
20013746 12
N.B.: If problems still occur after all of the above checks have been made, check the electrical connections
on the plug and sockets, the damper and burner motor, gas control wiring ignition transformer and
external interlocks, if the burner still fails to function, replace the control box.
7 pulses The burner goes
into lockout immedi-
ately following the
appearance of the
flame
24 - The operation solenoid lets little gas
through
Increase
25 - Ionisation probe incorrectly adjusted Adjust, see page 4
26 - Insufficient ionisation (less than 5 A) Check probe position
27 - Earth probe. . . . . . . . . . . . . . . . . . . Withdraw or replace cable
28 - Burner poorly grounded . . . . . . . . . Check grounding
29 - Phase and neutral connections
inverted
Invert them
30 - Defective flame detection circuit. . . Replace the control box
Burner goes into
lockout during oper-
ation
31 - Probe or ionisation cable grounded Replace worn parts
10 pulses The burner does
not switch on, and
the lockout appears
32 - Incorrect electrical wiring . . . . . . . . Check
The burner goes
into lockout
33 - Defective control box . . . . . . . . . . . Replace
34 - Presence of electromagnetic . . . . .
disturbances in the thermostat lines
Filter or eliminate
No puls The burner does
not start
35 - No electrical power supply . . . . . . . Close all switches - Check con-
nections
36 - A limiter or safety control device is
open
Adjust or replace
37 - Line fuse blocked . . . . . . . . . . . . . . Replace
38 - Defective control box . . . . . . . . . . . Replace
39 - No gas supply. . . . . . . . . . . . . . . . . Open the manual valves
between contactor and train
40 - Mains gas pressure insufficient . . . Contact your GAS COMPANY
41 - Minimum gas pressure switch fails to
close
Adjust or replace
The burner contin-
ues to repeat the
start-up cycle, with-
out lockout
42 - 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 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
ignition cycle is repeated. And so on
Reduce the minimum gas pres-
sure switch intervention pres-
sure. Replace the gas filter
cartridge.
Ignition with pulsa-
tions
43 - Poorly adjusted head . . . . . . . . . . . Adjust. See page 6
44 - Ignition electrode incorrectly
adjusted
Adjust, see page 4
45 - Incorrectly adjusted fan air damper:
too much air
Adjust
46 - Output during ignition phase is too
high
Reduce
Signal Problem Possible cause Recommended remedy