Glow-worm BBU 45/4 - Manual (Page 26)

26 2000225023C
9 Fault Finding
Diagram 9.1
9605
9.1 Electrical
Carry out the preliminary electrical system checks as
contained in a multimeter instruction book.
NOTE. If the electrical supply is switched rapidly off and on
without gas present the control will purge for 100 sec. Neither
of the indicators will be lit. The appliance will then operate
correctly.
Is there 230v ac
across Blue and
Brown at
(Connector X1)
Is fuse blown
on spur
Check plug
connection & wiring
Does spark start
after 5 seconds
Check ignition
lead connection
Remake
connection
Check thermistor
is not open circuit
Check PCB
fuse
Is O/H link
circuit open
Check that there is
200V dc between
Blue & Brown
(Connector X2)
Does the pilot
light
Replace PCB
Replace fuse
Replace thermistor
Replace PCB
Replace Gas Valve
Does detection
occur prior to
Lockout
Check polarity
of supply
Are ignition & sense
correctly connected
at the pilot
Replace Gas valve
Replace PCB
Check that there is
100V dc between
Blue & Black
(Connector X2)
Does the Main
burner light
Replace PCB
System operating
satisfactorally
No
Yes
No No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No No
No No
Yes
No
Yes