7 TROUBLE-SHOOTING
UNIT STATUS
MALFUNCTION
POSSIBLE CAUSE
SOLUTIONS
The boiler is blocked, the red
blockage light 1 is illuminated.
See paragraph
4.10. “Burner diagnostic”.
See paragraph
4.10. “Burner trouble-shooting”.
See paragraph
4.10. “Burner trouble-shooting”.
The boiler has shut down and
red light no. 2 is on.
Reset by pressing no. 17 button.
Safety thermostat has shut the
boiler down
Water is not flowing in the CH
system: pipes are clogged,
thermostatic valves are closed,
intercepting valves in the system
are closed
Check CH system
Pump is blocked or faulty
Check the pump
The boiler has shut down and
red light no. 4 is flashing.
Restore correct water pressure
Insufficient water pressure
Possible water leaks
Check system for leaks
Pressure switch is disconnected Reconnect it
Water pressure switch is faulty
Replace it
The boiler has shut down, red
light no. 5 is flashing.
Boiler will automatically resume
operation as soon as the
problem is solved
Flow probe is faulty
Flow probe is disconnected
Replace it
Flow probe is faulty
Replace it
The boiler has shut down and
red light no. 6 is flashing.
Boiler will automatically resume
operation as soon as the pro-
blem is solved
Boiler communication to and
from remote control is faulty
Connecting wire is faulty
Check connecting wire
The boiler has shut down, red
light no. 7 is flashing.
Boiler will automatically resume
operation as soon as the pro-
blem is solved
Water tank is faulty
Water tank probe is discon-
nected
Reconnect it
Water tank probe is faulty
Replace it
The boiler has shut down, red
light no. 9 is flashing (BTN
model only).
Reset by pressing no. 19 button.
Flue gas thermostat is not
consenting to boiler operation
Flue gas thermostat is faulty
Check flue gas thermostat ope-
ration: replace when faulty
Air inlet or flue gas discharge
flow is not adequate
Replace it
Boiler is not supplying DHW
Flow meter is not operating
The system has not sufficient
pressure or flow rate
Check DHW system
Check flow meter filter
Flow meter sensor is faulty or
disconnected
Replace or reconnect it
Flow meter is blocked
Replace it
20
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