E93.1801EN171 HWB installation manual
89
Lock-
out
code
Error
Description
Cause
Solving
16
FLUE_GAS_
ERROR
Flue temperature ex-
ceeded the maximum
flue temperature
There is no water in
the heat exchanger or
flue gas sensor is mal-
functioning or heat ex-
changer is overheated.
Check if flue sensor is work-
ing correctly if not so replace
flue sensor. Check waterflow
if to low increase waterflow.
17
STACK_ER-
ROR
Internal software error
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
18
INSTRUC-
TION_ ERROR
Internal software error
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
19
ION_CHECK_
FAILED
Internal software error
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
20
FLAME_OUT_
TOO_LATE
Flame still present 10
seconds after closing
the gas valve
wrong earthing of BCU
and boiler
Check earthing of BCU and
boiler
21
FLAME_BE-
FORE_IGNIT
Flame is detected be-
fore ignition
wrong earthing of BCU
and boiler
Check earthing of BCU and
boiler
22
TOO_MANY_
FLAME_LOSS
Three time flame lost
during 1 demand
bad gas supply or CO2
level is not correct or
bad ignition rod
check gas supply pressure,
check CO2 level and adjust if
necessary, replace ignition
rod or replace ignition cable.
23
CORRUPTED_
ERROR_NR
Error code RAM byte
was corrupted to an un-
known error code.
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
27
FILLING_TOO_
MUCH
Too many automated
filling attempts in a short
time period
If output is pro-
grammed as filing
valve and there are too
many filing attempts
Check if there is a leak in the
central heating system or if
the boiler itself is leaking also
check expansion vessel on
internal leak
28
FILL_TIME_
ERROR
Filling takes too long
If output is pro-
grammed as filing
valve and filling takes
more than 10 minutes
Check if there is a leak in the
central heating system or if
the boiler itself is leaking also
check expansion vessel on
internal leak
29
PSM_ERROR
Internal software error
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
30
REGISTER_
ERROR
Internal software error
wrongly programmed
BCU or PB
reset BCU or replace BCU
and or display unit
32
T_EX-
CHANGE_
DIFF_ERROR
The 2 exchange sensors
deviate too much for
more than 60 seconds
There is not enough
water flow through the
heat exchanger
Check if the general pump is
running and if all valves are
open to make enough flow
33
LWCO_1_
ERROR
Low water cut off 1 error
There is no water in
the heat exchanger or
not electrically con-
nected
Check if there is enough wa-
ter in the heat exchanger if
not so fill up the system
34
LWCO_2_
ERROR
Low water cut off 2 error
There is no water in
the heat exchanger or
not electrically con-
nected
Check if there is enough wa-
ter in the heat exchanger if
not so fill up the system
35
APS_NOT_CL
OSED_IN_POS
T_PURGE
Air pressure switch not
closing during post-
purge 1
no air transport to the
burner after heat de-
mand; flue or air inlet
is blocked, or APS is
jammed or air signal
hose not connected to
the air intake pipe or
water in hose
Check if there are any ob-
structions in the flue or air in-
take, replace APS if jammed,
connect air hose to the air in-
take pipe, remove any water
from the hose.
36
GAS_PRES-
SURE_ERROR
Gas pressure switch
open for more than
E2_GPS_Timeout
wrong gas pressure on
gas supply
Check if gas pressure is in
limits of the gas pressure
switch.
Содержание HWB-299
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