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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 (8, 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
2 blinks
Once the pre-purging
phase and safety time
have passed, the
burner goes into lock-
out without the appear-
ance of the flame
3 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
7 blinks
The burner goes into
lockout immediately
following the appear-
ance of the flame
Burner goes into lock-
out during operation
20014622
Problem
1 - The operation solenoid lets little gas . . . .
through
2 - One of the two solenoid valves does . . .
not open.
3 - Gas pressure too low. . . . . . . . . . . . . . . .
4 - Ignition electrode incorrectly adjusted . . .
5 - Electrode grounded due to broken . . . . .
insulation
6 - High voltage cable defective . . . . . . . . . .
7 - High voltage cable deformed by high . . .
temperature
8 - Ignition transformer defective . . . . . . . . .
9 - Incorrect valve or transformer . . . . . . . . .
electrical wiring
10 - Defective control box . . . . . . . . . . . . . . . .
11 - A closed valve upline the gas train . . . . .
12 - Air in pipework . . . . . . . . . . . . . . . . . . . . .
13 - Gas valves unconnected or with . . . . . . .
interrupted coil
14 - Air pressure switch in operating position .
- Air pressure switch inoperative due to
insufficient air pressure:
15 - Air pressure switch incorrectly adjusted. .
16 - Pressure switch pressure test point . . . .
pipe blocked
17 - Poorly adjusted head . . . . . . . . . . . . . . . .
18 - High pressure in the furnace . . . . . . . . . .
19 - Defective motor control contactor . . . . . .
(only three-phase version)
20 - Defective electrical motor . . . . . . . . . . . .
21 - Motor lockout (defective electrical motor)
22 - Flame simulation . . . . . . . . . . . . . . . . . . .
23 - Permanent flame in the combustion . . . .
head or flame simulation
24 - The operation solenoid lets little gas . . . .
through
25 - Ionisation probe incorrectly adjusted . . . .
26 - Insufficient ionisation (less than 5 A) . . . .
27 - Earth probe . . . . . . . . . . . . . . . . . . . . . . .
28 - Burner poorly grounded . . . . . . . . . . . . . .
29 - Phase and neutral connections inverted .
30 - Defective flame detection circuit . . . . . . .
31 - Probe or ionisation cable grounded . . . . .
Possible cause
16 GB
Recommended remedy
Increase
Replace
Increase pressure at governor
Adjust, see page 4
Replace
Replace
Replace and protect
Replace
Check
Replace
Open
Bleed air
Check connections or replace coil
Adjust or replace
Adjust or replace
Clean
Adjust
Connect air pressure switch to fan
suction line
Replace
Replace
Replace
Replace the control box
Eliminate persistence of flame or
replace control box
Increase
Adjust, see page 4
Check probe position
Withdraw or replace cable
Check grounding
Invert them
Replace the control box
Replace worn parts
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