3159
11
The sequence of pulses issued by the control box identifies the possible types of malfunction, which are listed in
the table below.
Signal
Problem
Possible cause
Recommended remedy
2 blinks
Once the pre-purg-
ing phase and safety
time have passed,
the burner goes into
lockout without the
appearance of the
flame
The operation solenoid lets little gas
through
Increase
One of the two solenoid valves does not
open.
Replace
Gas pressure too low
Increase pressure at governor
Ignition electrode incorrectly adjusted
Adjust
Electrode grounded due to broken insula-
tion
Replace
High voltage cable defective
Replace
High voltage cable deformed by high tem-
perature
Replace and protect
Ignition transformer defective
Replace
Incorrect valve or transformer electrical wir-
ing
Check
Defective control box
Replace
A closed valve upline the gas train
Open
Air in pipework
Bleed air
Gas valves unconnected or with interrupted
coil
Check connections or replace
coil
3 blinks
The burner does not
switch on, and the
lockout appears
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:
Air pressure switch incorrectly adjusted.
Adjust or replace
Pressure switch pressure test point pipe
blocked
Clean
Poorly adjusted head
Adjust
High pressure in the furnace
Connect air pressure switch to
fan suction line
Lockout during pre-
purging phase
Defective motor control contactor
(only three-phase version)
Replace
Defective electrical motor
Replace
Motor lockout (defective electrical motor)
Replace
4 blinks
The burner switches
on, but then stops in
lockout
Flame simulation
Replace the control box
Lockout when
burner stops
Permanent flame in the combustion head or
flame simulation
Eliminate persistence of flame
or replace control box
6 blinks
The burner switches
on, but then stops in
lockout
Defective or incorrectly adjusted servomo-
tor
Adjust or replace
