Marco MAXIBREW 2, Руководство по обслуживанию

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Service Manual MAXIBREW 2 TWIN 25-03-08 Page 22 of 31
4. Technical Data:
4.8. TROUBLE SHOOTIN G – DIA GNOSTIC GUIDE:
The Marco Maxibrew 2 Twin uses an electronic diagnostic system to help determine faults.
If an error is detected a sequence of flashes is displayed through the POWER light –shown in the picture
below.
The length of time and recovery method of each of these flashing displays is detailed below:
2 FLASH CYCLE – BELOW LOW LEVEL
Display pattern:

2 quick flashes then a short pause - repeated.
Electronic check and action:

This indicates that the low level circuit is open i.e. the probe is not in contact with the water.

The element is switched OFF at this stage and the inlet is left ON. (note that if this is a low
probe wiring fault, the water will stop at the high level probe regardless of the status of the
low level).

This is a recoverable error i.e. the machine does not need to be reset when the problem is
solved. (e.g. if a closed mains water stop valve is the problem, opening the valve will allow
water into the machine and normal function will resume when the low level probe is reached)
Probable causes:
1. The water level is below the low level probe, which is normal when the machine fills for the first time.
(Can be flashing for up to 5 min at start up)
2. The low level probe wire is disconnected, or there is another wiring fault (eg. a bad earth (return)
connection between the PCB and the Tank)
Action required:
1. Check that the water pressure is OK and ensure that the stop valve is open.
2. Check that the inlet solenoid is working.
3. If the water level is above the level of the low probe, check the probe circuit wiring
4. Technical Data:
4.8. TROUBLE SHOOTIN G – DIA GNOSTIC GUIDE:
3 FLASH CYCLE – THERMISTOR OPEN CIRCUIT
Display pattern:

3 quick flashes then a long delay (up to 15 seconds) - repeated.
Electronic check:

This indicates that the Thermistor is measuring such a large resistance that it assumes the
thermistor circuit is open.