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If, after correctly having performed the ignition operations, the burners do not ignite and the
shut-down warning light is on, wait around 15 seconds and then turn knob "A" (Fig. 1) to the RESET
position and release it. The control unit will be reset and will repeat the ignition cycle. If, after a number
of attempts, the burners do not ignite, refer to the paragraph "Troubleshooting".
In the case of power failures while the boiler is in operation, the burners will switch off. When
mains power returns, the burners will automatically re-ignite.
Checks during operation
• Check the gas supply and the water system for tightness.
• Check the efficiency of the flues and air-flue gas pipes during the operation of the boiler.
• Check that the water circulation between the boiler and the systems is correct.
• Ensure that the gas valve modulates correctly both in the central heating phase and the
production of domestic hot water.
• Check the correct ignition of the boiler, by performing a series of ignition and shut-down tests using
the room thermostat or the remote control.
• Ensure that the consumption of gas indicated by the counter corresponds to the values shown
in the technical data table in Chap. 4.
Shut-down
C
lose the gas isolation valve upstream of the boiler and disconnect the appliance from the
mains power supply.
For extended periods of inactivity during the winter months, in order to avoid damage due to
freezing, all the water should be drained from the boiler, both the domestic hot water and the
central heating system; alternatively, drain only the domestic hot water and place the special
antifreeze fluid in the central heating system.
3.3 Maintenance
The following operations must only be performed by Qualified Personnel
easonal checks on the boiler and the stack
S
T
he following checks should be made on the appliance at least once a year:
• The control and safety devices (gas valve, flow-meter, thermostats, etc.) must be working properly.
• The pipes and the air-flue gas terminals must be free of obstacles and not have any leaks.
• The water systems must be perfectly tight and the gas supply sound.
• The burner and the heat exchanger must be clean. Follow the instructions in the next paragraph.
• The electrodes must be free of deposits and positioned correctly.
• The pressure of the water in the system when cold must be around 1 bar; if not, restore this value.
• The expansion vessel must be full.
• The gas rate and the pressure must correspond to the values indicated in the corresponding tables.
• The circulation pumps must not be blocked.
22
SYS 10-23
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