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SIGNAL
2 pulses
Once the pre-purging
phase and safety time
have passed, the burner
goes into lockout without
the appearance of the
flame
3 flashes
The burner does not
switch on, and the lockout
appears
The burner switches on,
but then stops in lockout
Lockout during pre-purg-
ing phase
4 flashes
The burner switches on,
but then stops in lockout
Lockout when burner
stops
7 flashes
The burner goes into lock-
out immediately following
the appearance of the
flame
Lockout of burner upon
transit between 1° and
2° stage, or between 2°
and 1° stage
Burner goes into lockout
during operation
10 pulses
The burner does not
switch on, and the lockout
appears
The burner goes into lock-
out
No led pulse
The burner does not start 36 - No electrical power supply. . . . . . . . . . . . . . . . . . . . . . . . . . Close all switches - Check connections
The burner continues to
repeat the start-up cycle,
without lockout
Ignition with pulsation
The burner does not
move into the 2° stage
Burner stops with air
damper open
FAULT
PROBABLE CAUSE
1
- The train lets a small quantity of gas through.. . . . . . . . . . Check the adjustment on the Multibloc
2
- The train does not open. . . . . . . . . . . . . . . . . . . . . . . . . . . Substitute the coil
3
- Gas pressure too low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check the adjustment on the Multibloc
4
- Ignition electrode badly adjusted. . . . . . . . . . . . . . . . . . . . . Adjust it see Fig. (C)page 14
5
- Electrode grounded due to broken insulation . . . . . . . . . . . Replace
6
- Faulty high voltage cable. . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
7
- High voltage cable deformed by high temperature . . . . . . . Replace and protect
8
- Ignition transformer defective. . . . . . . . . . . . . . . . . . . . . . . . Replace it
9
- Wrong electrical wirings of valves or transformer.. . . . . . . . Check them
10 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
11 - A closed valve up-line from the gas train. . . . . . . . . . . . . . Open it
12 - Air in pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bleed air
13 - Trains not connected, or with coil blocked.. . . . . . . . . . . . . . . . .Check connections or replace coil
14 - Air pressure switch in operating position . . . . . . . . . . . . . . Adjust or replace
Air pressure switch inoperative due to
insufficient air pressure:
15 - Air pressure switch adjusted badly. . . . . . . . . . . . . . . . . . . . Adjust or replace
16 - Pressure switch pressure point pipe blocked. . . . . . . . . . . . Clean
17 - Head wrongly adjusted.. . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
18 - High depression in the furnace. . . . . . . . . . . . . . . . . . . . . . Connect air pressure switch to fan suction line
19 - Faulty motor command contactor . . . . . . . . . . . . . . . . . . . . . Replace it
20 - Defective electrical motor. . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
21 - Motor lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Release thermal cutout on three-phase return
22 - Permanent flame in the combustion head or . . . . . . . . . . .
simulation of flame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Eliminate permanency of flame
23 - Permanent flame in the combustion head or . . . . . . . . . . .
simulation of flame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Eliminate permanency of flame
24 - The train lets a small quantity of gas through.. . . . . . . . . . Check the adjustment on the Multibloc
25 - Ionisation probe poorly adjusted. . . . . . . . . . . . . . . . . . . . . Adjust it, see Fig. (C)page 14
26 - Insufficient ionisation (lower than 5 A). . . . . . . . . . . . . . . . Check probe position
27 - Probe grounded. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
28 - Insufficient earthing of the burner. . . . . . . . . . . . . . . . . . . . . Correct the earthing
29 - Phase and neutral connections inverted. . . . . . . . . . . . . . . Invert them
30 - Too much air or too little gas. . . . . . . . . . . . . . . . . . . . . . . . Adjust air and gas
31 - Probe or ionisation cable grounded. . . . . . . . . . . . . . . . . . Replace worn parts
32 - Fault on air pressure switch. . . . . . . . . . . . . . . . . . . . . . . . . Replace
33 - Erroneous electrical connections. . . . . . . . . . . . . . . . . . . . . Check connections
34 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
35 - Presence of electromagnetic disturbance . . . . . . . . . . . . . . Use the radio disturbance protection kit
37 - A thermostat/limit or safety pressure switch is open. . . . . . Adjust it, or replace it
38 - Line fuse blocked. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
39 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
40 - No gas supply.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open the manual valves between meter and
41 - Mains gas pressure insufficient. . . . . . . . . . . . . . . . . . . . . . Contact your GAS COMPANY
42 - Minimum gas pressure switch fails to close. . . . . . . . . . . . . Adjust or replace
43 - Servomotor does not move into St1 position. . . . . . . . . . . . Replace it
44 - Mains gas pressure is near the value . . . . . . . . . . . . . . . . . Reduce operating pressure
on which the min. gas pressure switch gas is adjusted.
The repeated drop in pressure which follows valve
opening causes temporary opening of the pressure
switch itself, the valve immediately closes and the
burner comes to a halt.
Pressure increases again, the pressure switch closes
again and the firing cycle is repeated.
The sequence repeats endlessly.
45 - Head poorly adjusted. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust it (see page 16)
46 - Ignition electrode badly adjusted. . . . . . . . . . . . . . . . . . . . . Adjust it, see Fig. (C)page 14
47 - Poorly adjusted fan air gate: too much air. . . . . . . . . . . . . . Adjust
48 - Output during ignition phase is too high.. . . . . . . . . . . . . . . Reduce
49 - Thermostat/TR pressure switch does not close. . . . . . . . . . Adjust it or replace it
50 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
51 - Faulty servomotor.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
52 - Faulty servomotor.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace it
40
SUGGESTED REMEDY
line
train
of minimum gas pressure switch
Replace gas filter.
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