LB-05053-03-GB
Pag. 23
03-04-13
5.
Safety valve operation.
Cause: overpressure in steam boiler
Result: the 1.7-1.9 bar safety valve opens and releases steam in the upper part of the machine.
Solution: carry out the following controls:
•
Triac earthed
•
Faulty temperature probe
6.
Anti-vacuum valve.
The "10" anti-vacuum valve (see hydraulic diagram) is installed on the boiler and prevents
any air remaining during the loading phase and a depression being created during the heating phase.
7.
Non-return valve.
The non-return valve (see hydraulic diagram) is installed between the loading solenoid valve and the boiler,
and has the following function:
•
During the loading phase it opens by means of the water pressure,
letting the water enter into the boiler.
•
Once the loading phase is over, it closes preventing the water
in the steam boiler from returning to the water supply network.
8.
Temperature probe alarm
The leds of the keys n°1 , 2 and 4 ,5 alternative flashing for each group , and the display shows:
First case: the temperature inside the boiler has reached the maximum value of 131°C
Effect: boiler heating is interrupted and drink keys are disabled.
Solution: swicth off the machine ( OFF ), check and if needed replace the “ triac”.
Second case: the temperature probe is defective and send a 0 Ohm (short circuit) signal to the pc board.
Effect: boiler heating is interrupted and drink keys are disabled.
Solution: switch off the machine ( OFF ), replace the temperature probe and switch on the machine.
Third case: the temperature probe is defective and send a 154 Ohm (open circuit) signal to the pc board.
Effect: boiler heating is interrupted and drink keys are disabled.
Solution: switch off the machine ( OFF ), replace the temperature probe and switch on the machine.
Attention: Periodically check the electric wiring of the TRIAC. A wrong or incomplete wiring may cause a pc board
breakage.
9.
Water filter alarm
Cause:
the flow meter has reached the maximum value of XXXX litres of previously programmed water, which may be dispensed.
Result: this alarm does not block dispensing, the led of the N° 1 , 2 and 3 keys will flash during the delivery.
Solution: renew the softener salts. To reset the alarm see the procedure in Info -Reset paragraph.