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TWO-STAGE GAS BURNERS: TROUBLE-SHOOTING GUIDE
DETAILS OF PROBLEM
The apparatus goes into "lock-out" with
the flame (red light on).
Fault restricted to flame control devi-
ce.
The apparatus goes into "lock-out", gas
flows out, but there is no flame (red light
on).Fault restricted to ignition circuit.
The apparatus goes into "lock-out",
gas flows out, but there is no flame
(red light on).
POSSIBLE CAUSE
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 ca-
ble.
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) Fault in ignition circuit.
2) Ignition transformer cable discharges to
earth.
3) Ignition transformer cable discon-
nected.
4) Ignition transformer faulty.
5) The distance between electrode and
earth is incorrect.
6) Isolator dirty, so electrode discharges to
earth.
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
excessive.
4) Air flow between disk and head too
narrow.
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0006081328_200808
SOLUTION
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 sen-
sor, and then check its efficiency by
inserting the analog micro-ammeter.
4) Check visually and using the instru-
ment.
5) Restore the connection.
6) Ensure that the boiler fumes passage
and chimney connection are free.
7) Visually check and replace, if neces-
sary.
8) Replace.
9) If the "earth" of the apparatus is not
efficient, do not check the ionization
current. Check the efficiency of the
"earth" at the terminal concerned
of the apparatus and at the "earth"
connection of the electric system.
1) Check the ignition transformer power
supply (230V) and high voltage circuit
(electrode to earth or isolator broken
under locking terminal).
2) Replace.
3) Connect.
4) Replace.
5) Position at the correct distance.
6) Clean or replace isolator and electro-
de.
1) Correct the air/gas ratio (there is pro-
bably 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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