38
FAULTS/SUGGESTED REMEDIES
The control box supplied performs a diagnostic role by means of which it is possible to easily identify the possible causes of any malfunctions (signal:
RED LED
).
In order to use this function, it is necessary to wait at least ten seconds from the moment the control box is put in safety mode and press the lock-out reset
button for a minimum of three seconds.
Once the button has been released, the RED LED will start to flash, as illustrated in the diagram below.
The pulses of the LED constitute a signal spaced by approximately 3 seconds.
The number of pulses will provide the information on the possible faults, according to the table below.
RED LED on
wait at least 10 secs
Press button
for > 3 secs
Signal
Interval
3 secs
Signal
Signal
Problem
Possible cause
Suggested remedy
2 x blinks
Once the pre-purging phase
and safety time have passed,
the burner goes into lockout
without the appearance of the
flame
1
- The operation solenoid lets little gas through . . . . . . . . . Increase
2
- One of the two solenoid valves does not open. . . . . . . . Replace
3
- Gas pressure too low . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase pressure at governor
4
- Ignition electrode incorrectly adjusted. . . . . . . . . . . . . . . Adjust, see fig. (C) page 14
5
- Electrode grounded due to broken insulation . . . . . . . . . Replace
6
- High voltage cable defective . . . . . . . . . . . . . . . . . . . . . . Replace
7
- High voltage cable deformed by high temperature . . . . . Replace and protect
8
- Ignition transformer defective . . . . . . . . . . . . . . . . . . . . . Replace
9
- Incorrect valve or transformer electrical wiring . . . . . . . . Check
10 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
11 - A closed valve upline the gas train . . . . . . . . . . . . . . . . . Open
12 - Air in pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bleed air
13 - Gas valves unconnected or with interrupted coil. . . . . . . Check connections or replace coil
14 - Check the ceramic of the electrode unit is not damaged
Replace it
15 - Check there is no refractory material between the elec-
trodes, inside the combustion chamber . . . . . . . . . . . . .
Remove it
16 - Check there is no condensation inside the protection on
the electrode unit connections . . . . . . . . . . . . . . . . . . . .
Check the gaskets are undamaged and the screws
are well tightened
3 x blinks
The burner does not switch
on, and the lockout appears
17 - Air pressure switch in operating position. . . . . . . . . . . . . Adjust or replace
The burner starts and then
locks out
- Air pressure switch inoperative due to insufficient air
pressure:
18 - Air pressure switch incorrectly adjusted. Adjust it . . . . . . Adjust or replace
19 - Pressure switch pressure test point pipe blocked . . . . . . Clean
20 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
21 - High pressure in the furnace . . . . . . . . . . . . . . . . . . . . . . Connect air pressure switch to fan suction line
Lock-out during pre-purging
22 - Defective motor control contactor . . . . . . . . . . . . . . . . . .
(only three-phase version)
Replace
23 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . . . Replace
24 - Motor lockout (defective electrical motor) . . . . . . . . . . . . Replace
4 x blinks
The burner starts and then
locks out
25 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace the control box
Lock out when burner stops
26 - Permanent flame in the combustion head or flame
simulation
Eliminate persistence of flame or replace control box
6 blinks
The burner starts and then
locks out
27 - Defective or incorrectly adjusted servomotor . . . . . . . . . Adjust or replace
7 x blinks
The burner goes into lockout
at the 4th attempt, immedi-
ately following the appear-
ance of the flame
28 - The operation solenoid lets little gas through . . . . . . . . . Increase
29 - Ionisation probe incorrectly adjusted. . . . . . . . . . . . . . . . Adjust, see fig. (C) page 14
30 - Insufficient ionisation (less than 5 A). . . . . . . . . . . . . . . . Check probe position
31 - Earth probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
32 - Burner poorly grounded . . . . . . . . . . . . . . . . . . . . . . . . . Check grounding
33 - Phase and neutral connections inverted . . . . . . . . . . . . . Invert them
34 - Defective flame detection circuit . . . . . . . . . . . . . . . . . . . Replace control box
Burner locks out at the 4th
attempt when shifting from
minimum to maximum output
and vice versa
35 - Too much air or too little gas. . . . . . . . . . . . . . . . . . . . . . Adjust air and gas
When operating, the burner
goes into lockout at the 4
th
attempt.
36 - Probe or ionisation cable grounded . . . . . . . . . . . . . . . . Replace worn parts
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