43
Grant Vortex Oil Boilers
10 - FAULT FINDING
Burner fault finding
10.1
Motor/pump
seized
or
tight
Replace
motor
capacitor
Burner
motor
runs
Check
L
&
N
to
control
box
Check
boiler
controls
Motor
gives
50
V
olts
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
W
ashing
pressure
1t
o2b
a
r
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
o
ff
and
relights
Boiler
o
r
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
-
5
3
V
AC
to
control
box.
T
est
solenoid
coil
for
continuity
or
100
ohms.
T
est
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.