“Engineer” Program Settings
TO BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN ONLY
Engineer Mode (cont.)
No prod, Stop Sel [Disabled]: No product, stop Selection. If enabled, when the coffee goes low during a dispense it will stop, giving a low measure. If disabled it will continue with the dispense even if the coffee goes low, then lock out once the dispense is finished.
Calibrate Temp: This is the calibration setting for the boiler thermistor.
Calibrate Disp Temp: This is the calibration setting for the dispense thermistor.
Display Heating ? [Enabled]: If enabled the machine will display ‘Heating’ if the dispense thermistor is reading below the lockout temperature. If disabled the temperature display goes blank when locked out, unless it is heating from initial turn on.
Water level Trip [50]: This adjusts the sensitivity of the water level sensor. The figure may need to be adjusted higher if the machine is being supplied by water with very little impurities (bottled water in exhibitions, for example).
View level Reading [Disabled]: This is enabled when setting the water level trip point – always disable once trip point is set.
Temp display source [Disp]: Used when calibrating the boiler thermistors, options are GM thermistor (boiler), dis- pense thermistor, or both together. Always select Dispense thermistor once calibrated.
Once you have scrolled through all these options, the machine will revert back to Setup mode.
Machine Fault Codes
1: Overflow
The Inlet valves may be blocked open. The overflow float may have failed, connections from the overflow float to the PCB may have failed.
2: Water sensor fail
The water sensor thinks the boiler is empty but the overflow float is up. Connections from the sensor to the PCB may have failed. The sensor loom may be disconnected from the Control PCB.
3: Thermostat overheat
The limit thermostat has tripped. This currently isn’t being monitored by the control logic.
4: Lack of Water - Insufficient water during normal operation.
If the inlet valves have been on for over a minute since the last call for water then it assumes insufficient water. There may not be sufficient water pressure to flow past the valves. The water supply may have been turned off. There may be a blockage in the inlet pipe either before or after the inlet valves. Connections from the inlet valves to the PCB may have failed. The inlet valve loom may be disconnected from the Control PCB. Inlet valve may be blocked or failed closed.
5: Lack of water #1 - Insufficient water from initial fill.
If inlet valves have been on for 8 minutes from the time the machine is turned on then it assumes insufficient water to fill the tank. Possible causes have been outlined above.
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