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Lockouts
GB
43
In case of a lockout, a warning symbol
( ) and a ashing error code
appears on the display. The cause
of a fault should rst be determined
and eliminated before the boiler is
being reset. The table below shows
all possible lockouts with indica on
of possible cause.
ERR.
CODE
DESCRIPTION OF ERROR CAUSE
10 Outside sensor fault
Outside sensor fault (B9) (room model,
plant frost protec on, sensor value not
plausible)
20
Boiler temperature 1 sensor
fault
Short-circuit boiler ow sensor (B2)
Open-circuit boiler ow sensor (B2)
26
Common ow temperature
sensor fault
Common ow temperature sensor fault
(B10) (sensor missing, double con g-
ured, con gured on slave, …)
28
Flue gas temperature sensor
fault
Open-circuit ue gas sensor
Short-circuit ue gas sensor
40
Return temperature 1 sensor
fault
Short-circuit boiler return sensor (B7)
Open-circuit boiler return sensor (B7)
50
DHW temperature sensor/
thermostat 1 fault
DHW temperature sensor/thermostat 1
fault (B3)
52
DHW temperature sensor/
thermostat 2 fault
DHW temperature sensor/thermostat 2
fault (B31)
78 Water pressure sensor fault
water pressure sensor fault (short- or
open-circuit)
81
LPB short-circuit or no bus
power supply
LPB short-circuit or no bus power supply
82 LPB address collision LPB address collision
83
BSB-Wire short-circuit or no
communica on
BSB-Wire short-circuit or no communi-
ca on
84 BSB-Wire address collision BSB-Wire address collision
85
BSB radio communica on
fault
BSB radio communica on fault
91 Data loss in EEPROM Data loss EEPROM
100 Two clock me masters Two clock me masters
105 Maintenance message Maintenance message
110 SLT lock-out
SLT-temperature exceeded
open TL/SLT causes lockout
Boiler return temperature is higher
than/equal to (boiler temperature + Sd_
RL_groesser_VL - 2K)
Delta-T too high
Boiler temperature rises faster than al-
lowed in TempGradMax
111
Temp limiter safety shut-
down
Temp limiter safety shut-down
119
Water pressure switch has
cut out
Thermostat burner door
128 Loss of ame in opera on
Repe on error counter exceeded
Loss of ame in opera on
130
Flue gas temperature max.
limit exceeded
Flue gas temperature 90˚ C
41


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