BURNERFIRES WHEN PHOTOCELL IS COVERED?
APPROX35Ω ACROSS BLUE & BLACK MOTOR
WIRE?
COILRESISTANCE 90 to 110Ω?
MOTORSTARTS AFTER INITIALIZATION CHECK TIME 3.5s?
CONTROL BOX IS SUPPLIEDWITH HEAT DEMAND
REPLACEOIL PUMP
AFTER 15s25‐30Vdc TO COIL? (COIL CONNECTED)
CLEAN OR REPLACE PUMP & FUEL LINE FILTERS
IF BALANCED FLUE; REMOVE SNORKEL AND TEST ‐ NOW OK?
REPLACEPUMP
COUPLING
NOZZLE ATOMIZING THE
FUEL?
BOILER OR FLUE BLOCKED?
ARE ELECTRODES OK & SET
CORRECTLY?
WASHING PRESSURE 1 ‐ 2 BAR?
DRIVE COUPLING BROKEN?
COIL RELEASES WORKING PRESSURE?
NOZZLENEW?
CHECK OIL PIPE FROM PUMP TO NOZZLE HOLDER
FAN RUNS FOR LESS THAN 12s?
IGNITIONSPARK
PRESENT?
AIR SET CORRECTLY?
CHECK OIL SUPPLY TO OIL
PUMP
CONTAMINATEDFUEL FILTERS?
IGNITIONLEADS OK?
FLAME GOES OUT THENRE‐LIGHTS?
COMBUSTION HEAD SET CORRECTLY?
Y
FAN MOTOR OR OIL PUMPSEIZED?
N
RESET COMBUSTION
HEAD
ADJUST COMBUSTION AIR SETTING
REPLACECOIL
REPLACE OR RESET
ELECTRODES
CLEAN OR REPLACE FILTERS
CLEAR BLOCKAGE
REPLACEOIL PUMP
REPLACE CONTROL BOX
REPLACE IGNITIONLEADS
REPLACESEIZED
COMPONENT
REPLACE MOTOR
CAPACITOR
REPLACE PHOTOCELL
CHECK BOILER & SYSTEM CONTROLS
REPLACE FAN MOTOR AND
CHECK CONTROL BOX
GREEN 0.5s ON / RED 0.5s ON
Anomaly for presence of extraneous light
ORANGE steady ON
Anomaly for presence of abnormal frequency supply
ORANGE 0.2s ON / GREEN 0.2s ON
Control box internal error
GREEN 0.2s ON / RED 0.2s ON
Anomaly for resetpush‐buttonfailure
Only motor runs.Lock out after 25s.
When anomaly appears during pre‐purge, burner remains in pre‐purge.
When anomaly appears after ignition, burner remains in operation.
When anomaly disappears burner restarts.
Push button is activated for more than 60s.When anomaly appears burner doesn't stop.
CHECK FLUE POSITION &
SEALS
230V TO MOTOR ACROSS BLUE & BLACK WIRE?
MOTOR GIVES 5OVac ACROSS WHITE & BLACK
WIRE?
COILRESISTANCE 90 to 110 Ω?
REPLACECOIL
BALANCED FLUE CAN RECIRCULATE GASES CAUSING
RECYCLING
PHOTOCELL RESISTANCE >10 MΩ IN DARK AND <10 kΩ INLIGHT?
BURNER LOCKS OUT AFTER 25s?
N
Y
N
N
Y
Y
N
Y
N
YYYYYNN
Y
Y
N N
N
Y Y N N N N
N
N
Y
Y
N
Y
NN
N
N
Y Y
Y
N
Y Y N
N
Y
N
Y
N
Y
Y
REPLACE NOZZLE
COILLEAD OK?
REPLACECOIL LEAD
Y
N
LIGHT DIAGNOSIS FEATURE (FLAME STRENGTH INDICATOR)(see instruction manual)
Sequence for enable / disable
This can only be carried out during operation (burner running)
Press and hold the reset button for 15‐20 sec. LED ‐ RED blink 2 times after 5 sec. LED ‐ GREEN blink 1 time after 10 sec. LED ‐ GREEN blink 2 times
Release the reset button LED ‐ GREEN OFF
Press the reset button 1 time for enable or 2 times for disable LED ‐ GREEN ON and OFF for each press and release After 10 sec LED ‐ GREEN blinking for the programmedtimes (0.5s ON / 0.5s OFF)
Y
N
REPLACEFAN MOTOR
PHOTOCELL RESISTANCE >10 MΩ IN DARK AND <10 kΩ IN LIGHT?
REPLACE PHOTOCELL
REMOVE EXTRANEOUS
LIGHT
Y
GREEN 0.5s ON / GREEN 2.5s OFF
Pre‐heating time(gas oil units only)
Fit pre‐heater link
POST PURGE FEATURE(see instruction manual)
Sequence for post‐purge programming
This can only be carried out during operation (burner running)
Press push‐button for 10 to 15 sec LED ‐ GREEN flash 1 time
Release push‐button LED ‐ GREEN OFF
Press push‐button 1 to 6 times for selection (see TIMINGS) LED ‐ GREEN ON and OFF for each press and release
After 10 sec LED ‐ GREEN blinking for the programmedtimes (0.5s ON / 0.5s OFF)
NOTE: If heat demand switches off during the post purgeprogramming sequence the control box will revert to theprevious setting. If the heat demand switches off after theprogramming sequence but during the final light flashingconfirmation stage of the programming, the new settingwill be saved.
POST PURGE FEATURE(see instruction manual)
LIGHT DIAGNOSTICS FEATURE (PHOTOCELL STRENGTH / LIGHT LUX LEVEL INDICATOR)(see instruction manual)
LED CODES ‐ ANOMALY TYPE(control box in standby)
FAULT FINDINGLOGIC FOR
DIGITAL CONTROL BOX TYPE
MO535‐MPF
RIELLO RDB SERIES OIL BURNERS
RED 0.5s ON / RED 0.5s OFF
Lock‐out for false flame signal
RED 0.2s ON / RED 0.2s OFF
Lock‐out for max n° of recycles
RED 2.5s ON / ORANGE 0.5s ON
Lock‐out for fan motor failure
RED steady ON
Lock‐out for no flame after safety time
ORANGE 0.5s ON / GREEN 0.5s ON
Control box internal error
RED 2.5s ON/ GREEN 0.5s ON
Lock‐out for oil‐valve failure
LED CODE ‐ LOCKOUT TYPES(control box in lock out)
GO TOBOX
D
D
A
F
E
C
B
A
E
C
B
F
TIMINGS
1 = 10 sec. (default) 2 = 20 sec. 3 = 30 sec. 4 = 60 sec. 5 = 120 sec. 6 = 0 sec. (disable)
‐ 1 flash‐ 2 flash‐ 3 flash‐ 4 flash‐ 5 flash‐ 6 flash
LIGHT LEVEL
Minimum Good Very good
‐ 1 to 2 flash‐ 3 to 4 flash‐ 5 to steady on
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