Troubleshooting - Ferroli PEGASUS D LN Instructions For Use, Installation And Maintenance

PEGASUS D LN
Burner assembly removal and cleaning
To remove the burner assembly:
• Disconnect the power and turn off the gas ahead of the boiler.
• Electrically disconnect the pilot burner assembly and gas valve.
• Undo the nut "A" fixing the gas feed pipe ahead of the gas valve.
• Undo the two nuts "B" fixing the combustion chamber door to the cast iron elements
of the boiler (fig. 21).
• Remove the burner assembly and combustion chamber door.
Then check and clean the main burners and pilot burner.
Only use a non-metallic brush or compressed air to clean the burners; never
A
use chemical products.
During cleaning operations take care not to damage the insulation of the com-
A
bustion chamber door "C".
A
C
fig. 21 - Removing the burners
Pilot burner assembly
3
5
8
fig. 22 - Pilot burner
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
B
B
3 ÷ 4 mm
4
cod. 3540U017 - Rev. 02 - 02/2015

4.4 Troubleshooting

Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault,
the display will flash together with the fault symbol (detail 22 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation just press the RESET button (detail 8 - fig. 1) for 1 second or RESET on the
optional remote timer control if installed; if the boiler fails to start, it is necessary to firstly
eliminate the fault.
Other faults (marked with the letter "F") cause temporary shutdowns that are automati-
cally reset as soon as the value returns within the boiler's normal working range.
Table. 2 - List of faults
Code
Fault Possible cause
fault
No gas
Detection/ignition electrode
A01 No burner ignition
fault
Defective gas valve
Ignition power too low
Electrode fault
Flame present signal
A02
with burner off
Card trouble
Heating sensor damaged
Over-temperature pro-
toA03 No water circulation in the
tection trips
system
Air in the system
Fume thermostat contact
Fume thermostat acti-
open
vated (after activation of
F04 the fume thermostat, Wiring disconnected
boiler operation is pre-
Flue not correctly sized or
vented for 20 minutes)
obstructed
Low pressure in the gas sys-
tem
No flame after the igni-
A06
tion phase
Burner minimum pressure
setting
Sensor damaged
F10 Delivery 1 sensor fault Wiring shorted
Wiring disconnected
Sensor damaged
F14 Delivery 2 sensor fault Wiring shorted
Wiring disconnected
Supply voltage under
F34 Electric mains trouble
170V.
Irregular mains fre-
F35 Electric mains trouble
quency
System empty
Incorrect system water
F37
Water pressure switch not
pressure
connected or damaged
Probe damaged or wiring
shorted
F39 External sensor fault
Sensor disconnected after
activating the sliding tem-
perature
Incorrect system water
F40 Pressure too high
pressure
Delivery sensor discon-
A41 Sensor positioning
nected from the pipe
F42 Heating sensor fault Sensor damaged
System water pressure
F47 Wiring disconnected
sensor fault
Gas valve wiring fault
A48 Gas valve fault Defective gas valve
Card trouble
Gas valve wiring fault
A49 Gas valve fault Defective gas valve
Card trouble
Recommended cure
Check the regular gas flow to the boiler and
that the air has been eliminated from the
pipes
Check the wiring of the electrode and that it is
correctly positioned and free of any deposits
Check the gas valve and replace it if neces-
sary
Adjust the ignition power
Check the ionisation electrode wiring
Check the card
Check the correct positioning and operation
of the heating sensor
Check the circulator
Vent the system
Check the thermostat
Check the wiring
Replace the flue
Check the gas pressure
Check the pressures
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the wiring or change the sensor
Reconnect the external probe or disable the
sliding temperature
Check the system
Check the safety valve
Check the expansion tank
Check the correct positioning and operation
of the heating sensor
Change the sensor
Check the wiring
Check the wiring
Replace the gas valve
Replace the card
Check the wiring
Replace the gas valve
Replace the card
33
EN