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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/flame 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 flame: inverted
phase and neutral
Verify correct neutral and phase con-
nection sequence
Ignition/flame detection electrode
wire is interrupted
Connect flame detection electrode
wire or replace it
Ignition/flame detection electrode is
faulty
Replace electrode
PCB does not detect flame, 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.
Flue gas thermostat has shut the
boiler down
Air intake or flue gas discharge system
is weak
Check air intake or flue gas discharge
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 turning
no. 5 knob to reset position.
The safety thermostat has shut boiler
down
CH water does not flow in the system:
pipes might be clogged, thermosta-
tic 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 flow temperature exceeded
85°C
Water flow in the system is not ade-
quate
Check the pump
Check CH system
No. 1 led is on in yellow.
The boiler will automatically resume
operation as soon as the malfunction
is corrected.
CH system water pressure is low
The system is leaking Check CH system
Water pressure switch is disconnected Reconnect it
Water pressure switch is not operating:
it is faulty
Replace it
No. 1 led is flashing yellow and red.
The boiler will automatically resume
operation as soon as the malfunction
is corrected.
CH flow is not working
CH probe is disconnected Reconnect it
CH probe is faulty Replace it
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