47
Fault Finding
12.2 Burner Fault Finding - Riello RDB burners
Motor/pump
seized
or tight
Replace
motor
capacitor
Burner
motor runs
Check L & N
to control
box
Check
boiler
controls
Motor gives
50 Volts
to white wire
*
Replace
burner
motor
Repair
or replace
motor/pump
Lockout
after 12 sec
purge
Lockout
within
1 second
Replace
solenoid
coil
Coil of
solenoid
sound **
Repair or
replace
oil pump
Washing
pressure
1 to 2 bar
Photocell
sound ***
If balanced flue,
remove air tube
and retest
Reseal
balanced flue
or reposition flue
Replace
photocell
Drive
coupling
broken
Pump
produces
pressure
Replace
nozzle
Contaminated
fuel or
filter
Combustion
air set
Flame off
and
relights
Boiler or
flue
blocked
Combustion
head set
YES NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO YES
NO
NO
NO
Check and
set the
electrodes
Replace
the
control box
Ignition
spark
proved
NO
NO
NO
NO
NO
OK
NO
NO
NO
NO
Solenoid
valve
operating
Replace
control
box
Check oil
pressure
regulator
Replace coil
and/or
stem valve
Nozzle
atomising
fuel
NO
YES
NO
NO
Notes
*
**
***
Motor white wire returns 50 - 53
V AC
to control box.
Test solenoid coil for continuity or 100
ohms.
Test photocell by disconnecting it in
control box. If burner fires and then
goes to lockout, photocell should be
replaced.
It is best to replace the photocell if it is
suspect.
Burners on balanced flue systems can
recirculate flue products causing
burner recycling. If this happens,
check flue position and sealing.
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