Riello 3755489, Installation, Use And Maintenance Instructions

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3159
12
7 blinks The burner goes into
lockout immediately
following the appear-
ance of the flame The operation solenoid lets little gas
through Increase
Ionisation probe incorrectly adjusted Adjust
Insufficient ionisation (less than 5 A) Check probe position
Earth probe Withdraw or replace cable
Burner poorly grounded Check grounding
Phase and neutral connections inverted Invert them
Defective flame detection circuit Replace the control box
Burner lockout mov-
ing between 1st and
2nd stages, or
between 2nd and 1st
stages Too much air or too little gas Adjust air and gas
Burner goes into
lockout during oper-
ation Probe or ionisation cable grounded Replace worn parts
10 blinks The burner does not
switch on, and the
lockout appears Incorrect electrical wiring Check
The burner goes into
lockout Defective control box Replace
Presence of electromagnetic disturbances
in

the thermostat lines
Presence of electromagnetic disturbance
Filter or eliminate
Use the radio disturbance pro-
tection kit
No blink The burner does not
start No electrical power supply Close all switches - Check con-
nections
A limiter or safety control device is open Adjust or replace
Line fuse blocked Replace
Defective control box Replace
No gas supply Open the manual valves
between contactor and train
Mains gas pressure insufficient Contact your GAS COMPANY
Minimum gas pressure switch fails to close Adjust or replace
Servomotor fails to move to min. ignition
position
Replace
The burner contin-
ues to repeat the
start-up cycle, with-
out lockout 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.
Signal Problem Possible cause Recommended remedy