31
20040559
GB
Faults - Probable causes - Solutions
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 seconds.
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 approxi-
mately 3 seconds.
The number of pulses will provide the information on the possible
faults, according to .
8
Faults - Probable causes - Solutions
RED LED on
wait at least 10 seconds
Press button for
> 3 seconds
signal
Interval
3 seconds
signal
Signal
Problem
Possible cause
Recommended remedy
2 blinks
Once the pre-purging
phase and safety time
have passed, the burn-
er 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 it
Electrode grounded due to broken insulation
Replace
High voltage cable defective
Replace
High voltage cable deformed by high temperature Replace and protect
Ignition transformer defective
Replace
Incorrect valve or transformer electrical wiring
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 lock-
out 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 pulses
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 servomotor
Adjust or replace
