GRADISCA Restyling rev.1 - 06/2004
27
Problem: The boiler is under pressure but the group does not heat up
- Cause 1:
air bleeding of the boiler did not occur during the water heating stage.
Cures:
When cold check that the air vacuum valve is not blocked shut. Replace if necessary.
- Cause 2:
the water heating circuit is partially obstructed (except lever machine)
Cures:
check the group’s inlet and outlet pipes and unions. Clean and replace if necessary.
N.B. check the regeneration of the softener resins
Problem: The boiler will not heat up
- Cause 1:
the heating element is broken
Cures:
replace
- Cause 2:
the heating element is not receiving power
Cures :
- the safety thermostat is faulty; check and replace if necessary
- the pressure switch is faulty; check and replace if necessary
- the main switch is faulty; check and replace if necessary.
Problem: The water level control provides water when it should not and the level gauge light is on
- Cause 1:
the level sensor/control centre electrical connection is broken
Cures:
repair
- Cause 2:
the frame earthing/control centre electrical connection is broken
Cures:
repair
- Cause 3:
the level sensor is dirty
Cures:
clean; when dismantling do not unthread it from the insulator but remove it complete with the union.
- Cause 4:
the electronic control centre is defective
Cures:
replace
Problem: The water level control does not provide water when it should and the level gauge light is off
- Cause 1:
the sensor is touching the glass or earthed metal parts
Cures:
check and reposition
- Cause 2:
the electronic control centre is defective
Cures:
check and replace if necessary
Problem: The water level control does not provide water when it should and the level gauge light is on
- Cause 1:
the loading solenoid valve coil is broken
Cures:
check and replace if necessary
- Cause 2:
the loading solenoid valve core is blocked
Cures:
check and replace if necessary
Problem: The water level in the boiler continues to rise until it escapes from the safety valve
- Cause 1:
level sensor not connected
Cures:
verify and replace if necessary
- Cause 2:
there is a foreign body inside the water level control solenoid valve
Cures:
check and replace if necessary
- Cause 3:
there is a foreign body in the seal housing
Cures:
check
- Cause 4:
the seal is worn
Cures:
check and replace if necessary
Problem: The graduated optical gauge does not show the actual water level in the boiler
- Cause 1:
the gauge’s lower connection pipe with the boiler is obstructed
Cures:
dismantle and clean
Problem: The boiler gets up to pressure but the group will not deliver
- Cause 1:
the control centre fuses are shot (dosed version)
Cures:
check and replace if necessary
- Cause 2:
the delivery switch is defective (continuous delivery version)
Cures:
check and replace if necessary
- Cause 3:
the solenoid valve will not open
Cures:
check and replace if necessary
Problem: The machine will only deliver when the heating element is electrically powered (red indicator light on)
- Cause 1:
“neutral” is missing from the electrical power supply
Cures:
check and reset
Problem: Irregular doses are delivered (dosed version only)
- Cause 1:
there is a leakage in the infra-red doser
Cures:
replace the doser if there is humidity on its outside and on the diode holder flange
- Cause 2:
the doser’s rotor does not turn freely
