- FAULT/ERROR
FINDING
Several checks are included
to
protect the boiler
and
its
environment.
In
case
of
error condition,
the
error
is
displayed
by
the
alarm
LED's
on
the display
panel
(Table
9)
and
heat
demands
will
be
disabled.
+
Error
conditions
can
be
divided
in 2 groups: lockout conditions
and
blocking
conditions.
a) Lockout conditions, flame failure lockout, high limit lockout
and
APS
error,
can
only
be
cleared
by
keeping the reset push-button for 2 sees., then
main
board
and
display
panel
will
be
in
stand-by
mode.
If the
problem
continues,
call
qualified
service.
b) Blocking conditions,
CH
NTC
error (short circuit or
open
circuit),
DHW
NTC
error (short circuit
or
open
circuit),
TTB
error
and
low water pressure, will reset as soon as the cause
of
the
problem
disappears.
For
example,
when
CH
sensor
is
out
of
operating
range,
blocking
condition will
be
generated
and
keep
the
system off until
the
sensor
is
within
operating
range
again
Table 9
L3(i)
L4~
L6~
L71Dffi
Communication error
Fast
Fast
Fast
Fast
Blink Blink Blink Blink
Flame failure lock-out
OFF
ON
OFF OFF
CH
NTC
(short
circuit I open circuit) error
Fast
ON
OFF OFF
Blink
DHW
NTC
(short
circuit I open circuit) error
Fast
OFF
ON Blink
OFF
High limit lockout (over-temperature)
OFF
Fast
OFF OFF
Blink
TTB
error
(in
open flued operation)
OFF
ON
OFF
Fast
Blink
APS
error
(in
room sealed operation)
OFF
ON
OFF
Fast
Blink
Low
water pressure
OFF
ON
Fast
Fast
Blink Blink
Other microcontroller (main board)
errors
ON
Fast
ON ON
Blink
35
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