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TWO-STAGE GAS BURNERS: TROUBLE-SHOOTING GUIDE
DETAILS OF PROBLEM
POSSIBLE CAUSE
SOLUTION
The apparatus goes into “lock-out”
with the flame (red light on).Fault
restricted to flame control device.
1) Disturbance to ionization current from
ignition transformer.
2) Flame sensor (ionization probe) ineffi-
cient.
3) Flame sensor (ionization probe) position
incorrect.
4) Ionization probe or relative earth cable.
5) Electrical connection cut-off by flame
sensor.
6) Inefficient draught or fumes passage
blocked.
7) Flame disk or combustion heads dirty or
worn.
8) Equipment fault.
9) No ionization.
1) Invert the ignition transformer power supply
(230V side) and check using an analog micro-
ammeter.
2) Replace flame sensor.
3) Correct the position of the flame sensor, and
then check its efficiency by inserting the analog
micro-ammeter.
4) Check visually and using the instrument.
5) Restore the connection.
6) Ensure that the boiler fumes passage and
chimney connection are free.
7) Visually check and replace, if necessary.
8) Replace.
9) If the “earth” of the apparatus is not efficient, do
not check the ionization current. Check the effi
-
ciency of the “earth” at the terminal concerned
of the apparatus and at the “earth” connection
of the electric system.
The apparatus goes into “lock-out”,
gas flows out, but there is no flame
(red light on).Fault restricted to igni-
tion circuit.
1) Fault in ignition circuit.
2) Ignition transformer cable discharges to
earth.
3) Ignition transformer cable disconnected.
4) Ignition transformer faulty.
5) The distance between electrode and earth
is incorrect.
6) Isolator dirty, so electrode discharges to
earth.
1) Check the ignition transformer power supply
(230V) and high voltage circuit (electrode to
earth or isolator broken under locking termi-
nal).
2) Replace.
3) Connect.
4) Replace.
5) Position at the correct distance.
6) Clean or replace isolator and electrode.
The apparatus goes into “lock-out”,
gas flows out, but there is no flame
(red light on)
1) air/gas ratio incorrect.
2) Gas pipe has not been properly bled of air
(in the case of first ignition).
3) The gas pressure is insufficient or exces
-
sive.
4) Air flow between disk and head too nar
-
row.
1) Correct the air/gas ratio (there is probably too
much air or very little gas).
2) Bleed the gas pipe again, taking great care.
3) Check the maximum gas pressure value
at the
time of ignition
(use a water pressure gauge,
if possible).
4) Adjust the disk/head opening.
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