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Positioning of combs
After cleaning the recovery unit make sure the combs are positioned correctly, as shown
in fig. 37. Tighten the nuts on the compressor disk "A" respecting the torque setting of
0.6 Nm. If a torque wrench is unavailable, check that there is a fume passage of 1 mm
between the coils.
60°
60°
60°
fig. 37 - Positioning of combs
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, press the RESET button (detail 8 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to restart, it is necessary to elim-
inate the fault indicated by the operation LEDs.
Faults marked with the letter "F" cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.
48
EN
60°
60°
60°
cod. 3541B625 - Rev. 03 - 03/2015
ATLAS D CONDENS UNIT
Table. 6 - List of faults
Fault
Fault
Possible cause
code
Pump blocked
Faulty electric motor
Faulty oil valve
No fuel in tank, or water on bottom
Oil line supply valves closed
Dirty filters (line-pump-nozzle)
Pump unprimed
Ignition electrodes not properly adjusted,
or dirty
Nozzle clogged, dirty or deformed
A01
Burner block
Unsuitable head and shutter adjustments Adjust
Faulty electrodes or earthed
Faulty ignition transformer
Faulty electrode wires or earthed
Electrode wires deformed by high tem-
perature
Faulty valve or transformer electrical con-
nections
Broken pump-motor joint
Pump inlet connected to return pipe
Faulty photoresistance
Dirty photoresistance
Photoresistance short circuit
Flame present signal
A02
Extraneous light strikes the photoresist-
with burner off
ance
Heating sensor damaged
Overtemperature pro-
A03
tection activation
No water circulation in the system
Air in the system
A04
Card parameter fault
Wrong card parameter setting
Preheater fault (the
Preheater fault
F07
contact fails to close
Wiring disconnected
within 120 seconds)
F09
Card parameter fault
Wrong card parameter setting
Sensor damaged
F10
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Sensor damaged
F11
DHW sensor fault
Wiring shorted
Wiring disconnected
F12
Card parameter fault
Wrong card parameter setting
Sensor damaged
F14
Delivery sensor 2 fault
Wiring shorted
Wiring disconnected
F16
Card parameter fault
Wrong card parameter setting
Supply voltage under
F34
Electric mains trouble
170V.
Faulty mains fre-
F35
Electric mains trouble
quency
Pressure too low
Incorrect system water
F37
pressure
Sensor damaged
Probe damaged or wiring shorted
F39
External probe fault
Probe disconnected after activating the
sliding temperature
Incorrect system water
F40
Pressure too high
pressure
A41
Sensor positioning
Delivery sensor not inserted in boiler shell
F42
Heating sensor fault
Sensor damaged
System water pressure
F47
Wiring disconnected
sensor fault
Cure
Replace
Replace
Replace
Refill with fuel or suck the water
Open
Clean
Prime and find the cause of
unpriming
Adjust or clean them
Replace
Replace
Replace
Replace
Replace and protect
Check
Replace
Correct the connection
Replace
Clean the photoresistance
Replace photoresistance
Eliminate the light source
Check the correct positioning and
operation of the heating sensor
Check the circulating pump
Vent the system
Check the card parameter and
modify it if necessary
Check the preheater
Check the wiring
Check the card parameter and
modify it if necessary
Check the wiring or replace the
sensor
Check the wiring or replace the
sensor
Check the card parameter and
modify it if necessary
Check the wiring or replace the
sensor
Check the card parameter and
modify it if necessary
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the wiring or replace 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
Replace the sensor
Check the wiring
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