Baxi Solo 3 30 PF Installation And Servicing Instructions page 43

YES
Does
the pilot burner
light ?
NO
Check there is
20mbar gas pressure
at the inlet to gas valve
Check the pilot injector is
not blocked, partially
blocked or damaged
Replace the gas
valve
Testing Potentiometer
Three Pin Connector
Set multimeter to the 2 M OHM
scale. Turn potentiometer to the
OFF position, connect
multimeter leads to the blue/red wire
and centre black/yellow wire of three
pin connector.
The reading on the multimeter
should indicate approx 1 M OHM,
switch potentiometer to the ON
position, the reading on the
multimeter should be approx 1 M
OHM. Slowly turn potentiometer
knob to the FULL ON position, the
reading on the multimeter should
decrease, proportionally down to 0
OHMs.
Connect multimeter to centre
black/yellow wire and red/yellow
wire, turn potentiometer knob to fully
OFF position, reading on multimeter
should be 0 OHM. Switch
potentiometer to ON position, slowly
turn potentiometer knob to the fully
ON position, the reading on
multimeter should increase
proportionally to 1 M OHM, turn
potentiometer off. Reading on
multimeter should indicate 0 OHM.
Two Pin Connector
Check potentiometer is in OFF
position.
Set multimeter to continuity, connect
multimeter leads to
potentiometer leads.
potentiometer to the on position, the
multimeter's audible alarm should
now be sounding to indicate
continuity.
Does
the main burner
light ?
NO
Is
"Burner On"
light on ?
NO
Are live &
neutral reversed ?
Indicator light inside
box will be lit
Check pilot flame
for correct size
the
Check & clean
electrode. Check spark
gap. Check electrode
lead
Check there is
20mbar gas pressure
at the inlet to gas valve
Replace PCB
both
Turn
11.0 Fault Finding
Does
the boiler shut
down when the water
flow reaches
80-84 o C ?
NO
YES
Check there is
20mbar gas pressure
at the inlet to gas valve
Is
there the
correct burner
pressure at the test
point ?
YES
Check main injector
is not blocked
YES
Check pilot injector is
not blocked
YES
Check pilot flame
size
YES
Check pilot hood
position and pilot
air flow
YES
Check continuity
across mains solenoid
(5 K OHM)
NO
Change gas valve
Warning
It is important that both the air and flue ducts are
cut to their correct lengths also ensure that the
flue duct is fully engaged.
Failure to comply with the recommended fitting
instructions will adversly affect the operation of
the appliance.
YES
Does
pump run
on ?
YES
Boiler satisfactory
Replace sensor
Check
Potentiometer
(see table)
Replace PCB
NO
Set pressure
regulator
YES
Change PCB
43