Fault Finding
41
12.4 Riello RDB Burner Fault Finding
Burner
motor runs
Yes
Lockout
within 1
second
No
Lockout
after 12 sec
purge
Yes
Ignition
spark
proved
Yes
Pump
produces
pressure
Yes
Yes
Yes
Yes
Nozzle
atomising
fuel
Yes
Combustion
air set
Combustion
head set
Yes
No
Yes
No
No
No
No
No
No
No
No
No
Yes
Check L & N
to control
box
Yes
Motor/pump
seized or
tight
Check boiler
controls
Replace
motor
capacitor
Yes
Repair or
replace
motor/pump
Check and
set the
electrodes
Washing
pressure 1
to 2 bar
Yes
Solenoid
valve
operating
No
Replace
nozzle
Flame off
and relights
Replace the
control box
Drive
coupling
broken
Check oil
pressure
regulator
No
No
No
No
OK
Repair or
replace oil
pump
Replace coil
and/or stem
valve
Photocell
sound
Coil of
solenoid
sound
Motor gives
50 Volts to
white wire
Replace
control box
Contaminated
fuel or filter
If balanced flue,
remove air tube
and retest
Replace
photocell
Replace
solenoid
coil
Replace
burner
motor
Reseal balanced
flue or reposition
flue
Boiler or
flue blacked
Yes
No
No
!
NOTES
Photocell testing is very difficult without
the use of a lux meter.
It is best to replace the photocell if it is
suspect.
Motor white wire returns 50 - 53 V AC
to control box.
Test solenoid coil for continuity or 100
ohms.
Burners on balanced flue systems can
recirculate flue products causing burner
recycling. If this happens, check flue
position and sealing.
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