Riello 40 GS10 Installation, Use And Maintenance Instructions page 16

Signal Problem
The burner does not
start
No blink
The burner continues
to repeat the start-up
cycle, without lockout
Ignition with pulsa-
tions
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.
20008491
Possible cause
No electrical power supply
A limiter or safety control device is open
Line fuse blocked
Defective control box
No gas supply
Mains gas pressure insufficient
Minimum gas pressure switch fails
to close
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 immedia-
tely 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.
Poorly adjusted head
Ignition electrode incorrectly adjusted
Incorrectly adjusted fan air damper:
too much air
Output during ignition phase is too high
14 GB
Recommended remedy
Close all switches
Check connections
Adjust or replace
Replace
Replace
Open the manual valves
between contactor and train
Contact your GAS COMPANY
Adjust or replace
Reduce the minimum gas pres-
sure switch intervention pres-
sure.
Replace the gas filter cartridge.
Adjust
Adjust
Adjust
Reduce