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Replace
Boiler not
control box
operating
with a
heating /
Yes
hot water
demand
230V at
Replace
solenoid coil
No
pump
in purge?
Yes
Lockout
Burner
Burner
Yes
No
within 1
lights
motor runs?
second?
immediately
motor runs?
Yes
No
Replace
control box
Motor or
Replace
Control box
pump
motor/
Yes
Yes
locks out?
seized?
pump
No
No
Check
L & N to
230V at
No
connections/
control box?
motor?
replace leads
No
Yes
Check boiler
Motor 40
Ω
Replace
controls &
across
No
motor
supply
L & N?
Yes
Note: This chart assumes all wiring within the control box base is correct, if in doubt
check the wiring against the diagram on the base of the control box before replacing
Replace
any components.
motor
All resistance measurements are actual measured values and some variation is to be
capacitor
expected, therefore measured values should be similar to but not necessarily identical
to the given values.
The operation of the photo cell can be tested by measuring the resistance across the
photo cell, it should be a high resistance (greater than 10MΩ or open circuit) in the
dark and low resistance (15kΩ or less) in light.
Burners on balanced flue systems can recirculate flue products resulting in the burner
cycling, if this happens check the flue system integrity and the terminal position.
FAULT FINDING
& DIAGRAMS
Replace
No
lead
Disconnect photo cell,
reset lockout, burner
lights then locks out?
Pump
Spark
No
produces
Yes
Yes
after purge
produced?
pressure?
No
No
Drive
coupling
broken?
230V at
Transformer
No
No
transformer?
Yes
Oil to
pump?
Electrodes
& leads
Yes
control box
OK?
Yes
Replace oil
pump
Replace
transformer
Stray light
Photo cell
Replace coil
Yes
on photo
lead OK?
lead
cell?
No
Yes
No
Replace
Coil lead
No
photo cell
OK?
No
Yes
Nozzle
230V at
Lockout
No
atomising
No
solenoid
coil?
fuel?
before oil
solenoid
Yes
opens?
Combustion
air setting
correct?
Yes
Combustion
lead OK?
head set
correctly?
Yes
Yes
Replace
Flame off
Boiler or
No
and
flue blocked
re-lights?
Yes
If BF
remove
burner
Reseal BF
snorkle tube
Yes
on
& retest.
reposition
Lights OK?
No
Replace
Yes
control box
Photo cell
functional?
No
Replace
photo cell
Replace
Yes
control box
Replace
2.2k
Ω
Yes
No
solenoid coil
across
solenoid
coil?
Yes
Solenoid
Replace
No
operating?
pump
Yes
Pipe to
nozzle
holder OK?
Yes
Oil check
Replace oil
valve OK?
check valve
No
(if fitted)
(if fitted)
Yes
Replace
nozzle
Measure all 230V tests between
Neutral (N) and the pin, wire or
terminal specified.
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