Riello 40 Installation, Use And Maintenance Instructions page 42

Signal Problem
7 blinks The burner goes into
lockout immediately
following the appear-
ance of the flame
Burner lockout moving
between 1st and 2nd
stages, or between
2nd and 1st stages
Burner goes into lock-
out during operation
10 blinks The burner does not
switch 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 46 - Poorly adjusted head . . . . . . . . . . . . . . . . Adjust. See page 6
The burner does not
move into the 2nd
stage
Burner stops with air
damper open
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.
20033980
Possible cause
25 - The operation solenoid lets little gas . . . .
through
26 - Ionisation probe incorrectly adjusted . . . . Adjust, see page 4
27 - Insufficient ionisation (less than 5 A) . . . . Check probe position
28 - Earth probe. . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
29 - Burner poorly grounded . . . . . . . . . . . . . . Check grounding
30 - Phase and neutral connections inverted . Invert them
31 - Defective flame detection circuit. . . . . . . . Replace the control box
32 - Too much air or too little gas . . . . . . . . . . Adjust air and gas
33 - Probe or ionisation cable grounded . . . . . Replace worn parts
34 - Incorrect electrical wiring . . . . . . . . . . . . . Check
35 - Defective control box . . . . . . . . . . . . . . . . Replace
36 - Presence of electromagnetic . . . . . . . . . .
disturbances in the thermostat lines
37 - No electrical power supply . . . . . . . . . . . . Close all switches - Check connec-
38 - A limiter or safety control device is open . Adjust or replace
39 - Line fuse blocked . . . . . . . . . . . . . . . . . . . Replace
40 - Defective control box . . . . . . . . . . . . . . . . Replace
41 - No gas supply. . . . . . . . . . . . . . . . . . . . . . Open the manual valves between
42 - Mains gas pressure insufficient . . . . . . . . Contact your GAS COMPANY
43 - Minimum gas pressure switch fails to. . . .
close
44 - Servomotor fails to move to min. ignition .
position
45 - 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
47 - Ignition electrode incorrectly adjusted . . . Adjust, see page 4
48 - Incorrectly adjusted fan air damper: too . .
much air
49 - Output during ignition phase is too high . . Reduce
50 - Remote control device TR fails to close . . Adjust or replace
51 - Defective control box . . . . . . . . . . . . . . . . Replace
52 - Defective servomotor . . . . . . . . . . . . . . . . Replace
53 - Defective servomotor . . . . . . . . . . . . . . . . Replace
12 GB
Recommended remedy
Increase
Filter or eliminate
tions
contactor and train
Adjust or replace
Replace
Reduce the minimum gas pressure
switch intervention pressure.
Replace the gas filter cartridge.
Adjust