Marco JET 6, Service Manual

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JET6 ServiceManual.docx 29/09/2015 Revision 2 Page 14 of 34
2. The probes are connected incorrectly, so the water reaches the first/lowest probe but it is
incorrectly wired as the high level probe.
3. The low level probe may have become coated in limescale and is not being detected so
water continues to fill the machine until the high level probe is detected.
Action required:
1. Re-wire the probes correctly.
2. Repair the faulty probe/connectors/wiring
3. Descale the low level probe.
HEATER ERROR
Electronic check:
 This indicates that the tank temperature has not risen in 20mins
Probable causes:
1. The element is disconnected or has failed.
Action required:
1. Replace the element.
2. Re-wire the elements correctly, 2.8kW machines should have the lower element connected.
WAIT LOW PRESSURE
Electronic check:
 This indicates that the tank temperature has not dropped in 6mins while the inlet
solenoid is trying to allow in water.

This is a recoverable error. When water is allowed in a temperature drop will occur
and normal operation resumes