11
2736
GB
7.
FAULTS / SOLUTIONS
Here below you can find some causes and the possible solutions for some problems that could cause a fail-
ure to start or a bad working of the burner. A fault usually makes the lock-out lamp light which is situated
inside the reset button of the control box (9, fig. 1, page 1).
When lock out lamp lights the burner will attempt to light only after pushing the reset button. After this if the burner
functions correctly, the lock-out can be attributed to a temporary fault.
If however the lock out continues the cause must be determined and the solution found.
BURNER STARTING DIFFICULTIES
Signal
Problem
Possible cause
Recommended remedy
2 blinks
Once the pre-pur-
ging phase and sa-
fety time have
passed, the burner
goes into lockout
without the appea-
rance 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
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
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 in-
sufficient 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 bur-
ner stops
Permanent flame in the combustion
head or flame simulation
Eliminate persistence of flame
or replace control box
