Fault Finding Logic For Riello Digital Control Box - Worcester GREENSTAR HEATSLAVE 12/18 Instruction Manual

RIELLO
MO535 MRF
DIGITAL
CONTROL BOX
FAULT FINDING
LOGIC
CONTROL BOX IN LOCKOUT
LED CODE - LOCKOUT TYPES
RED steady ON
Lock-out for no flame a er safety
me
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 2.5s ON/ GREEN 0.5s ON
Lock-out for oil-valve failure
ORANGE 0.5s ON / GREEN 0.5s ON
Lock-out for eeprom failure
These fault finding charts are provided to assist
competent and suitably qualified engineers to locate and
rectify faults. Whilst every effort has been taken to ensure
the information given is correct and complete we cannot
guarantee that every eventuality has been covered.
Worcester, Bosch Group cannot be held responsible for
costs incurred by persons not deemed to be competent.
52
FAULT FINDING
A
CONTROL BOX IS MOTOR
Y
SUPPLIED STARTS AFTER
WITH HEAT INITIALIZATION
DEMAND CHECK TIME 3.5s?
N N
CHECK BOILER FAN MOTOR OR
Y
& SYSTEM OIL PUMP
CONTROLS SEIZED?
N
REPLACE
SEIZED
COMPONENT
GO TO
230V TO MOTOR
N
BOX
ACROSS BLUE &
BLACK WIRE?
A
Y
D
APPROX
B
35Ω ACROSS BLUE
& BLACK MOTOR
WIRE?
Y
C
D
E
REPLACE
MOTOR
CAPACITOR
F
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
N
Y FAN RUNS FOR
LESS THAN 12s?
Y
MOTOR GIVES
N Y
5OVac ACROSS
WHITE & BLACK
WIRE?
Y
REPLACE
FAN MOTOR
REMOVE
EXTRANEOUS
LIGHT
N SOLENOID COIL Y
LEAD OK?
N
REPLACE FAN
SOLENOID COIL
MOTOR AND
RESISTANCE
CHECK CONTROL
90 to 110 Ω?
BOX
N
REPLACE
SOLENOID COIL
LEAD
CONTROL BOX IN STANDBY
LED CODE - ANOMALY TYPES
GREEN 0.5s ON / GREEN 2.5s OFF
Pre-hea ng me
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 reset push-bu on or
remote reset failure
WASHING
N
BURNER LOCKS
PRESSURE
OUT AFTER 25s?
1 - 2 BAR?
Y
B
BURNER
CHECK OIL
FIRES WHEN
SUPPLY TO OIL
PHOTOCELL IS
PUMP
COVERED?
N
PHOTOCELL
Y DRIVE COUPLING
RESISTANCE >10
BROKEN?
MΩ IN DARK AND
<10 kΩ IN LIGHT?
N N
REPLACE
REPLACE
PHOTOCELL
OIL PUMP
Y
REPLACE
SOLENOID COIL
Fit pre-heater link
Lock out a er 25s
When anomaly appears during pre-purge,
burner remains in pre-purge.
When anomaly appears a er igni on, burner
remains in opera on.
When anomaly disappears burner restarts.
Remote reset / push bu on is ac vated for
more than 60s.
When anomaly appears burner doesn't stop
6 720 802 432 issue A 04/2012
Y
N
Y
REPLACE
PUMP
COUPLING