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16.2 Shut-off codes per boiler module
Code
Description
Insufficient air transport during pre-ventilation.
The boiler module is locked after 5 restarts (6 starts) with
b
)*
code 08 (see section 14.4).
T
is higher than T
return
more than 10 minutes (and the boiler module has been run-
b
@$
ning at minimum load for 10 minutes).The shut-off is lifted
when T
is less than or equal to T
return
Maximum acceptable ascension speed of the boiler block
temperature has been exceeded. The boiler module shuts
down for 10 minutes, after 5 consecutive start attempts within
b
@%
one heat demand command the shut-off is recorded in the
failure register as a fault, the boiler module does not lock out/
go into failure mode.
If minimum gas pressure switch LD is connected (optional):
minimum gas pressure undershot. The shut-off is lifted when
b
@^
the gas pressure returns.
@8 Fan not running
b
@9 Fan continues to run or signal incorrect
b
Maximum acceptable difference between flow and return tem-
perature has been exceeded. The boiler module shuts down
for 150 seconds, after 20 consecutive start attempts within
b
#)
one heat demand command the shut-off is recorded in the
failure register as a fault, the boiler module does not lock out/
go into failure mode.
Air pressure differential sensor short circuited; after 4 restarts
b
38
the shut-off goes into failure mode
Air pressure differential sensor open; after 4 restarts the shut-
b
39
off goes into failure mode
$# One or more parameters are out of limits.
b
$5 Hydraulic pressure sensor short circuited
b
+ 2° (e.g. 93°, if T
flow
return
+ 3°, e.g. 92°.
flow
55
Cause/Check
- Air supply or flue gas discharge for
blockages/ installation faults
- Air pressure differential switch and
connections.
- Siphon is blocked
- Non return valve is stuck
- Flow and return sensors have been
is 90°) for
swapped
- Flow and return pipes have been
swapped.
- Whether heating pump is running
- The water flow through the boiler
module
- Water pressure.
- Gas supply (is gas valve open?)
- Is switch set correctly?
- Wiring.
- Fan defective
- Fan cable or connector is corroded,
resulting in absence of voltage or
control signal
- Check the fan cable connectors on
both the fan side and the automatic
control unit side
- Fan electronics defective
- High natural draught
- Whether the heating pump is operat-
ing
- The water flow through the boiler
module
- Water pressure
- Check the connecting cable of the
air pressure differential sensor
- The air pressure differential sensor
is defective or not connected
- Check the air pressure differential
sensor connecting cable for short-
circuiting, etc.
- Air pressure differential sensor is
defective
The parameters in the memory of the
control unit are incorrect.
- Check the hydraulic pressure sensor
connecting cable for short-circuiting,
etc.
- Hydraulic pressure sensor is defec-
tive
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