2146
12
GB
OPERATING FAULTS
Burner lock-out due to
: – Earth probe
– Air pressure switch opening
Burner shut down due to : – Gas pressure switch opening.
T h e bu r n e r l o ck s o u t
d u r i n g t h e p r e p u r g e
phase.
The air pressure switch does not
change over to the operational posi-
tion.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is
bad adjusted).
The flame exists.
Faulty valves: replace them.
The pressure test point (11, fig. 9,
page 8) is badly positioned.
Place it in the right position according to
the instructions of this manual on page
8, chapter 4.2.
The burner continues to
repeat the starting cycle
without going on lock-
out.
The gas pressure in the gas-mains
lies very close to the value to which
the gas pressure switch has been set.
The sudden falling-off pressure at the
opening of the valve causes the
opening of the pressure switch.
H o w e v e r t h i s o n l y t e m p o r a r i l y ,
b e c a u s e t h e v a l v e i m m e d i a t e l y
closes again, so then does the pres-
sure switch, because the pressure
builds-up again, causing the cycle
to be repeated over and over.
Lower and set the pressure switch.
FAULTS
POSSIBLE CAUSES
SOLUTION
