Fault Finding - Baxi TS Super Installation And Servicing Instructions

Before starting Fault Finding carry out
preliminary electrical system checks i.e.
Earth Continuity, Polarity, Short Circuit and
Resistance to Earth.
Does
the pilot
START
light ?
NO
Has
Was
YES
YES
On/Off button On/Off
held for
neon
3-4 seconds
illuminated
?
NO
NO
Restart ignition
sequence
there power
to the
appliance
NO
Check power
supply
Did
Is there
YES
ignition
a spark at
sequence
electrode ?
start ?
NO
NO
Fault on
spark gap
control system
(2.5-4mm) ?
YES
Did
Check electrode
motorised valve
lead and
make noise ?
insulation
NO
YES
Change motorised
gas valve
Do
YES
illumination
bulbs light ?
NO
Change
transformer
assembly
YES
Check connection
on switch at board
?
Turn on
gas supply
NO
Is
Is
gas supply
turned
on ?
?
YES
Is
meter
YES
pressure
correct ?
YES
(20mb)
NO
Consult the
Gas Supplier
Is
Correct
NO
spark gap
(see diagram)
Change
control box
11.0
Does
the main
burner
light ?
NO
NO Are
Open
gas cocks
gas cocks fully open ?
YES
NO
Contact the
Gas Supplier
Is
meter pressure
correct ?
Clean
pilot burner
YES
NO
Is
NO pilot flame
stable and approx
Is
20mm long
pilot burner
?
clean ?
YES
Is
thermocouple
YES
tip clean ?
Pilot supply
YES
blocked -
replace gas valve
Is
thermocouple
tip sound ?
YES
Are
thermocouple
connections
sound ?
YES
Is
NO
thermocouple
Change
output correct ?
pilot assembly
(6.5-10mV)
2.5 - 4mm
Pilot/A.S.D.
Assembly

Fault finding

Does
YES
YES Does
illumination
the fire modulate
effect work ?
high to low ?
NO
NO
Is neon
operating from
high to low ?
Does
one bulb light ?
NO
Fault on
control system
NO
Is
there 11V
Change
NO
at bulb spade
transformer
connections ?
assembly
YES
Change
NO
Clean
illumination
thermocouple tip
P.C.B.
NO
Change
pilot assembly
NO
Make good
the connection
NO
Change the
control box
Is flue
YES
YES
blocked causing
Rectify flue
A.S.D. to
operate ?
YES
Fire
operating
satisfactorily
YES
Change bulb
27