Marco MAXIBREW 2, Руководство по обслуживанию

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Service Manual MAXIBREW 2 TWIN 25-03-08 Page 23 of 31

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.
Action required:
1. Check that the thermistor is plugged in to the PCB correctly. If it is, replace the thermistor.
4 FLASH CYCLE (Heat Fill Mode Only) – NOT HEATING
Display pattern:

4 quick flashes then a short pause - repeated.
Electronic check:

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:
1. All the elements have failed
2. Wiring fault
Action required:
1. Check that the resistance on the elements. If there is a reasonable resistance (15-25
Ω
)on the element it
probably has not failed, so the wiring might be at fault. NOTE: for this error to be displayed all
elements would have to fail.
5 FLASH CYCLE – THERMISTOR SHORT CIRCUIT
Display pattern:

5 quick flashes then a short pause - repeated.
Electronic check:

This indicates that the Thermistor is 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:
2. The thermistor has failed.
Action required:
2. Replace the thermistor.
4. Technical Data:
4.8. TROUBLE SH OOTIN G – DIA GNOSTIC GUIDE:
6 FLASH CYCLE (Heat Fill Mode Only) – NOT FILLING
Display pattern:

6 quick flashes then a short pause - repeated for approx 2min. Then normal function
resumes for 1min30secs – then flashes for 2min again – this cycle is repeated.
Electronic check:

This checks that the inlet solenoid valve is not kept ON for more than 1min30secs when in the
heat fill cycle. Note: this error is only checked once the water level has reached the low level
probe and the machine has begun the heat fill cycle.

This is a recoverable error. In the heat fill cycle, even with reasonably low water pressure the
inlet solenoid valve usually only stays ON for approx 5-6 seconds. If the inlet valve stay ON
for more than 1min30secs, there is a problem with the inlet valve or the mains water supply.
After 1min30seconds the 6 flash cycle is displayed for 2min – the inlet solenoid valve is turned
OFF during this time. After this 2min cycle, normal operation resumes i.e. the machine
attempts to fill by opening the inlet solenoid valve once more. If after 1min30secs no water has
come into the machine, the 6flash sequence is displayed again. This cycle is repeated.