Fault Finding
71
12.9 Air Pressure Error
Note 1 - Does fault occur during
lighting sequence?
During the ‘PRE-LOAD’ operation, the
burner controls check that burner fan is
generating enough air pressure to close
the air pressure switch. If the pressure
switch is not closed during pre-load,
then the warning ‘AIR PRESSURE
ERROR’ is displayed on the burner
screen.
Note 2 - Is the burner fan
operational?
During the ’PELLET BURNER FIRING’
operation the burner controls checks
that the burner fan speed is correct. It
does not check if the fan is generating
enough air pressure. If during the
’PELLET BURNER FIRING’ operation
the burner fan speed is not correct then
the warning ‘AIR PRESSURE ERROR’
is displayed on the burner screen.
Check that the fan inlet is not blocked
and that the fan blades are free to
rotate. If necessary, thoroughly clean
and remove any dust or debris. If fan
still does not rotate freely, replace fan.
Note 3 - Is the air pressure switch
operational?
Check that air supply tube is correctly
connected to the pressure switch and
not blocked or twisted. Refer to Figure
12-6. Rectify as necessary. Check
condition of tube and replace if
damaged. Check operation of air
pressure switch.
Note 4 - Is fan air pressure tube OK?
Check that the plastic tube from the fan
is not twisted, kinked or blocked.
Check that it is correctly connected to
the both the fan and pressure switch
(lower of the two connections on the
pressure switch).
Note 5 - Is burner fan pressure
correct?
Using a digital manometer (set for
positive pressure) check the pressure
generated by the burner fan is the
minimum of 0.8mbar required to
activate the air pressure switch. Refer
to Figure 12-7. If fan pressure is
incorrect, replace fan.
If correct pressure is still not achieved,
replace burner PCB.
Figure 12-6: Air pressure switch & fan Figure 12-7: Checking air pressure
from fan
Primary Fault
Secondary follow on checks
AIR PRESSURE ERROR
Reset error
by pressing the
‘RESET’ button
on burner control
panel
No
No No Yes No No
Restart the
boiler does the
fault occur during
the lighting
sequence?
Is the burner fan
operational?
Is the fan
blocked?
Is air
pressure switch
operational?
Is the burner
fan pressure
correct?
Check plug
connections
between the
burner fan &
control PCB
Remove any
blockage or replace
fan if necessary
Check operation
of pressure
switch
Is fan air pressure
tube OK?
Replace burner
fan. Is burner
fan pressure
now correct?
Yes Yes
Note 1 Note 2 Note 3 Note 4 Note 5
No Yes
Replace
control PCB
No
Yes
H2o 60˚C
SET 80˚C
AIR PRESS
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