Fault Finding Logic For Satronic Control Box - Worcester Greenstar Heatslave 12/18 Instruction Manual

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
within 1
Yes No
lights
motor runs?
second?
immediately
motor runs?
Yes
No
Replace
control box
Motor or Replace
Control box
Yes pump Yes motor/
locks out?
seized? pump
No
No
Check
L & N to 230V at
connections/
No
control box? motor?
replace leads
No Yes
Check boiler Motor 40 Ω
Replace
controls & No
across
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
OK?
photo cell
Yes No
230V at
Nozzle
Lockout
No No solenoid
atomising
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.