7
User’s operating instructions
Cause:
Insufficient water pressure in the central heating system.
Elimination of the fault:
Restore the correct pressure value by regulating the boiler’s
filling valve (for correct boiler operation the pressure should
be between 0,8 and 1 bar).
When the correct pressure value has been reached the led
will switch off automatically and normal boiler operation will
be restored.
DANGER!
If the system has to be frequently restored
please contact an authorized Unical After
Sales Service Centre.
6.5 - ELIMINATING THE FAULTS
If the boiler goes into lock-out the user can reset the boiler
only in the following cases:
Lock-out led illuminated and flashing
WARNING:
If the boiler goes into lock-out and/or the leds
continue to flash repeatedly or remain illumi-
nated do not try to reset the boiler yourself.
Contact your nearest Unical authorized Af-
ters Sales Service Centre.
Burner lock-out led constantly illuminated
Cause:
IThe burner’s lock-out device has intervened due to:
- no gas supply (in this case check that the gas service cock
is open
- presence of air in the piping (if it is a new system or after a
long inactivity of the boiler).
Elimination of the fault:
Check that the gas service cock is in the On position and that
the air present in the piping has been vented.
Press the reset key to restore correct boiler operation.
If the cut-off device operates repeatedly (a
maximum of 3 times), causing boiler shu-
tdown, do not try to relight the boiler your-
self. Contact your nearest Unical authorized
After Sales Service Centre.
Filling cock
