PROBLEM SOLVING
Mirage technical manual
page 56 of 65
Failure characteristics
Although little problems are known with the controller, a few observations have been reported:
1. The display of the controller does not light up.
a
The machine does not get power (mains switch in position "0" or problems with electrical
mains):
Check: when the machine does get power, the groups will work and the pump may run.
b
The temperature controller does not get power:
Fuse in Gicar controller blew out.
Check: replace fuse in Gicar (3.15 Amp).
Water level in the steam boiler is below safety level.
Check: pull the connector (on the orange wire) from the safety level sensor and make
electrical contact to the machine; push bare metal of connector against boiler. After a few
seconds, the controller will get power if water is indeed below safety level. If so, check fill-
up of steam boiler.
c
Temperature controller is malfunctioning:
Replace controller.
2. The display shows
or
.
a
means that measured resistance value is outside (higher than) sensor-range. It normally
means that the circuit is open.
Check if all connections between controller and sensor are OK.
b
means that the measured resistance is outside (lower than) sensor-range. It normally
means a short circuit.
Check for a short in the connections.
Exchange sensor when resistance of sensor is lower than about 90 Ohm (room
temperature).
3. The display shows incorrect (too high) or erratic (quickly changing) temperature value.
a
Bad electrical connection of sensor on controller:
Check: pull connectors from sensor, squeeze faston connectors a little tighter, remount
on sensor.
Check: remount sensor cable leads on controller.
b
Controller malfunction:
Replace controller.
4. Pressing the buttons of the controller has no effect.
a
Printed circuit board (PCB) inside the controller has shifted w.r.t. its casing, or switch on the
PCB has bent out of reach of the push button.
Check if PCB can be shifted back, otherwise replace controller.