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Lock-
Error
out
code
17
Stack Error
18
Instruction Error
19
Ion Check Failed
20
Flame Out Too Late
Error
21
Flame Before Igni-
tion
22
Too Many Flame
Failures
23
Corrupted Error
Number
27
Filling Too Much
28
Fill Time Error
29
PSM Error
30
Register Error
32
T. Exchange Diff
Error
33
LWCO/Air intake
block
34
LWCO 2 Error
35
Air Switch Not
Closed
36
Gas Pressure Error
Description
Internal software error
Internal software error
Internal software error
Flame still present 10
seconds after closing the
gas valve
Flame is detected before
ignition
Three time flame lost
during 1 demand
Error code RAM byte was
corrupted to an unknown
error code.
Too many automated fill-
ing attempts in a short
time
period
Filling takes too long
Internal software error
Internal software error
The 2
nd
exchange sensors
deviate too much for
more than 60 seconds
Low water cut off 1 error
Low water cut off 2 error
Air pressure switch not
closing during post-purge
1
Gas pressure switch open
for more than
E2_GPS_Timeout
E93.1804.014
Cause
wrongly programmed
BCU or PB
wrongly programmed
BCU or PB
wrongly programmed
BCU or PB
wrong earthing of BCU
and boiler
wrong earthing of BCU
and boiler
bad gas supply or CO2
level is not correct or bad
ignition rod
wrongly programmed
BCU or PB
If output is programmed
as filing valve and there
are to many filing at-
tempts
If output is programmed
as filing valve and filling
takes more than 10
minutes
wrongly programmed
BCU or PB
wrongly programmed
BCU or PB
There is not enough wa-
ter flow through the heat
exchanger
There is no water in the
heat exchanger or not
electrically connected
There is no water in the
heat exchanger or not
electrically connected
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 con-
nected to the air intake
pipe or water in hose
wrong gas pressure on
gas supply, loose wiring
on connections terminal.
Solving
reset BCU or replace BCU and /
or display unit
reset BCU or replace BCU and /
or display unit
reset BCU or replace BCU and /
or display unit
Check earthing of BCU and boiler
Check earthing of BCU and boiler
check gas supply pressure, check
CO2 level and adjust if neces-
sary, replace ignition rod or re-
place
ignition cable.
reset BCU or replace BCU and or
display unit
Check if there is a leak in the
central heating system or if the
boiler it self is leaking also check
expansion
vessel on internal leak
Check if there is a leak in the
central heating system or if the
boiler it self is leaking also check
expansion
vessel on internal leak
reset BCU or replace BCU and /
or display unit
reset BCU or replace BCU and /
or display unit
Check if the general pump is run-
ning and if all valves are open to
make enough flow
Check if there is enough water in
the heat exchanger if not so fill
up the system
Check if there is enough water in
the heat exchanger if not so fill
up the system
Check if there are any obstruc-
tions in the flue or air intake, re-
place APS if jammed, connect air
hose to the air intake pipe, re-
move any water from the hose.
Check if gas pressure is in limits
of the gas pressure switch.
Check wire bridge 24-25 at low
voltage
connection terminal
97
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