Blocking Errors - Bosch SSB255 Installation And Service Manual

42 | Troubleshooting
Error
"Too Many Flame Failures"
"Flow Switch Not Closed Error"
"Flow Switch Not Open Error"
"Flag Byte Integrity Error"
"Ad Hi Cpl Error"
"Ad Lo Cpl Error"
"Register Error"
Tab. 18 Lockout codes
6 .1 .2

Blocking errors

If it is "Blocking" error the boiler will go back to normal operation, with no need to press the "RESET" button, once the reason for the failure has been
eliminated.
In the following table the "Blocking" errors are listed:
Error
"WD Error Ram"
"WD Error Rom"
"WD Error Stack"
"WD Error Register"
"WD Error Xrl"
"Refhi Too Lo Error"
"Refhi Too Hi Error"
"Reflo Too Lo Error"
"Reflo Too Hi Error"
"Flame Error 2"
"Water Level Detect"
"Water Level Meas"
"Low Water Cutoff Error"
"Low Water Pressure Error"
"Low Water Pressure Sensor"
"Flue Gas Error"
"Return Temp Error"
"Blocked Drain Error"
"Wd Freq Error"
"Phase Error"
"Net Freq Error"
"Faulty Earth Error"
"WD Communication Error"
Tab. 19 Blocking errors
6720818454 (2016/02) US
Int . nr . Description
Three times flame lost during one
31
demand
32 Flow switch not working / No flow
33 Flow switch not working / No flow
34 Internal software error
35 Internal software error
36 Internal software error
37 Internal software error
Int . nr . Description
45 Internal software error
46 Internal software error
47 Internal software error
48 Internal software error
49 Internal software error
50 Internal software error
51 Internal software error
52 Internal software error
53 Internal software error
Flame is detected in a state in which no
54
flame is allowed to be seen
55 Low water level detected
56 Low water level measurement error
57 Low water sensor error
58 Low water pressure error
59 Low water pressure
60 Flue gas pressure error
Return temperature is higher than stay
61
burning temperature
62 Block drain switch is active
Incorrect Frequency signal or no
64
communication with the WD
65 Hot neutral reversed
66 Net freq. error detected in the main
67 Faulty earth connection
68 Watchdog communication error
Checks
a- Check the integrity of
the wire connections of the a- If wires are damaged, replace
spark and the earth on heat
exchanger
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Checks
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
If the LWCO is in alarm, try to reset
Check the LWCO
a- If the flue gas pressure switches
a- Check the flue gas
pressure switches b- If the gas supply pressure is
b- Check the gas pressure incorrect, it must be adjusted to the
a- Check the return
sensor has the correct resistance
temperature sensor
b- Verify the pump for flow
circulation
b- Change the pump or restart it
a- If the supplied 120 V ac current
has a frequency of 60HZ +/- 2% ,
Verify the supplied 120 V ac
replace the power control board
current
b- If the frequency is out of range,
Check the supply 120 V ac
Reverse the supply voltage polarity
connection
a- If the supplied 120 V ac current
has a frequency of 60HZ +/- 2% ,
Check the frequency of the
replace the power control board
supply 120 V ac connection
b- If the frequency is out of range,
Check the earth connection
to the appliance
Replace the power control board
Solutions
them
Solutions
it.
don't work, replace them
correct pressure pressure
a- Verify that the temperature
values. If values are incorrect
sensor must be replaced.
consult electrician
consult electrician
Restore the earth connection
SSB