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SYMBOL
FAULT
(1)
The burner does not start
The burner does not start
and a function lock out occurs
The burner starts
but stops at maximum
gate valve setting
The burner starts
P
and then locks out
The burner starts and
then locks out
The burner stays
in the pre-purge stage
After pre-purge and
1
safety time,
the burner goes to lock-out
and the flame does not appear
The burner goes to lock-out
right after flame appearance
The burner repeats
the starting cycle
without lock out
Lock out without symbol indication 41 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace control box
During operation, the
burner stops in lock out
Lock out when burner stops
Ignition with pulsation
(1) The control box 19)(A)p.8 is fitted with a disc which rotates during the firing programme, which can be seen through the transparent lock-out reset button. When
the burner does not fire or comes to halt following a fault, the symbol which appears behind the reset button indicates the type of problem.
(2) The fuse is located in the rear part of the control box 19)(A)p.8. A pull-out fuse is also available as a spare part which can be fitted after breaking the tag on the
panel which holds it in place.
PROBABLE CAUSE
1
- No electrical power supply . . . . . . . . . . . . . . . . . . . . . . . . . Close all switches - Check connections
2
- A limiter or safety control device is open. . . . . . . . . . . . . . . Adjust or replace
3
- Control box lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset control box
4
- Control box fuses blown . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
5
- Erroneous electrical connections . . . . . . . . . . . . . . . . . . . . Check connections
6
- Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
7
- No gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open the manual valves between meter and
8
- Mains gas pressure insufficient . . . . . . . . . . . . . . . . . . . . . . Contact your GAS COMPANY
9
- Minimum gas pressure switch fails to close . . . . . . . . . . . . Adjust or replace
10 - Air pressure switch in operating position . . . . . . . . . . . . . . Adjust or replace
11 - Cam I I servomotor contact does not operate . . . . . . . . . . . Adjust cam I I or replace servomotor
control box terminals 11-8
12 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace control box
13 - Defective capacitor
14 - Defective electrical motor . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
15 - Cam I servomotor contact does not operate . . . . . . . . . . . . Adjust cam I or replace servomotor
control box terminals 9-8
Air pressure switch inoperative due to
insufficient air pressure:
16 - Air pressure switch adjusted badly . . . . . . . . . . . . . . . . . . . Adjust or replace
17 - Pressure switch pressure point pipe blocked . . . . . . . . . . . Clean
18 - Head wrongly adjusted . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
19 - Fault in flame detection circuit. . . . . . . . . . . . . . . . . . . . . . . Replace control box
20 - Cam I I I servomotor contact does not operate . . . . . . . . . . Adjust cam I I I or replace servomotor
control box terminals 10-8
21 - The solenoid VR allows little gas through . . . . . . . . . . . . . . Increase
22 - Solenoid valves VR or VS fail to open . . . . . . . . . . . . . . . . Renew the coil or rectifier panel
23 - Gas pressure too low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase pressure at governor
24 - Ignition electrode wrongly adjusted. . . . . . . . . . . . . . . . . . . Adjust, see fig. (C)p.14
25 - Electrode grounded due to broken insulation . . . . . . . . . . . Replace
26 - High voltage cable defective . . . . . . . . . . . . . . . . . . . . . . . . Replace
27 - High voltage cable deformed by high temperature . . . . . . . Replace and protect
28 - Ignition transformer defective . . . . . . . . . . . . . . . . . . . . . . . Replace
29 - Erroneous valve or transformer electrical connections . . . . Repeat connection
30 - Control box defective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
31 - A cock down-line of the gas train is closed . . . . . . . . . . . . . Open
32 - Air in pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bleed air
33 - The solenoid VR allows little gas through . . . . . . . . . . . . . . Increase
34 - Ionisation probe wrongly adjusted. . . . . . . . . . . . . . . . . . . . Adjust, see fig. (C)p.14
35 - Faulty electrical connections for probe . . . . . . . . . . . . . . . . Repeat connection
36 - Insufficient ionisation (less than 12 µA). . . . . . . . . . . . . . . . Check probe position
37 - Probe grounded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
38 - Max. gas pressure switch operates. . . . . . . . . . . . . . . . . . . Adjust or replace
39 - Defective control box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
40 - Mains gas pressure is near the value to which the . . . . . . . Reduce operating pressure
min. gas pressure switch gas is adjusted. The
repeated drop in pressure which follows valve
opening 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 firing cycle is
repeated. The sequence repeats endlessly.
42 - Probe or ionisation cable grounded . . . . . . . . . . . . . . . . . . Replace worn parts
43 - Fault on air pressure switch . . . . . . . . . . . . . . . . . . . . . . . . Replace
44 - Max. gas pressure switch operates. . . . . . . . . . . . . . . . . . . Adjust or replace
45 - Flame remains in combustion head . . . . . . . . . . . . . . . . . . Eliminate persistence of flame
or flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . or replace control box
46 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust, see page 17
47 - Ignition electrode wrongly adjusted. . . . . . . . . . . . . . . . . . . Adjust, see fig. (C),page 14
48 - Poorly adjusted fan air gate: too much air. . . . . . . . . . . . . . Adjust
49 - Output during ignition phase is too high . . . . . . . . . . . . . . . Reduce
40
SUGGESTED REMEDY
(2)
train
of minimum gas pressure
switch.
Replace gas filter.
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