
FA
U
LT F
IN
D
IN
G
& D
IA
G
R
AM
S
FAULT FINDING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR CAMRAY KITCHEN 12/18-18/25-25/32
8 716 113 000a (01/07)
49
Boiler not
operating
with a
heating /
hot water
demand
Burner
motor runs?
L
oc
kout
within 1
second?
Replace
control b
ox
Replace
motor/pump
Chec
k b
oiler
controls &
supply
Replace
motor
Chec
k L & N
to control
b
ox
Motor or
pump
seized?
Photo cell
functional?
S
olenoid
coil
functional
(100
Ω
)?
Replace
photo cell
Motor gives
50 V
olts on
white wire?
L
oc
kout
after 12 sec
purge?
Replace
control b
ox
Replace
solenoid coil
Replace
motor
Ignition
spark
proved?
Oil to pump?
Drive
coupling
broken?
P
urge
pressure
1-2 bar?
P
ump
produces
pressure?
Replace
pump stem
valve,
pressure
O
K?
Replace
solenoid coil
Chec
k pipe
to nozzle
holder
Replace
nozzle
Replace oil
pump
Replace
control b
ox
Chec
k the
electrodes
& leads
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
Motor 4
0
Ω
between blue &
blac
k wires ?
Replace
control b
ox
Yes
Yes
No
Yes
No
Yes
No
No
No
Yes
No
Nozzle
atomising
fuel?
Combustion
air setting
correct?
Yes
Yes
Combustion
head set
correctly?
S
olenoid operating?
increase the pump
pressure
S
olenoid
coil
functional
(100
Ω
)?
No
Chec
k coil
lead
Yes
Yes
Replace
control b
ox
No
If B
F
remove
burner
snorkle tube
& retest
Flame off &
re-lights?
Yes
Photo cell
functional?
No
Yes
Replace
photo cell
No
Boiler or flue
bloc
ked
No
Reseal B
F
or reposition
terminal
Yes
Replace
control b
ox
Yes
FAULT FINDING LOGIC FOR
535 SE/LD RDB CONTROL BOX
All resist
ance measurements are actual measured values and some variation is to be expected
, therefore measured
values should be similar to but not necess
arily identical to the given values
.
The operation of the photo cell can be tested by measuring the resist
ance across the photo cell
, it should be a high
resist
ance (
greater than 1
0M
Ω
or open circuit
) in the dark and low resist
ance (3k
Ω
or less
) in light
.
Burners on balanced flue systems can recirculate flue products resulting in the burner cycling
, if this happens c
hec
k the
flue system integrity and the terminal position
.
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