46
Lockouts
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In case of a lockout, a warning symbol
( )
and a flashing error code appears on the display. The cause of a fault should first
be determined and eliminated before the boiler is being reset. The table below shows all possible lockouts with indication of
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indication of possible cause
"ERROR CODE"
DESCRIPTION OF ERROR
CAUSE
10
Outside sensor fault
Outside sensor fault (B9) (room model,
plant frost protection, sensor value not plau-
sible)
20
Boiler temperature 1 sensor fault
Short-circuit boiler flow sensor (B2)
Open-circuit boiler flow sensor (B2)
26
Common flow temperature sensor fault
Common flow temperature sensor fault
(B10) (sensor missing, double configured,
configured on slave, …)
28
Flue gas temperature sensor fault
Open-circuit flue gas sensor
Short-circuit flue 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-
tion
BSB-Wire short-circuit or no communica-
tion
84
BSB-Wire address collision
BSB-Wire address collision
85
BSB radio communication fault
BSB radio communication fault
91
Data loss in EEPROM
Data loss EEPROM
100
Two clock time masters
Two clock time 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 tempe Sd_RL_gro-
esser_VL - 2K)
Delta-T too high
Boiler temperature rises faster than allowed
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 flame in operation
Repetition error counter exceeded
Loss of flame in operation
130
Flue gas temperature max. limit exceeded
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132
Gas pressure switch safety shut-down
Interlock, input interrupted
Gas pressure switch is open