Marco Beverage Systems Ecoboiler UC45 1000743, Руководство по обслуживанию

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Service manual April 2017 Ecoboiler UC45 Page 8 of 28
3 FLASH CYCLE
– THERMISTOR OPEN CIRCUIT
Display pattern:
•
3 flashes then a short pause - repeated.
Electronic check
and action:
•
This indicates that the Thermistor is measuring such a large resistance
that it assumes the thermistor circuit is open.
•
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:
•
The thermistor probe is unplugged from the 4way connector on the PCB
or the thermistor has failed open circuit.
Action required:
•
Check that the thermistor is plugged in to the PCB correctly. If it is,
replace the thermistor.
4 FLASH CYCLE
– NOT HEATING
Display pattern:
•
4 flashes then a short pause - repeated.
Electronic check
and action:
•
This checks that the temperature is increasing when the heater is on.
•
Measures the rate that the temperature increases in a specified time.
This error is only displayed after 20 mins of the heater being on
continuously. When the error is detected, the element and inlet valve are
turned off.
•
This is a non-recoverable error. The machine needs to be reset when
this problem is solved.
Probable causes:
•
The elements have failed
•
Wiring fault
Action required:
•
Check that the resistance on the elements. If there is a reasonable
resistance (15-
25Ω)on the element it probably has not failed, so the
wiring might be at fault.
5 FLASH CYCLE
– THERMISTOR SHORT CIRCUIT
Display pattern:
•
5 flashes then a short pause - repeated.
Electronic check
and action:
•
This indicates that the Thermistor is measuring zero resistance. It
assumes the thermistor has failed short 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:
•
The thermistor has failed.
Action required:
•
Replace the thermistor.