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PEGASUS 56
Pilot burner assembly
3
5
8
1
Combustion chamber door
2
Inspection door
3
Pilot burner
4
Ignition electrode
5
Detection electrode
6
Pilot nozzle
7
High voltage cable
8
Gas supply pipe
3 ÷ 4 mm
4
fig. 8 - Pilot burner
cod. 3540S424 - Rev. 00 - 10/2020
4.4 Troubleshooting
Table. 1 - List of faults
Fault
Cause
Pilot burner nozzle dirty
Air in the gas pipes
After a few lighting attempts the
No discharge between electrodes
electronic controller puts the
boiler in shutdown status
Faulty gas valve
Electric mains trouble
Electric mains trouble
Wiring fault
The boiler does not start
No gas
Fume thermostat cut in
Room thermostat open
Gas pressure too low
Gas nozzles dirty or wrong
The burner burns poorly:
flames too high, too low or too yel-
Insufficient air change
low
Boiler dirty
Insufficient flue draught
Smell of unburnt gas
Incorrect (excess) flame adjustment
Incorrect thermostat setting
Wrong flame setting
Boiler dirty
The boiler works but the tempera-
ture fails to increase
Boiler insufficient
No water circulation in the system
Incorrect thermostat setting
Temperature of water towards the
system too high
Incorrect thermostat positioning
Excess gas
Boiler dirty
Explosion at burner
Ignition delays
Burner dirty
Wrong nozzles
Incorrect thermostat setting
The boiler produces condensation
water
Insufficient gas consumption
Fume thermostat cut in
The boiler shuts down for no
apparent reason
Cure
Clean the nozzle with compressed
air
Check the regular flow of gas to the
boiler and that the air has been elim-
inated from the pipes
Make sure the electrodes are cor-
rectly positioned, intact, free of
deposits and that the spark is regu-
lar (see fig. 53)
Check the electrical connections at
the ignition and ionisation electrodes
Replace the valve
Make sure the boiler is connected to
the mains rated voltage and to an
efficient earth connection
Make sure PHASE-NEUTRAL are
not inverted and that the earth con-
tacts are efficient
Check the connections at the elec-
tronic flame controller
Check the inlet gas pressure and
any open pressure switches
Reset the fume thermostat
Make sure the room thermostat is
closed in call
Check the gas supply pressure
Check the nozzles and clean if nec-
essary
Make sure the ventilation in the
room where the unit is located is suf-
ficient for proper combustion
Check and clean the boiler shell
Check flue draught efficiency
Make sure gas consumption is not
excessive (gas pressure switch noz-
zles or diameter)
Check correct operation of the con-
trol thermostat
Check that gas consumption is not
less than that provided for
Make sure that the boiler is perfectly
clean
Make sure the boiler is adequate for
the system
Make sure the heating pump is not
blocked and that the water circuit is
not dirty
Check operation of the control ther-
mostat
Check the bulb position
Check the main burner gas pressure
Check and clean the boiler shell
Check and clean the burner
Check the nozzles
Make sure the boiler is not operating
at too low temperatures (below
40°C)
Check that gas consumption is regu-
lar
Check for any obstructions in the
flue and manually reset the fume
thermostat
33
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