Troubleshooting - Bosch RC35 Installation And Service Instructions Manual

10 Troubleshooting

This fault table lists possible system faults, i.e. faults in EMS components. The heating system keeps
operating as long as possible in the event of a system fault; in other words, heating can continue.
Only use original Buderus spare parts. Losses caused by the use of parts not supplied
by Buderus are excluded from the Buderus warranty.
The fault displays are subject to the specific type of boiler used.
Abbreviations used:
SC = Service code; x = heating circuit with the number x, e.g. A23 for heating circuit 3
FC = Fault code
HCx = Heating circuit with the number x
SC FC Error display
A01 800 Outside
temperature
sensor
faulty.
A01 808 DHW
temperature
sensor 1
faulty.
A01 809 DHW
temperature
sensor 2
faulty.
Table 23 Fault table
Logamatic EMS – 6 720 801 387 (2011/05)
Effect on control
characteristics
The minimum outside
temperature is applied.
DHW heating has
stopped.
Troubleshooting
Possible cause
Temperature sensor
is incorrectly
connected or
fitted.Breakage or
short circuit in the
sensor lead.
Temperature sensor
is faulty.
Temperature sensor
is incorrectly
connected or
fitted.Breakage or
short circuit in the
sensor lead.
Temperature sensor
is faulty.
10
Remedy
B Check sensor
connection and
sensor lead.
B Check sensor
mounting.
B Compare
resistance values
with the sensor
curve.
B Check sensor
connection and
sensor lead.
B Check sensor
mounting.
B Compare
resistance values
with the sensor
curve.
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