failed in a closed circuit manner.
Action required:
1. Check that the thermistor is plugged in to the PCB correctly. If it is, replace the thermistor.
OVERFILL ERROR
Electronic check:
 This indicates that the overflow water level probe has been reached

The element and inlet valve are turned OFF when this error is detected