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5.15 Lockout types
Whenever a lockout occurs, the control box shows the reasons
for the fault (and the reasons can be identified by the reset button
colour).
Lockout description
Presence of parasite flame during
stand-by or the post-purging
Detection of parasite flame during
pre-purging
The flame is not detected after the
safety time
Flame failure during operation
Fan motor error
Fault with the internal control of the
1st stage gas valve
Eeprom error
Lockout due to air pressure switch
not closing after a heat request or af-
ter a recycle due to flame loss during
operation
Lockout for loss of air pressure or af-
ter repetition of the pre-purging due
to loss of air, or 10 sec before the end
of the pre-purging, or during the safe-
ty time, or during normal operation
Lockout due to air pressure switch al-
ready switched to closing of the heat
request thermostat or after a recycle
due to flame loss during operation
Fault with the internal control circuit
of the 2nd stage gas valve
*
(
) For the blinking frequency of the reset button see paragraph
"Fault diagnostics - lockouts" on page 26.
To reset the control box after visual diagnostics
have been displayed, you must press the reset
button.
WARNING
In the event the burner stops, in order to prevent
any damage to the installation, do not unblock the
burner more than twice in a row. If the burner
locks out for a third time, contact the customer
WARNING
service.
In the event there are further lockouts or faults
with the burner, the maintenance interventions
must only be carried out by qualified, authorised
personnel, in accordance with the contents of this
DANGER
manual and in compliance with the standards and
regulations of current laws.
20135737
Installation
Lockout time
Led colour (
After 25 seconds
After 1 second
3 seconds after the
activation of the gas
valve
After 3 recycles
Immediate
Immediate
Immediate
After 15 seconds
After 1 second
After 120 seconds
Immediate
34
The sequence of pulses issued by the control box of the LED in
the reset button identifies the possible types of fault, which are
listed in the table below:
*
)
-
presence of a false flame after heat request or
during post-purging
-
presence of false flame signal during pre-purging
-
ionisation probe faulty or not connected
-
gas valve
-
faulty ignition transformer
-
badly regulated burner
-
burner not calibrated correctly
-
ionisation probe faulty
-
faulty fan motor
-
fan motor not connected
-
gas valve
-
internal control circuit of the 1st stage gas valve
faulty
-
faulty internal memory
-
the air pressure is too low, (the head has been
poorly adjusted)
-
The air pressure switch is defective: change it
-
the air pressure is too low, (the head has been
poorly adjusted)
-
the air pressure switch is defective: change it
-
the air pressure switch is changed over to the op-
erational position, change the pressure switch
-
the fan motor continues to be powered, check
the lockout of the flame control
-
internal control circuit of the 2nd stage gas valve
faulty
GB
Possible cause
Tab. Q
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