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Signal
Once the pre-purging phase
2 blinks
and safety time have passed,
the burner goes into lockout
without the appearance of the
flame
The burner does not switch
3 blinks
on, and the lockout appears
The burner switches on, but
then stops in lockout
Lockout during pre-purging
phase
The burner switches on, but
4 pulses
then stops in lockout
Lockout when burner stops
The burner switches on, but
6 blinks
then stops in lockout
The burner goes into lockout
7 blinks
immediately following the
appearance of the flame
Burner locks out when shift-
ing from minimum to maxi-
mum output and vice versa
Burner goes into lockout dur-
ing operation
The burner does not switch
10 blinks
on, and the lockout appears
The burner goes into lockout
No blink
The burner does not start
The burner continues to
repeat the start-up cycle,
without lockout
Ignition with pulsations
Burner does not reach maxi-
mum output
Burner stops with air damper
open
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 - Defective or incorrectly adjusted servomotor. . . . . . . . .
25 - The operation solenoid lets little gas through . . . . . . . .
26 - Ionisation probe incorrectly adjusted . . . . . . . . . . . . . . .
27 - Insufficient ionisation (less than 5 A) . . . . . . . . . . . . . . .
28 - Earth probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29 - Burner poorly grounded . . . . . . . . . . . . . . . . . . . . . . . . .
30 - Phase and neutral connections inverted . . . . . . . . . . . .
31 - Defective flame detection circuit . . . . . . . . . . . . . . . . . .
32 - Too much air or too little gas . . . . . . . . . . . . . . . . . . . . .
33 - Probe or ionisation cable grounded . . . . . . . . . . . . . . . .
34 - Incorrect electrical wiring . . . . . . . . . . . . . . . . . . . . . . . .
35 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
36 - Presence of electromagnetic disturbances in the thermo-
stat lines
37 - Presence of electromagnetic disturbance
38 - No electrical power supply . . . . . . . . . . . . . . . . . . . . . . .
39 - A limiter or safety control device is open . . . . . . . . . . . .
40 - Line fuse blocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
42 - No gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43 - Mains gas pressure insufficient . . . . . . . . . . . . . . . . . . .
44 - Minimum gas pressure switch fails to close. . . . . . . . . .
45 - Servomotor fails to move to min. ignition position . . . . .
46 - The gas pressure in the gas mains lies very close to the
value to which the minimum gas pressure switch has
been set. The sudden drop in pressure after valve open-
ing causes temporary opening of the pressure switch
itself, the valve immediately closes and the burner
comes to a halt. Pressure increases again, the pressure
switch closes again and the ignition cycle is repeated.
And so on
47 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . .
48 - Ignition electrode incorrectly adjusted . . . . . . . . . . . . . .
49 - Incorrectly adjusted fan air damper: too much air . . . . .
50 - Output during ignition phase is too high. . . . . . . . . . . . .
51 - Remote control device TR fails to close. . . . . . . . . . . . .
52 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . .
53 - Defective servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . .
54 - Defective servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . .
Possible cause
38
Recommended remedy
Increase
Replace
Increase pressure at governor
Adjust, see fig. (C) page 14
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
Adjust or replace
Increase
Adjust, see fig. (C) page 14
Check probe position
Withdraw or replace cable
Check grounding
Invert them
Replace the control box
Adjust air and gas
Replace worn parts
Check
Replace
Filter or eliminate
Use the radio disturbance protection kit
Close all switches - Check connections
Adjust or replace
Replace
Replace
Open the manual valves between contactor
and train
Contact your GAS COMPANY
Adjust or replace
Replace
Reduce the minimum gas pressure switch
intervention pressure. Replace the gas filter
cartridge.
Adjust. See page 17
Adjust, see fig. (C) page 14
Adjust
Reduce
Adjust or replace
Replace
Replace
Replace
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