Riello 40 FS20 Installation, Use And Maintenance Instructions page 38

Signal Problem
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 43 - Poorly adjusted head . . . . . . . . . . . . . . . . Adjust. See page 6
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.
20033828
Possible cause
32 - Incorrect electrical wiring . . . . . . . . . . . . . Check
33 - Defective control box . . . . . . . . . . . . . . . . Replace
34 - Presence of electromagnetic . . . . . . . . . .
disturbances in the thermostat lines
35 - No electrical power supply . . . . . . . . . . . . Close all switches - Check connec-
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
40 - Mains gas pressure insufficient . . . . . . . . Contact your GAS COMPANY
41 - Minimum gas pressure switch fails to. . . .
close
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
44 - Ignition electrode incorrectly adjusted . . . Adjust, see page 4
45 - Incorrectly adjusted fan air damper: too
much air
46 - Output during ignition phase is too high . . Reduce
12 GB
Recommended remedy
Filter or eliminate
tions
contactor and train
Adjust or replace
Reduce the minimum gas pressure
switch intervention pressure.
Replace the gas filter cartridge.
Adjust