25
6461
GB
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.
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
FAULT
PROBABLE CAUSE
SUGGESTED REMEDY
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
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
3 x blinks
The burner does not
switch on, and the
lockout appears
14 - Air pressure switch in operating position . . . . . . . . . . Adjust or replace
The burner switches
on, but then stops in
lockout
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
line
Lockout during pre-
purging phase
19 - Defective motor control contactor. . . . . . . . . . . . . . . . Replace
(only three-phase version)
20 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . Replace
21 - Motor lockout (only three-phase version) . . . . . . . . . . Replace
4 pulses
The burner switches
on, but then stops in
lockout
22 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace the control box
Lockout when burner
stops
23 - Permanent flame in the combustion head or . . . . . . . Eliminate permanency of flame or
flame simulation
replace control box
6 x blinks
The burner switches
on, but then stops in
lockout
24 - Defective or incorrectly adjusted servomotor . . . . . . . Replace or adjust
7 pulses
The burner goes into
lockout immediately
following the
appearance of the
flame
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
Burner locks out
when shifting from
minimum to maximum
output and vice versa
32 - Too much air or too little gas . . . . . . . . . . . . . . . . . . . Adjust air and gas
Burner goes into
lockout during
operation
33 - Probe or ionisation cable earthed . . . . . . . . . . . . . . . Replace worn parts
3s
Signal
Signal
RED LED on
press reset for 10s
Interval
Press button
for > 3s
Faults - Probable causes - Solutions
6
