19
b
Shut-off mode
h
Forced full load.
l
Forced part load.
Table 04 Operating codes
6.4 Shut-off mode (
bXX
)
During shut-off mode condition the code-display will show a
b
, whilst the
t
-display
indicates the cause with two flashing dots.
Table below details cause of shut-off mode.
Code
Description
B@%
Maximum acceptable flow temperature rise exceeded. The boiler will shut
off for ten minutes, then restart. Should the flow temperature conditions
remain the same after 5 attempts, this code will be recorded as a shut-
down failure. Boiler will not lockout.
b@^
Contacts of the external interlock have opened during heat demand. The
boiler will shut off for 120 seconds. Should the contacts close again during
heat demand, the boiler will wait the remaining time from the 120 seconds
before attempting a restart.
B@*
Internal check on fan speed. After 5 attempts, the boiler will lockout. This
code will be recorded.
B@(
Internal check on fan speed. After 5 attempts, the boiler will lockout. This
code will be recorded.
B#)
Maximum temperature difference between flow and return exceeded. The
boiler will shut off for 150 seconds, then restart. Should the temperature
difference conditions remain the same after 10 attempts, this code will be
recorded as a shut-down failure. Boiler will not lockout.
B$#
One or several adjusted parameters out of range including some
factory defaults which should not have been changed. Check and reset
parameters:
- press the ‘
reset’
-key imidiately followed by pressing the ‘
m
’-key for
about 12 sec.,
-
‘code’
- display shows
P
,
- use
[
+
] and [
-
]-keys to enter correct boiler parameter (
P
=
80
),
- press
‘
e
’-key to confirm settings,
- check parameter settings and change were needed or disired.
Table 05 Shut-off codes
