FAULT FINDING & DIAGNOSIS
6 720 815 725 (2015/05)
55
7.3
CENTRAL HEATING FUNCTION
POWER
SWITCH
ON
BLUE
LIGHT
ON
GREEN
FLAME
LIGHT
ON
END OF
BOILER
DEMAND
CENTRAL
HEA
T
ING
DEMAND
LOCKOUT
BURNER
LIT?
IGNITION SEQUENCE
IGNITION
SEQUENCE
(see details)
YES
YES
NO
NO
Burner restarts after
anticycle time (3 minutes)
has expired and water
temperature is
< CH setpoint by 10K
Diverter V
alue
in CH position
pump ON.
Gas value OFF
.
Fan overrun
30 seconds
Over temperature
shut-down if water
temperature exceeds
set value
(CH setpoint).
90 seconds
stabilisation
period.
Gas value
OFF
Pump run 3
minutes
Fan run 30
seconds.
Fan (& gas)
modulation
to achieve
set
temperature
(35-88
0
C)
Fan to
start
speed.
Spark
ignition
4 seconds
5th
attempt?
Stop spark.
wait
10 seconds
Room
thermostst and/or
mains
programmer ON
(or link fitted at
ST10)
AND
Facia mounted
programmer (if
fitted) ON
AND
CH control knob
ON
6720647361-59.2Wo