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6. TROUBLESHOOTING
BOILER STATUS
MALFUNCTION
PROBABLE CAUSE
SOLUTION
The boiler has shut down, and
red light 5 is flashing.
Turn selector 9 to RESET
position to resume boiler
operation
The burner does not ignite
Gas supply failure
Check gas pressure
Check mains gas safety valve
Gas valve has disconnected
Reconnect gas valve
Gas valve is faulty
Replace it
PCB is faulty
Replace it
Burner does not ignite
Spark electrode is faulty
Replace it
Ignition transformer is faulty
Replace ignition transformer
PCB is faulty
Replace PCB
Burner ignites for a few secon-
ds and then goes off
PCB does not detect flame:
inverted phase and neutral
Verify correct neutral and
phase connections
Flame detection electrode
wire is disconnected or faulty
Connect flame detection
electrode wire or replace it
Detection electrode is faulty
Replace electrode
PCB does not detect flame
Replace PCB
P ACC ignition value set point
is too low
Adjust P ACC ignition value
set point
Min heat input is not set
correctly
Check burner adjustment
The boiler has shut down and
red light 4 is flashing.
Turn selector 9 to RESET
position to resume boiler
operation
Flue pressure switch not ope-
rating (model TFS only)
Flue pressure switch is faulty
Check flue pressure switch
and replace if necessary
Silicone pipes are discon-
nected or faulty
Reconnect or replace silicone
pipes
Insufficient air intake or flue
gas discharge
Check air/flue gas pipes:un-
clog or replace as required
Fan is faulty
Replace it
PCB is faulty
Replace it
Flue thermostat has shut boi-
ler down (model TN)
Air / flue chimney system is
clogged
Check flue gas exhaust and
air intake vent grilles in the
boiler room
Flue gas thermostat is faulty
Replace it
The boiler has shut down and
red light 3 is flashing.
Turn selector 9 to RESET
position to resume boiler
operation
Boiler safety thermostat has
shut boiler down
CH water does not flow: pipes
may be clogged, thermostatic
valves may be shut, system
stopcocks may be closed
Check CH system
Pump is stuck or faulty
Check the pump
The boiler has shut down and
red light 6 is flashing.
Reset boiler by restoring cor-
rect water pressure
Insufficient water pressure
Possible water leaks
Check system for leaks
Pressure switch is discon-
nected
Reconnect it
Water pressure switch is faulty Replace it
The boiler has shut down, red
light 2 and yellow light 8 are
flashing.
Boiler will automatically
resume operation when the
problem has been solved
CH probe is not operational
CH probe is disconnected
Reconnect it
CH probe is faulty
Replace it
