Marco Ecoboiler WMT5 - CALIBRATION; TROUBLESHOOTING

Service Manual Ecoboiler wallmount 1000671 100676 061010 Page 5 of 18
3.3. CALIBRATION
The Ecoboiler control PCB (1600345) has the ability to have the desired set-point temperature at
whatever setting is required. During manufacture of the PCB it is set to the default temperature of
around 95°C.
If the temperature setting needs to be modified on-site please follow the steps below:
1. To Enter Calibration mode:
a. Turn the machine off at the mains power supply.
b. Then, whilst depressing the tactile switch on the PCB, turn the mains power back on.
c. All available LED’s on the front panel will now blink continuously.
d. The machine is now in Calibration mode.
2. In Calibration Mode the machine will heat continuously until the tactile switch on the PCB is
pressed for a second time (NB: The tactile switch should be pressed for at least 1 second)
3. Using a thermometer to measure the temperature at the thermistor pocket, the machine
should be allowed to reach the desired set-temperature. (NB: It may be necessary to let the
unit cool down if the desired set point is lower than the units current temperature)
4. Following a correct calibration procedure the tank temperature should be maintained within
3°C of the desired set-point temperature.
In the event of an incorrect calibration process the steps below should be followed:
5. If the tactile switch is pressed too early and the temperature is set lower than desired, the
tester should simply repeat calibration.
6. If the tactile switch is pressed too late and the set temperature is too high, the tester will
need to wait for the temperature in the tank to cool, or add cool water, and then repeat
calibration.
3.4. TROUBLESHOOTING
The Ready/Status light signals various errors or problems.
A cycle of red flashes indicates an error. The number of flashes in a cycle corresponds to the
symptom in the table below:
Status/Diagnostic light guide:
No of
flashes
Symptom
Action required
2
Water level below elements. Normal
when machine first fills.
Check water pressure , if this is OK then call
service agent.
3
Temperature sensor failure (o/c)
Call service agent
4
Water not heating
Call service agent
5
Temperature sensor failure (s/c)
Call service agent
6
Machine not filling
Check water pressure. If OK – switch machine off
and on again. If problem reoccurs - call service
agent.
Note: Some of the error sequences will be displayed if there is low water
pressure. Please check that there is water pressure and that the water stop-
valve is open before calling your service agent.
3.5. MAINTENANCE:
Marco machines have been designed to give many years of trouble free service. Marco Beverage
Systems manufacture and test to ISO9002:2000 standard. The only regular maintenance required
is occasional de-scaling.