Bosch SSB800 SA Installation And Service Instructions For Contractors page 48

48 | TROUBLESHOOTING TABLE
Error no . Error
147 T_EXCHANGE2_CLOSED
148 T_SELECTION1_CLOSED
149 T_SELECTION2_CLOSED
150 T_SELECTION3_CLOSED
151 T_OPTIONAL1_CLOSED
152 T_OPTIONAL2_CLOSED
153 T_AMBIENT_CLOSED
154 WD_CONFIG_ERROR
155 FLUE_PRESSURE_ERROR Flue pressure switch is closed
T_SECONDARY_SUPPLY_
157
OPEN
T_SECONDARY_RETURN_
158
OPEN
T_SECONDARY_SUPPLY_
159
CLOSED
T_SECONDARY_RETURN_
160
CLOSED
161 FILL_WARNING
162 FLUE_BLOCKED
LOWEXFLOW_
163
PROTECTION
Warnings
Error no . Error
CC_LOSS_
200
COMMUNICATION
201 CC_LOSS_BOILER_COMM
202 OUTDOOR_WRONG
203 T_SYSTEM_WRONG
204 T_CASCADE_WRONG
6720866942 (2018/06) US
Description
Exchange 2 sensor shorted
Selection 1 sensor shorted
Selection 2 sensor shorted
Selection 3 sensor shorted
Optional 1 sensor shorted
Optional 2 sensor shorted
Ambient sensor shorted
Watchdog fan configuration setting
error
Secondary circuit supply sensor open
Secondary circuit return sensor open
Secondary circuit supply sensor
shorted
Secondary circuit return sensor
shorted
Pressure is too low, demand has
stopped but no error needed to be
stored at this time
Flue is blocked, demand needs to be
stopped with fan at ignition speed
but no error needed to be stored at
this time
Flow is too low, demand needs to be
stopped with fan at ignition speed
but no error needed to be stored at
this time
Description
Cascade System: Leading burner
lost communication with one of the
depending burners
Cascade System: Leading boiler
lost communication with one of the
depending boilers
Outdoor sensor is open or shorted
T_System sensor is open or shorted
T_Cascade sensor is open or
shorted
Checks
a- Check for any obstruction in
the exhaust system;
b- Check the condensate
discharge.
Checks
Solutions
a- Remove any obstructions from
the exhaust system;
b- Remove any obstruction from
condensate discharge and verify if
the condensate can flow freely.
Solutions
SSB