Fault Finding
62
12 Fault Finding
Note 1 - Is there a permanent mains
live supply connected to the
hopper/boiler?
Check that the permanent live from the
fused spur is correctly connected to
terminal L1 on the 4-way plug at the
rear of the hopper. Also check that 4-
way plug is fully pushed into the socket
on the flying lead, at the rear of the
hopper. Refer to Sections 8.4 and 8.5
for further details.
Also check that 5-way plug from
hopper is fully pushed into the socket at
the top left rear of the boiler.
Check that the fused spur is switched
ON and, if necessary, check the fuse
is OK.
Note 2 - Is there a permanent mains
live supply connected to the burner?
Check that the two 7-way plugs are
fully pushed into the two lower sockets
on the left side of the burner.
Also check for permanent live on
terminal L1 of burner plug No.1. Refer
to Figure 8-5.
Note 3 – Has the boiler overheat
thermostat tripped?
Unscrew and remove the black cover
from the overheat reset button on the
boiler control panel to check if boiler
overheat thermostat has tripped. If YES,
go to Section 12.4 for further guidance.
Note 4 – Has the pellet feed tube
thermostat tripped?
Remove the steel retaining clip and
disconnect the lead from the pellet feed
tube (burn back) thermostat. Check the
reset button to see if thermostat has
tripped. if YES, go to Section 12.5 for
further guidance.
Note 5 - Is the combustion chamber
door closed and catch fully
engaged?
The combustion chamber door is fitted
with a safety interlock. Once the door
catch is disengaged all power to the
burner is interrupted. Refer to Section
10.5.2. Check that catch is FULLY
engaged when door is closed.
Note 6 - Is the door micro-switch
operational?
Check electrical continuity of door
micro-switch. Replace if faulty. Refer to
Figure 8-5 and 12-4.
12.3 No Screen Display - Boiler will not fire – blank screen
Primary Fault
Secondary follow on checks
BLANK DISPLAY SCREEN
Is electrical
supply switched
on? Is there
power to terminal
L1 on 4-way plug
at rear of hopper?
Yes
No Yes Yes No No
No
No No
Are all plugs
correctly fitted?
i.e. the three
burner plugs & the
plug from hopper
to the boiler?
Has the boiler
overheat stat
tripped?
Unscrew black
cover on control
panel and check
Has the pellet
feed tube stat
tripped? Unclip
& remove lead
from stat and
check
Is the
combustion
chamber door
closed & the
door catch fully
engaged?
Is the power
to terminal L1
of burner plug
No.1?
Check continuity
of burner fuse
on PCB.
Is it OK?
Is the ribbon
cable fitted
correctly to PCB
and back of
display?
Replace burner
PCB does this
rectify the
problem?
Correctly fit
all plugs –
push fully into
sockets
Go to the
‘BOILER
OVERHEAT
STAT’ fault
finding chart
Go to the
‘PELLET TUBE
STAT’ fault
finding chart
Close door &
fully engage
door catch
Is door catch
microswitch
Operational?
Replace
faulty door
microswitch?
Replace burner
fuse
Correctly fit
ribbon cable at
both ends
Correctly fit
ribbon cable at
both ends
Yes No
No
Note 1 Note 3Note 2 Note 4 Note 5
Note 5
No No Yes Yes Ye s
Check electrical
supply to
hopper/boiler
& rectify as
necessary
No
Figure 12-5: Location of door
micro-switch
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