20014622
15
GB
N.B.:
If problems still occur after all of the above checks have been made, check the electrical connec-
tions 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.
3 blinks
The burner does not
switch on, and the
lockout appears
14 - Air pressure switch in operating position . Adjust or replace
The burner switches
on, but then stops in
lockout
- Air pressure switch inoperative due to
insufficient air pressure:
15 - Air pressure switch incorrectly adjusted. . Adjust or replace
16 - Pressure switch pressure test point . . . .
pipe blocked
Clean
17 - Poorly adjusted head . . . . . . . . . . . . . . . . Adjust
18 - High pressure in the furnace . . . . . . . . . . Connect air pressure switch to fan
suction line
Lockout during pre-
purging phase
19 - Defective motor control contactor . . . . . .
(only three-phase version)
Replace
20 - Defective electrical motor . . . . . . . . . . . . Replace
21 - Motor lockout (defective electrical motor) Replace
4 pulses
The burner switches
on, but then stops in
lockout
22 - Flame simulation . . . . . . . . . . . . . . . . . . . Replace the control box
Lockout when burner
stops
23 - Permanent flame in the combustion . . . .
head or flame simulation
Eliminate persistence of flame or
replace control box
7 blinks
The burner goes into
lockout immediately
following the appear-
ance 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 lock-
out during operation
31 - Probe or ionisation cable grounded . . . . . Replace worn parts
10 blinks
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 blink
The burner does not
start
35 - No electrical power supply. . . . . . . . . . . . Close all switches - Check connec-
tions
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 continues
to repeat the start-up
cycle, without lockout
42 - The gas pressure in the gas mains lies
very close to the value to which the mini-
mum gas pressure switch has been set.
The sudden drop in pressure after valve
opening causes temporary opening of the
pressure switch itself, the valve immedi-
ately closes and the burner comes to a
halt. Pressure increases again, the pres-
sure switch closes again and the ignition
cycle is repeated. And so on
Reduce the minimum gas pressure
switch intervention pressure.
Replace the gas filter cartridge.
Ignition with pulsations 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
