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Faults - Probable causes - Solutions
6
The control box has a self-diagnostic system, which easily allows identifying the operating faults (signal: RED LED).
To use this function, wait at least ten seconds from the safety lock out, and then press the reset button for a minimum of 3 sec-
onds.
After releasing the button, the RED LED starts flashing as shown in the diagram below.
RED LED on
press reset for 10s
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.
SIGNAL
2 x blinks
Once the pre-purging
phase and safety time
have passed, the
burner goes into lock-
out without the
appearance of the
flame
3 x blinks
The burner does not
switch on, and the
lockout appears
The burner switches
on, but then stops in
lockout
Lockout during pre-
purging phase
4 pulses
The burner switches
on, but then stops in
lockout
Lockout when burner
stops
6 x blinks
The burner switches
on, but then stops in
lockout
7 pulses
The burner goes into
lockout immediately
following the
appearance of the
flame
Burner locks out
when shifting from
minimum to maximum
output and vice versa
Burner goes into
lockout during
operation
All manuals and user guides at all-guides.com
Press button
for > 3s
FAULT
PROBABLE CAUSE
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 regulator
4 - Ignition electrode incorrectly adjusted . . . . . . . . . . . . Adjust, see Fig. 12
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 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 incorrectly adjusted . . . . . . . . . . . Adjust or replace
16 - Pressure switch pressure test point pipe blocked . . . Clean
17 - Head incorrectly adjusted. . . . . . . . . . . . . . . . . . . . . . Adjust
18 - High pressure in the furnace . . . . . . . . . . . . . . . . . . . Connect air pressure switch to fan suction
19 - Defective motor control contactor. . . . . . . . . . . . . . . . Replace
(only three-phase version)
20 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . Replace
21 - Motor lockout (only three-phase version) . . . . . . . . . . Replace
22 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace the control box
23 - Permanent flame in the combustion head or . . . . . . . Eliminate permanency of flame or
flame simulation
24 - Defective or incorrectly adjusted servomotor . . . . . . . Replace or adjust
25 - The operation solenoid lets little gas through . . . . . . . Increases
26 - Ionisation probe Incorrectly adjusted.. . . . . . . . . . . . . Adjust it, see Fig. 12
27 - Insufficient ionisation (less than 5 µA) . . . . . . . . . . . . Check probe position
28 - Probe earthed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
29 - Burner poorly grounded . . . . . . . . . . . . . . . . . . . . . . . Check grounding
30 - Phase and neutral connections inverted . . . . . . . . . . Invert them
31 - Defective flame detection circuit. . . . . . . . . . . . . . . . . Replace control box
32 - Too much air or too little gas . . . . . . . . . . . . . . . . . . . Adjust air and gas
33 - Probe or ionisation cable earthed . . . . . . . . . . . . . . . Replace worn parts
Signal
25
GB
Interval
Signal
3s
SUGGESTED REMEDY
line
replace control box
6461
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