Ferroli PEGASUS D Ki 100, Instructions For Use Manual, Page: 21 / 204

PEGASUS D Ki 100
21
EN
cod. 3540L870 - 03/2009 (Rev. 00)
3.4 Troubleshooting
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler anomaly, the display will flash to-
gether 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, 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 ”) that cause temporary shutdowns are automatically reset as soon as the value
returns within the boiler's normal working range.
Table. 2 - Fault list
Fault
code
Fault Possible cause Cure
A01 Burner fails to light
No gas
Check the regular gas flow to the boiler and that the
air has been eliminated from the pipes
Ignition/detection electrode fault
Check the wiring of the electrode and that it is cor-
rectly positioned and free of any deposits
Faulty gas valve Check the gas valve and replace it if necessary
Ignition power too low Adjust the ignition power
A02
Flame present signal with
burner off
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
A03
Overtemperature protection
activation
Heating sensor damaged
Check the correct positioning and operation of the
heating sensor
No water circulation in system Check the circulating pump
Air in the system Vent the system
F04
Fume thermostat activation
(after the fume thermostat
activation, boiler operation is
prevented for 20 minutes)
Fume thermostat contact open Check the thermostat
Wiring disconnected Check the wiring
Flue not correctly sized or
obstructed
Replace the flue
A06
No flame after the ignition
stage
Low pressure in gas system Check the gas pressure
Burner minimum pressure set-
ting Check the pressures
F10 Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F11 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F14 Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F34 Supply voltage under 170V. Electric mains trouble Check the electrical system
F35 Mains frequency fault Electric mains trouble Check the electrical system
F37
Incorrect system water pres-
sure
System empty Fill the system
Water pressure switch not con-
nected or damaged
Check the sensor
F39 External probe fault
Probe damaged or wiring
shorted
Check the wiring or replace the sensor
Sensor disconnected after acti-
vating sliding temperature Reconnect the external probe or disable the sliding
temperature