55
0*
Setting failure
- check
parameter
D
(second digit must be
0
)
1!
Failure of internal
communication
bus
- short circuit in flat cable: replace flat cable
- water/condensation on display
- possibly external EMC contamination
1*
Flow temperature
too high
Check:
- the
waterflow,
ref. Par. 7.4.7.
- system for trapped air
- sensors for resistance at set temperature,
see graph
in Fig. 22.
- if the boiler is full of water (min. pressure 0.8 bar)
1(
Return tempera-
ture too high
2$
Return temp >
flow temp
- Flow sensor badly installed
- Pump operating in wrong direction or flow and return
connections crossed
2*
Fan not running
- Fan or motor failed
- Supply and/or signal control cable – poor connecti-
ons or failed.
2(
Fan runs conti-
nuously or speed
signal not correct
- Check control cable connections and for continuity
- Fan
defective
- Flue draft conditions too high
3!
Temperature
sensor failure
Flow temperature sensor short circuit
3@
Return temperature sensor short short circuit
3$
Outside temperature sensor short short circuit
3^
Flow temperature sensor not connected or open circuit
3&
Return temperature sensor not connected or open cir-
cuit
4)
Setting failure
check parameter
D
(first digit must be
0
)
7&
Ionisation failure
during boiler
operation
After 4 restarts during 1 heat demand
- flue gas recirculation (internal/external)
- insufficient air flow – check fan or air inlet/flue outlet
for obstruction
- incorrect
combustion.
Other
Codes
Control box
failure
Fault-codes:
3
,
6
,
7
,
10
,
13
,
14
,
15
,
16
,
17
,
41
,
42
,
44
and
60
:
- Press
the
‘reset’
-key
- When fault returns, check wiring for short circuits
- When faults still return, replace the control box
Shut-off codes:
B@%
,
B@*
,
B@(
,
b#)
or
b$#
,
see Par. 6.4.
Table 18 Faultcodes
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