82
Note 1 - Is the cursor next to the
thermostat symbol on the burner
display?
When there is a switched live supply
to the burner (i.e. when the heating
system controls are ‘calling’ and the
ON/STANDBY switch is set to ON), the
burner screen display shows a cursor
highlighted next to the boiler thermostat
symbol. Refer to Figure 12-4.
Note 2 - Is the boiler above set
point less the ‘DELTA RESTART’
temperature?
If the boiler has exceeded the ‘TEMP
OF H2o’ setting (80°C) the boiler will
shut down. The boiler temperature will
have to fall to below the set point less
the ‘DELTA RESTART’ (5°C below the
boiler set point temperature) before it
can start again. Refer to Section 9.1.
Note 3 - Is there a sufficient quantity
of pellets in the pellet hopper?
The effect of insufficient pellets will
depend on the type of pellet storage
used, as follows:
Using a pellet hopper only – (with
toggle switch set to ‘HOPPER ONLY’)
if there are insufficient pellets, the
hopper contents switch will break the
switched live to the boiler, causing
‘WAIT BOILER THERMOSTAT’ to be
displayed. Refill the hopper to start the
boiler. Refer to Section 1.4.4 for further
details.
Using a bulk pellet store – (with
toggle switch set to ‘BULK STORE’)
the hopper contents switch will control
the operation of either the bulk store
auger or Grant SpiraVac system.
When used with a bulk store auger
it will NOT interrupt the switched live
to the boiler and thus ‘WAIT BOILER
THERMOSTAT’ will NOT be displayed.
The boiler will continue to operate until
ALL pellets in the hopper are used
and then stop, with ‘FAILED PELLET
LIGHTING’ displayed on the burner
control screen.
In this case, check that:
Primary Fault
Secondary follow on checks
• there are pellets in the bulk store
• the bulk store auger, or Grant
SpiraVac system, is operating
correctly (refer to instructions
supplied with the SpiraVac system).
Rectify as necessary.
When used with a Grant SpiraVac refer
to instructions supplied with unit.
Note 4 - Is there a switched live
from the heating system controls
connected to the hopper/boiler?
Check that switched live from the
controls is correctly connected to
terminal L2 on the 4-way plug at the
rear of the hopper. Also check that
this 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.
Check that ALL controls (programmer
and room thermostats) are ‘calling’ and
that there is a 230V output to the boiler.
Note 5 - Is there continuity between
terminals T1 and T2 on burner plug
No.2?
Disconnect the plug from left side of
burner and check for continuity between
terminals T1 and T2. Refer to Figure 8-5
for wiring details.
12.2 Normal Screen Display - Boiler will not fire – but NO error message is displayed
Figure 12-4: Burner screen display
WAIT BOILER THERMOSTAT
Is the cursor next
to the thermostat
symbol on the
burner display?
No
No No No No No No No
Is the burner
‘ON/STANDBY’
switch set to
‘ON’ position?
Is there a
sufficient quantity
of pellets in the
pellet hopper?
Are the heating
system controls
(Programmer,
Room Stat)
‘CALLING’ for
heat?
Is there power
to terminal L2
on 4-way plug
at rear of
hopper?
Is there
continiuty
between
terminals T1 and
T2 on burner
plug No2?
Is there power
across the
boiler ‘ON/OFF’
switch?
Is there power
at relay (in boiler
control panel)
on Terminals 21
and 24 when coil
is energised?
Set burner
‘ON/STANDBY’
switch to ‘ON’
Fill hopper with
correct grade of
pellets
Set system
controls to call
for heat
Check the
switched live
supply to hopper/
boiler and rectify
as necessary
Check plug is
correctly fitted
Replace faulty
switch
Replace faulty
relay
Yes Yes
Yes
Yes
Note 1 Note 3 Note 4 Note 5
Note 2
Yes Yes Yes Yes
Is H2o Temp
higher than the
set point minus
the Delta restart
temperature?
NO FAULT!
Boiler is waiting
for system temp
to drop
H2o 60˚C
SET 75˚C
WAIT BOILE
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