32
6. TROUBLESHOOTING
BOILER STATUS MALFUNCTION PROBABLE CAUSE SOLUTION
The boiler has shut down, and no. 2
led is on in red.
Turn no. 5 knob to reset position in
order to resume boiler operation.
Burner does not ignite
Gas supply failure
Check gas pressure
Check gas network stopcock or gas
network safety valve intervention
Gas valve has disconnected Reconnect it
Gas valve is faulty Replace it
PCB is faulty Replace it
Burner does not ignite: there is no
spark
Ignition/ame sensing electrode is
faulty
Replace the electrode
PCB does not ignite: it is faulty Replace PCB
Burner ignites for a few seconds
and goes off
PCB does not detect ame: inver-
ted phase and neutral
Verify correct neutral and phase
connection sequence
Ignition/ame detection electrode
wire is interrupted
Connect ame detection electrode
wire or replace it
Ignition/ame detection electrode
is faulty
Replace electrode
PCB does not detect ame, it is
faulty
Replace PCB
Ignition heat input setting is too low Increase it
Minimum heat input in not set
correctly
Check burner setting
The boiler has shut down and no. 1
led is on in yellow.
Turn no. 5 knob to reset position in
order to resume boiler operation.
Air intake/ue gas exhaust pressure
switch is not operating (CTFS)
Air intake/ue gas exhaust pressure
switch is faulty
Check Air intake/ue gas pressure
switch: replace it if faulty
The silicone pipes of switch are
disconnected or damaged
Connect or replace silicone pipes
Air intake or ue gas discharge ow
is nor correct
Check air intake or ue gas
discharge
Fan is faulty Replace it
PCB is faulty Replace it
Flue gas thermostat has shut the
boiler down ( CTN )
Air intake or ue gas discharge
system is weak
Check air intake or ue gas dischar-
ge system and vent grilles in the
boiler room
Flue gas thermostat is faulty Replace it
The boiler has shut down and no. 1
led is on in red.
The boiler will automatically resume
operation after 10 seconds or tur-
ning no. 5 knob to reset position.
The safety thermostat has shut
boiler down
CH water does not ow in the
system: pipes might be clogged,
thermostatic valves might have
shut, system stopcocks might be
closed
Check CH system
Pump is blocked or faulty Check the pump
No. 1 led is on in red.
The boiler will resume operation
as soon as the malfunction is
corrected.
CH water ow temperature excee-
ded 85°C
Water ow in the system is not
adequate
Check the pump
Check CH system
No. 1 led is on in yellow.
The boiler will automatically resume
operation as soon as the malfunc-
tion is corrected.
CH system water pressure is low
The system is leaking Check CH system
Water pressure switch is discon-
nected
Reconnect it
Water pressure switch is not opera-
ting: it is faulty
Replace it
No. 1 led is ashing yellow and red.
The boiler will automatically resume
operation as soon as the malfunc-
tion is corrected.
CH ow is not working
CH probe is disconnected Reconnect it
CH probe is faulty Replace it
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